CN103929232B - Wide-band mobile communication method and system based on multi-beam GEO satellite - Google Patents

Abstract

The present invention discloses a kind of wide-band mobile communication method based on multi-beam GEO satellite, and main method is：N between on-board equipment and earth station equipment_G+ 1 two-way feeding link realizes N using Ka frequency range spot beams_G+ 1 space division multiplexing；On-board equipment and N_TN between individual mobile subscriber terminal_BBar Double-Direction User link, based on N_BBeam satellite antenna is formed with N_BThe Cellular Networks of individual cell, and realize N in a manner of 4 cell races_B260MHz bandwidth resources are shared in/4 space division multiplexings.Invention additionally discloses a kind of wide-band mobile communication system based on multi-beam GEO satellite.N of the present invention_TAny one in individual mobile subscriber terminal all may be either an independent multimedia communication terminal, an or LAN being connected with public the Internet, distant place network address can be all accessed by the satellite link of the system, the present invention can be provided for a large amount of personnel on a variety of vehicles similar to the horizontal internet service of 4G mobile communication.

Description

Wide-band mobile communication method and system based on multi-beam GEO satellite

Technical field

The invention belongs to communication technical field, and in particular to a kind of wide-band mobile communication side based on multi-beam GEO satellite Method and system.

Background technology

Based on GEO (geostationary orbit, Geostationary Orbit english abbreviation) or LEO (Low Earth Orbit, Low Earth Orbit english abbreviation) satellite broadband cellular network GSM, have two terrestrial networks it is incomparable Unique advantage：One is its wide area seamless coverage ability, can be supported in the vehicles such as steamer, train, long-distance bus, aircraft The Internet, applications；The second is it, which route single-hop, just may span across thousands of kilometers, this is for real-time multimedia industry in the Internet, applications The quality assurance of business is highly beneficial；Therefore, various satellite cellular networks GSMs are still within flourishing it In.

However, LEO satellite broadband cellular network needs disposably one huge fund of input, so that much planning all half Give up on the way, or only rest on the empty talk stage.The existing very big progress of construction of broadband cellular network based on GEO satellite, And good application is obtained.Such as：The SPACEWAY systems in the U.S. are (referring to R J F.Fang, Broadband IP Transmission over Satellite with On-Board Processing and Switching//IEEE Global Telecommunications Conference (GLOBECOM 2011), 2011:1- 5), Japanese WINDS (Wideband Internetworking Engineering Test and Demonstration Satellite) system is (referring to R.Kuramasu, T.Araki, M.Shimada, T.Satoh, and et.al., Wideband InterNetworking Engineering Test and Demonstration Satellite(WINDS)System, Technical Report of IEICE,no.SAT 2002-60,Oct.2002,pp.31-42).But SPACEWAY and WINDS The terrestrial user station number that system can be supported all is less, and its Onboard switching substantially belongs to main line exchange, it is impossible to is supported a large amount of Small user's terminal, more it is not easy to support mobile communication；And for example：International Maritime Satellite Organization Inmarsat-4 (referring to Inmarsat Broadband Global Area Network(BGAN)System Description Manual, Revision 2.1.0, Feb.2003), small-sized movable user terminal can be supported, but can support that the user of wide-band mobile communication is total Capacity is still extremely limited, and accesses internet without solving the problems, such as to use well；Thailand's IPSTAR systems (referring to W.Thesling,M.Vanderaar,M.Thompson,et al.,Two-way Internet over iPSTAR using advanced error correction and dynamic links//AIAA Int.Conf.on Comm.Satellite System, Montreal, Canada.2002), using the transparent forwarding system of bent-tube boiler, there is no any exchange and road on satellite By equipment, this make it that its message capacity (45Gbps) and user capacity (100,000 on subscriber channel number) are all unprecedented huge, but because Its all exchange and route are all completed by ground juncture station, and this causes it excessively to rely on ground network, and is unfavorable for protecting Demonstrate,prove the quality of real-time broadband multimedia service；In addition with WGS (the Wide Broadband Global Satellite in the U.S. System) system (referring to WGS System Specification, rev.C, 4/30/2003), No. XX-2 of China military defend Star communication system etc..

Multibeam satellite antenna technology is to support wide-band mobile communication to open road, a GEO satellite based on GEO satellite Can supports more than 10Gbps message capacity, supports thousands of individual mobile subscribers to carry out broadband connections.However, development base Mainly there are two key issues in the wide-band mobile communication system of GEO satellite：First, how to realize very on the star of large user's capacity Signal transacting and Onboard switching；Second, the problem of how supporting internet service.If on very more users on star Row signal carries out branch, demodulation, decoding, while the information to issuing all users and is encoded, modulated and combining, its equipment are answered Miscellaneous degree and power consumption are all that satellite is unaffordable, therefore typically all use non-regenerative on-board processing and corresponding Onboard switching, But this causes obstacle for support internet service again.

(Wideband Gap-filling Satellite, are changed to Wideband to the U.S. WGS built in 2005 later Global SATCOM), journey is combined using non-regenerative signal processing technology (branch of the FDMA based on FFT and combining) on star Control is exchanged, and branch, combining and exchange are only carried out on star, has avoided above-mentioned first problem and has achieved very ten-strike；WGS is The Primary communication means of global communication are realized as U.S. army, are also extended in certain principle civilian.Non-regenerative on this star Processing and programme control circut exchange system, solve the problems, such as that multi-beam satellite supports a large number of users information to be swapped on star, Compared with each user is forwarded to through satellite link again after transparent forwarding to ground central station carries out signal transacting and user exchanges, The double jump to be communicated between user terminal is changed into single-hop, can not only save the channel resource of half, and one times of biography can be shortened Defeated time delay, this is a very rare big advantage for supporting broadband real-time video traffic.

But programme control circut exchange can not realize IP route switchings on star on star, this is for supporting internet application It is a serious obstacle.In order to solve this problem, WGS uses DVB-S2/RCS (Digital Video recently Bcasting-S2/Return Channel via Satellite) international standard protocol, form one kind and be similar to conventional satellite The MF-TDMA systems that Transparent Transponder is supported are (referring to Gibbons, et all, Link Analysis of Commercial and Wideband Gapfiller Satellite(WGS)Systems Using DVB-S2with variable Coding And Modulation (VCM), Milcon.2006paper 266), subscriber signal is by satellite transparent forwarding to ground central station Carry out branch, demodulation, decoding and IP to exchange, each user is then forwarded to by satellite link again.Obviously, this system knot Structure can only partly solve the problems, such as to support internet service, that is to say, that there can only be sub-fraction frequency band to use this system, Most of frequency band is maintained as original programme-controlled exchange and supports single-hop transmission.Because if whole satellite all uses this body System, on star programme-controlled exchange just lose meaning.

In addition, it is worth mentioning at this point that the Direct-PC that Hughes Electronics releases at the end of the nineties in last century (interconnects referring to satellite Network technology, China Telecom website), it is broadcasted using conventional GEO satellite Ku wave band Transparent Transponders in a manner of IP-OVER-DVB-S Multimedia service information is sent, user terminal need only use reception antenna and a price and its cheap machine top of 40cm bores Box or PC card, it is possible to the multimedia messages that the information rate from central station is up to 40Mbps are directly received, and directly Tap into PC；PC user terminal can also be returned by terrestrial interconnection net, realize internet access.This system because User terminal cost is very low and has obtained extremely being widely applied quickly.2003, the Action Plan for Invigorating Education that China starts Also China Education and Research Network is established using this system, develops into hundreds of thousands user quickly.(referring to Li Wei,《Utilize VSAT skills Art, service remote education sector》, China Satecom applies conference, and 2006.9).Broadband can be supported to interconnect on this system principle Net application, but due to the outer interactive mode for actually returning route or passing through ground network so that a large number of users back information Pour in network center and easily cause very much congestion, so as to can not really realize two-way Internet service, thus its is main Still TV or the incoming only station of multimedia broadcasting are served.Hughes Electronics improved this system later, and terrestrial network passback is changed For returned by satellite link (referring to Li Junping, Wang Qi translate,《Reviews and prospects：In external telecommunication satellite industry senior executive's eye 2011》, satellite and network, 2012.3) so that user terminal cost significantly rises, and seriously limits its extensive use.Together When, because the satellite communication system is not associated with multibeam satellite antenna technology, its frequency resource, user capacity are all extremely limited, The competitive advantage of satellite communication can not be played at all.

The present situation for making a general survey of wideband satellite communication development can be seen that the occasion master that satellite communication has really played important function If in terms of military communication, emergency communication and maritime communication, and it still has larger potentiality not send out in terms of civilian mobile communication Shoot and, that is, include on the vehicles such as train, long-distance bus, aircraft, steamer and Emergency communication vehicle is supported more in real time Broadband the Internet applications including media business, it should have unique advantage, but not played very well so far, and this Larger market and social demand be present in aspect.

The content of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that provide a kind of method and step Simply, the convenient and good wide-band mobile communication method based on multi-beam GEO satellite of using effect is realized.The wide-band mobile communication Method can provide internet service for a large amount of personnel on a variety of vehicles and Emergency communication vehicle.

In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of broadband based on multi-beam GEO satellite Method of mobile communication, it is characterised in that：Pass through (N between on-board equipment and earth station equipment on GEO satellite_G+ 1) bar is double Communicated to feeding link bidirectional, and on-board equipment and N_TPass through N between individual mobile subscriber terminal_BBar Double-Direction User link carries out double To communication；N_G、N_TAnd N_BIt is positive integer, N_G>=2, N_B=69~200；The earth station equipment includes a network control center And N_GIndividual juncture station；The two-way feeding link includes upper line feed link and lower line feed link, (N_G+ 1) dual feed described in bar Send link to carry out data transmission using Ka frequency range spot beams, and realize (N_G+ 1) secondary space division multiplexing；The Double-Direction User link Including user uplink link and user's downlink, N_BDouble-Direction User link described in bar carries out data using user link wave beam Transmission, the user link wave beam is X band beams, Ku band beams or or Ka band beams；

The on-board equipment and N_TThe individual mobile subscriber terminal uses to be entered by the cellular network of satellite antenna Wave beam forming Row bidirectional data transfers, the cellular network uses a width of 260MHz of the band of frequency band and the frequency band is divided into 4 65MHz bandwidth Sub-band, the frequency of 4 sub-bands differs；The cellular network is divided into N altogether_BIndividual cellular cell, Mei Gesuo State cellular cell and both correspond to N_BA Double-Direction User link in Double-Direction User link described in bar, every 4 adjacent honeycombs are small Area forms a cell race, N_BThe individual cellular cell belongs to N_B/ 4 cell races, each include 4 in the cell race The cellular cell, and 4 cellular cells in each cell race are respectively adopted 4 sub-bands and carry out data Transmission, so that the frequency resource of 260MHz bandwidth realizes N_B/ 4 space division multiplexings；N_BEach use in individual user's bi-directional link Family up-link passes through the subband signal of 26 2.5MHz bandwidth of transmission of a 65MHz bandwidth, the subband signal It need to be sent to the signal of on-board equipment, the channel of 65MHz bandwidth for mobile subscriber terminal and be divided into 26 and supply 26 sons respectively The sub-band channel of band signal transmission, and each user uplink link includes 26 sub-band channels；Each subband letter Road is with T_fIn the frame period of millisecond, N is divided into per frame_sIndividual time slot carries out information transfer, wherein T_f=5~20, N_s=8~16；N_BIt is individual Every user's downlink in user's bi-directional link respectively passes through the channel transmission data of a 65MHz bandwidth；N_TIndividual institute State mobile subscriber terminal and share N_BDouble-Direction User link carries out data transmission described in bar, N_T=(N_s-1)×26×N_B；

The data transmission procedure of the user uplink link is as follows：

Step 101, signal upload：(N in each cellular cell_s- 1) × 26 a mobile subscriber terminal passes through the user Up-link sends signal in a manner of MF-TDMA, is sent to on-board equipment；Mobile subscriber terminal sends signal as IP traffic Signal；

Signal tap and processing in step 102, star：The on-board equipment in a manner of MF-TDMA to every in step 101 with (the N that family up-link is transmitted_s- 1) × 26 a subscriber signal carries out frequency division tap and the processing of time-division tap；The 1st is removed in per frame Outside the signal of individual time slot, remaining (N_s- 1) signal of individual time slot is sent into programme-controlled exchange module and carries out programme-controlled exchange；

The signal of the 1st time slot is accessed with Synchronous-Code Division Multiple Access in per frame, and after despread, demodulation decoding, is sent Enter ip router and carry out IP exchanges；

The data transmission procedure of user's downlink is as follows：

Data conversion and modulation in step 201, star：The IP numbers of mobile subscriber terminal are sent to the need of ip router output Conversion is carried out according to stream and forms the data flow of IP-over-DVB-S forms, then carries out digital modulation；

Passed under step 202, signal：Signal obtained by digital modulation in step 201 is sent by user's downlink To corresponding mobile subscriber terminal；The bandwidth of user's downlink corresponding to each cellular cell is 65MHz；

The data transmission procedure of the upper line feed link is as follows：

Step 301, signal upload：By the upper line feed link, by transmitted by the network control center or juncture station Information is sent to on-board equipment with IP-over-SDH forms；The total bandwidth of every upper line feed link is W_uMHz, W_u=65 ×N_B/[(N_G+ 1) η], wherein η is under the band efficiency and user of digital modulation mode used in the network control center or juncture station The ratio between band efficiency of digital modulation mode used in line link；

Signal is received and handled in step 302, star：The on-board equipment receive in step 301 network control center or After the signal that juncture station is transmitted, demodulation decoding is first carried out, ip router is re-fed into and carries out IP exchanges；

The data transmission procedure of the lower line feed link is as follows：

The multiple connection and modulation of multiple signals in step 401, star：The need exported to programme-controlled exchange module are sent to earth station and set The base band complex envelope signal of standby multiple users, and ip router output need be sent to earth station equipment IP traffic warp Base band complex envelope signal obtained by digital modulation, after carrying out MF-QOTDM multiple connections, then carry out multi-carrier modulation；Every described descending Feeding link is respectively modulated to N_B/(N_G+ 1) the QOTDM signals of individual carrier modulation, each QOTDM signals are by 26 2.5MHz bandwidth Base band complex envelope signal multiplexing form, and a width of 65MHz of band of each QOTDM signals, wherein each base band complex envelope signal In contain (N_s- 1) individual MF-TDMA signals；

Wherein, MF-QOTDM is that multiband QOTDM, MF-QOTDM transmission method are multiband QOTDM transmission methods, described QOTDM transmission methods are the quasi OTDM transmission side disclosed in notification number CN1845487B application for a patent for invention Method；When carrying out MF-QOTDM multiple connections, used multiplexing method is multiplexing method used in the QOTDM transmission methods；

The quasi OTDM transmitting method, including originator and receiving end, its process it is as follows：

Originator step：

1) input is first alternately adopted with the sampling rate of NFs sampling points/second to the analytic signal of this N number of continuous signal Sample, realize sample interweaving time division multiplexing, wherein 2B ＜ Fs ＜ 3B；

2) synchronization of M sampling point is inserted in the centre of the N number of plural sampling point of every frame of above-mentioned sample interweaving time division multiplexing signal And pilot frequency sequence, it is (N+M) Fs plural number sampling point sequences to obtain a sample rate；

3) quadrature amplitude modulation QAM methods are used, by above-mentioned plural sampling point sequence modulation for one with a width of (1+ α) (N+ M) Fs hertz continuous signal, wherein pulse shaped filter are designed as zero phase-shift FIR filtering according to Nyquist criteria Device, its frequency response are approximately square root raised cosine characteristic, and α is its rolloff-factor, 0 ＜ α ＜ 1；

Receiving end step：

1) with a width-frequency characteristic with originator pulse shaped filter identical channel matched filter to described " in zero Frequently complex digital signal is filtered "；

2) a kind of frame synchronization ring based on multiphase filter is used, realizes the accurate timing of frame synchronization and sampled point synchronization；

3) sample interweaving time-division tap is carried out, output sample speed is all N number of plural sampling point sequence of Fs sampling points/second；

Passed under step 402, signal and reception processing：By the lower line feed link, by multiple connection in step 401 and modulation Gained signal is sent to the corresponding network control center or juncture station；Then, carried out in the network control center or juncture station more Carrier wave demodulation and the processing of QOTDM taps, every lower line feed link carry out N_B/(N_G+ 1) individual carrier wave demodulation, each carrier wave solution Adjust result to carry out QOTDM taps again, respectively obtain 26 base band complex envelope signals；Each base band complex envelope signal carries out the time-division point again Connect, respectively obtain 8 complex baseband signals；Decoding is demodulated respectively to gained complex baseband signal again.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：N_TThe individual mobile subscriber terminal Closed-loop synchronization is carried out all in accordance with the time synchronized deviation that on-board equipment is detected, and each user uplink link is by closing Ring synchronously realizes the synchronous transfer of frame and time slot；When carrying out closed-loop synchronization, the on-board equipment detects each mobile subscriber terminal and existed The synchronous head of each frequency band and each time slot signal transmitted reaches the time synchronized deviation of on-board equipment, and the time is same Step deviation is modulated to after digital modulation signals by user's downlink transmission to corresponding mobile subscriber terminal, the shifting After dynamic user terminal receives the digital modulation signals, its transmission delay is adjusted according to the synchronism deviation value size received, Make the synchronous head for sending signal next time reach the synchronism deviation of on-board equipment to reduce, so as to realize closed-loop synchronization.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：By on described in step 301 Line feed link by the need transmitted by the network control center or juncture station be uploaded to GEO satellite signal be sent to on-board equipment it Before, the signal that need to be uploaded to GEO satellite is first divided into N_sGroup；Every group of signal is adapted for the link signal of SDH host-host protocols Form, then channel coding is carried out with 1/2 code check and is changed into 320Mbps bit stream, after be modulated into through QPSK with a width of 200MHz signal；When the signal that need to be uploaded to GEO satellite being sent into on-board equipment by the upper line feed link, N_sIt is individual The signal of 200MHz bandwidth carries out uplink in a manner of frequency division multiplexing in the channel of Ka frequency range spot beams；Institute in step 302 State on-board equipment and receive N_sAfter the signal of individual 200MHz bandwidth, branch is first carried out to received signal, demodulation is decoded, then sent Enter ip router and carry out IP exchanges.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：By under described in step 402 When line feed link carries out data transmission, carried out data transmission using MF-QOTDM transmission methods, synchronizing sequence uses pseudorandom Code and its as spreading code use, the spreading code be used for by ip router output need be sent to earth station equipment IP data expansion Frequency is simultaneously transferred to the corresponding network control center or juncture station.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：In step 102 the 1st in every frame When the signal of time slot is accessed with Synchronous-Code Division Multiple Access, using the channel competition mechanism of carrier sense, with S-CDMA-Synchronous Code Division Multiple Access Mode sends scattered IP packets, including signaling information and HTTP service notes breath；Again to the scattered IP packets Signal is de-spread, after demodulation decoding, is sent into ip router and is carried out IP exchanges, IP is delivered under corresponding user respectively after exchanging Webmaster proxy module on line link, lower line feed link or star.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：In step 102 on-board equipment with MF-TDMA modes are to every user uplink link is transmitted in step 101 (N_s- 1) × 26 a subscriber signal carries out frequency division point When connecing with time-division tap processing, first pass through quadrature frequency conversion module and be converted to received signal progress quadrature frequency conversion again Baseband signal, then frequency division tap is carried out by frequency division Demultiplexing module, then time-division tap is carried out by time-division Demultiplexing module, then send Enter programme-controlled exchange module to swap；When entering the data multiplexing of multiple signals on planet in step 401, using MF-QOTDM multiple connections Module carries out multiple connection；The N of programme-controlled exchange module described in step 102_BIndividual input port is used for time-division Demultiplexing module respectively The data output interface of output base band complex envelope signal sampling point sequence connects, (the N of programme-controlled exchange module_G+ 1) individual output port point Not with (N_G+ 1) Data Input Interface of individual MF-QOTDM multiple connections module connects；The granularity that the programme-controlled exchange module exchanges is one The sampling point sequence data of a time slot in the individual base band complex envelope signal with a width of 2.5MHz；Programme-controlled exchange module enters stroke When control exchanges, according to the exchange routing table established by the signaling information, by N_BThe sampling point sequence data that individual input port is sent into Corresponding output port is transferred to respectively；The update cycle for exchanging routing table is (N_f×T_f) millisecond, wherein N_fFor positive integer And N_f=1~20.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：Frequency division point is carried out in step 102 When connecing, the frequency division Demultiplexing module based on 32 point FFT is used to tap received signal for 26 base band complex envelope signals, then used time Demultiplexing module is divided to carry out time-division tap respectively to each base band complex envelope signal in 26 resulting base band complex envelope signals, The signal of 8 time slots is obtained after each base band complex envelope signal time-division tap, realizes the time-division tap of MF-TDMA modes.

The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that：By under described in step 402 The information content of line feed link transmission signal is IP packets, and the network control center or juncture station are received by described After the signal of lower line feed link transmission, branch, demodulation decoding, then the IP data that will wherein belong to local internet are first carried out Bag is sent into local router and carries out IP exchanges；And the IP packets that will need to pass through on-board equipment and be sent to mobile subscriber terminal, first On-board equipment is sent to by the upper line feed link, then passes through user's downlink transmission to corresponding mobile subscriber Terminal.

Meanwhile the invention also discloses a kind of wide-band mobile communication system based on multi-beam GEO satellite, its feature to exist In：Set including the on-board equipment being laid on GEO satellite, the earth station for being laid in ground and two-way communication being carried out with on-board equipment Standby and N_TThe individual relay transmission effect by on-board equipment carries out the mobile subscriber terminal of two-way communication, the earth station equipment bag Include a network control center and N_GIndividual juncture station, N_GFor positive integer and N_G≥2；

The on-board equipment includes ip router, programme-controlled exchange module, N_BIndividual data conversion module, N can be produced_BIt is individual described First multi-beam dual-mode antenna of user link wave beam, (N can be produced_G+ 1) the second multi-beam of the individual Ka frequency ranges spot beam is received Hair antenna, the first signal transmitting and receiving unit for connecting with the first multi-beam dual-mode antenna and connect with the second multi-beam dual-mode antenna Secondary signal Transmit-Receive Unit, the N that the secondary signal Transmit-Receive Unit is received_BIndividual signal is respectively through quadrature frequency conversion module, frequency Programme-controlled exchange module is sent into after dividing Demultiplexing module and time-division Demultiplexing module；The quadrature frequency conversion module, frequency division Demultiplexing module and The quantity of time-division Demultiplexing module is N_BIt is individual, N_BThe individual time-division Demultiplexing module be used for export base band complex envelope signal sampling point sequence The data output interface of the row N with programme-controlled exchange module respectively_BIndividual input port connects；(the N of the programme-controlled exchange module_G+1) Individual output port respectively with (N_G+ 1) input interface of individual MF-QOTDM multiple connections module connects, (N_G+ 1) individual MF-QOTDM multiple connections mould The output port of block respectively with (N_G+ 1) the individual secondary signal Transmit-Receive Unit connects；

N_BThe data-out port for being used to export the 1st time slot signal of the individual time-division Demultiplexing module, connects with SCDMA The data-in port for entering module connects；The signaling information output port of SCDMA AM access modules and webmaster proxy module on star Signaling information input port connects, and webmaster proxy module connects with programme-controlled exchange module on the star；

The IP packet output ports of the SCDMA AM access modules connect with ip router, network management agent mould on the star IP data inputs/output interface of block connects with ip router；(N_G+ 1) the IP data of the individual MF-QOTDM multiple connections module are defeated Inbound port connects with ip router, N_BThe IP data-in ports of the individual data conversion module connect with ip router, N_B The output port of the individual data conversion module respectively with N_BIndividual first modulation module connects, N_BIndividual first modulation module is equal Connect with the first signal transmitting and receiving unit；

The IP data output interfaces of the secondary signal Transmit-Receive Unit connect with ip router；(N_G+ 1) the individual MF- The output port of QOTDM multiple connection modules respectively with (N_G+ 1) individual second modulation module connects, (N_G+ 1) individual second modulation module Connect with secondary signal Transmit-Receive Unit.

The above-mentioned wide-band mobile communication system based on multi-beam GEO satellite, it is characterized in that：The network control center, star Upper webmaster proxy module, N_GThe network management information interface unit and N of the individual juncture station_TThe webmaster of the individual mobile subscriber terminal is held Row unit network consisting management control system, the network management control system form a star IP network, the star IP The Centroid of network is the network control center, webmaster proxy module, N on the star_GThe webmaster letter of the individual juncture station Cease interface unit and N_TThe webmaster execution unit of the individual mobile subscriber terminal is the terminal section of the star IP network Point.

The present invention has advantages below compared with prior art：

1st, use that wide-band mobile communication system is simple in construction, reasonable in design and using effect is good, its on-board equipment includes 69~200 X frequency ranges, Ku frequency ranges or or the dual-mode antenna of Ka frequency range Cellular Networks wave beams and related transceiver, 5~17 Ka frequencies The dual-mode antenna of section spot beam and related transceiver, a programme-controlled exchange module, an ip router and a network management Webmaster proxy module on the star of system；Earth station equipment includes a central station for being used for network control management and 4~16 Juncture station, tens thousand of individual wideband mobile subscriber terminals (the satellite link interface terminal for including Internet LANs) can be supported simultaneously Communicated；Mobile subscriber uses MF-TDMA and SCDMA modes to be sent with 0.4~28Mbps speed, using IP-over- DVB-S data stream formats are received with 155Mbps speed, available for occasions such as support aircraft, train, steamer, Emergency communication vehicles Include the Internet, applications including multimedia service.

2nd, use that wide-band mobile communication method and step is simple, reasonable in design and transmitting procedure is reliable, laser propagation effect is good.

3rd, the overall planning of wide-band mobile communication system is reasonable, provides limited frequency resource and GEO satellite payload Source is fully used, the wide-band mobile communication system as big as possible suitable for forming user capacity.Numbers of beams is tried one's best more more ripples IP route switchings, the access of rational multiple access in non-regenerative signal transacting and programme-controlled exchange, simple star on beam satellite antenna, star Mode (MF-TDMA+SCDMA), efficient two-way feeding link, the IP of ground juncture station is exchanged and broadband wireless core backbone The planning of the overall plans such as network administrative center tight fit, system is set fully, efficiently to utilize X frequency ranges, Ku frequency ranges or Ka frequencies Frequency resource and GEO satellite payload resource in section, extend one's service capacity and data throughput as far as possible.Such as：When with When family wave beam number is 140,260MHz bandwidth frequencies resource can space division multiplexing 35 times, reach 9.1GHz；Each wave beam 65MHz's Frequency band is divided into 26 2.5MHz subband, and 140 wave beams amount to sub-band channel number up to 3640；Each subband realizes 8 The time division multiplexing (wherein the 1st time slot is mainly used in transmitting signaling) of time slot, then the total number of users maximum that can be communicated simultaneously can To reach 7 × 26 × 140=25,480.NCC and 8 juncture station can be used, altogether the two-way feeding link branch of 9 Ka wave bands Hold whole system.

For a system of this scale, 32 point FFT of 140 80MHz work clocks frequency division tap is needed on star Module, the sub-band channel phase for amounting to 1872 2.6MHz in resource, with WGS needed for these frequency division Demultiplexing modules is realized using FPGA Than approximately the same；Because 64 point FFT frequency division Demultiplexing modules of the latter's 39 160MHz work clocks of needs, and its signal weight Structure part is also required to and an equal amount of resource in frequency division Demultiplexing module part；And the system need not carry out FDMA signal reconstructions, only The QOTDM multiple connections of 140 26 signals need to be carried out, and the MF-QOTDM multiple connections of 9 descending feed signals, such signal are answered FPGA resource needed for connecing can reduce 3~5 times than FDMA signal reconstruction.

Another satellite resource this consumption ratio the best part is that the signal of user's downlink is sent, and WGS uses FDM side Formula sends signal, and the flat power ratio in its peak is very high.Because multi beamforming radio-frequency antenna coupler can not be too complicated, it is difficult to adopt sky Between the method for power combing increase the linear dynamic range of each power tube output signal, the power tube of each 125MHz frequency bands will 48 subband signals are sent, the flat power ratio in its peak is 48, to reduce non-linear caused multicarrier intermodulation interference, have to be carried out big Amplitude power retracts, and it is very low that this results in the very big volume and weight of power tube, average emitted power very little, radio-frequency power efficiency Three serious problems.User's downlink sends multiple user signals using IP-OVER-DVB-S forms in the present invention, belongs to single Carrier (boc) modulated signals, power tube are almost not required to carry out back-off, and power efficiency can reach highest, power amplifier body no longer be present Accumulate the problem of weight is too big and mean power is too small.In a word, although the wave beam number of this programme increases to 140, and under its user The satellite resource of line link consumes reduces several times than WGS.

The complexity and resource consumption of programme control circut switching part are all far smaller than foregoing two parts, because its is slow Deposit capacity requirement and little, and congestion control mechanism is very simple, unlike ATM exchange like that complexity；Although this programme employs Two programme-controlled exchange modules, its total complexity and resource consumption ratio WGS are increased slightly, but the resource consumption of this part is still only Account for the very little ratio of total resource consumption.

In a word, the Large Copacity wide-band mobile communication system being enumerated as above, its user capacity increase several times than WGS system, Particularly the number of mobile users of the Internet, applications is supported to increase manyfold.Because except sub-band channel number is by 1876 increases It is divided into 3640 and MF-TDMA per frame outside 8 time slots, SCDMA makes the number of users of the 1st time slot of each subband increase 8 times again, Therefore open ended total number of users at most increases more than 16 times than WGS.Although the increase of its user capacity is so many, according to upper The estimation for stating complexity and resource consumption understands that it still can use the GEO satellite platform similar to WGS to realize.Pay attention to WGS Only 27 X-band wave beams are used to support mobile communication.

4th, rational multi-access mode can make the data of whole network particularly suitable for supporting a large number of users Stochastic accessing internet Throughput is high as far as possible.

The characteristics of the Internet, applications is that each user sends characteristic of the IP bags with randomness and information rate dynamic change. If as WGS, realized only with MF-TDMA by reservation distribution time slot, may cause each time slot often occur it is idle and Utilize insufficient phenomenon.This programme uses SCDMA modes, has soft capacity and the characteristic of statistic multiplexing, in ground juncture station Middle combination multiuser detection, higher data throughput and user capacity can be reached.By two kinds of MF-TDMA and SCDMA Multi-access mode is combined, and allows the dynamic range of the adjustable information rate of each user bigger.Meanwhile when can also pass through signaling Gap randomly sends scattered IP bags, and demodulation coding and simple IP are exchanged on star, improve the operational efficiency of internet.

5th, exchanged on star using rational non-regenerative signal transacting and programme control circut, it can be ensured that system can ensure business On the premise of quality, the offer ability of real-time multimedia traffic is significantly lifted.

It is similar with WGS systems, also exchanged on culminant star of the present invention using non-regenerative signal transacting and programme control circut.With based on Regenerative on-board processing is compared, and the complexity and power consumption of on-board equipment can not only be greatly lowered, and makes each bar channel all With very strong application flexibility, this advantage is similar with WGS.But as seen from the following analysis, the system is ensureing There is bigger advantage in terms of the quality of real-time multimedia traffic in internet application.

It is well known that the ground internet based on optical fiber transmission can provide video broadcasting and the video conference industry of high quality Business, but it ensures this kind of quality of service by the non-constant width of channel width and the two very big characteristics of nodal cache device. Satellite network is only come by circuit switching by reservation fixed allocation channel in the inferior position highly significant of these two aspects by contrast Ensure the quality of this business；But the channel resource of satellite is very little, it is difficult to meet this demand of so many mobile subscriber.We There are a programme-controlled exchange module and an ip router on case culminant star, wherein, programme-controlled exchange module is by user uplink link signal Recombinated after branch, be sent to the juncture station that Internet destination addresses are nearer from the ground through lower line feed link, the juncture station This destination node is sent it to again, and compared with the IPstar systematically transmission of bent-tube boiler satellite link, so transmitting will be through The nodes for crossing ground internet route greatly reduce, and greatly reduce the possibility of congestion, are easily guaranteed that real-time multimedia industry The quality of business, meanwhile, there are a variety of possible juncture station selections in Onboard switching, therefore, Onboard switching always has available route Without causing congestion.Similarly, can when accessing the real-time multimedia traffic that distant place terrestrial network node is provided for mobile subscriber To select any one juncture station nearer from source node, multimedia messages are sent on star by line feed link thereon, passed through After ip router exchanges on star, then the targeted customer is sent to by user's downlink.It so can also greatly reduce congestion, hold Easily ensure the quality of real-time multimedia traffic.In view of the real-time multimedia traffic probability of happening between two mobile subscribers compared with It is few, therefore without providing direct path on star, but it detours ground juncture station indirect communication, and quality of service also will not substantially drop It is low, simply increase and be twice satellite link time delay.

In a word, inherently by satellite link and ground network route, the two is standby each other for this wide-band mobile communication system Part, real-time more matchmaker's business that system can be not only increased substantially on the premise of quality of service is ensured provide ability, and make Obtain satellite channel resource and obtain maximally effective utilization.

6th, user's downlink uses IP-over-DVB-S standard agreements, and realization is based on time-multiplexed single-carrier modulated Mode is transmitted, and has highest power efficiency, thus can give full play to the efficiency of satellite RF power, makes mobile subscriber terminal Manufacturing cost is greatly lowered, and the multi-system modulation as 16APSK can be used to obtain very high channel efficiency and information Speed, such as reach 155.52Mbps net rate.It is the detailed demonstration of above-mentioned conclusion below：

It is well known that, multicarrier intermodulation interference phenomenon be present in amplification of the radio-frequency power amplifier for multi-band signal, because And cause many serious problems.It is that must be lost using the method for back-off to avoid or reduce the amplitude limit of signal first Very.If frequency band number is N, each subband all sends an equal amount of power, then the peak power and mean power of resultant signal The ratio between be equal to N, want to amplify this signal and occur without non-linear distortion phenomenon caused by amplitude limit, it is necessary to carry out back-off, The power tube of peak power is equal to using the rated power of 1dB compression points.This is just needed using N times of mean power size Rated power power tube is amplified, or says the back-off for needing 10LogN (dB).

It is worthless so to carry out back-off when n is large, such as N=48 is, it is necessary to which the 16.8dB that retracts, launches 10W Mean power need power tube using 480W, the volume and weight of power tube all can be too big, and the efficiency of radio-frequency power also can It is too low.Therefore back-off value has to reduce, but signal limiter just occurs after the reduction of back-off value, causes non-thread Property distortion and multicarrier intermodulation interference, this is inevitable.Such as：Shown according to theory deduction and simulation result, work as power Value is returned to move back value and be taken asWhen, power tube amplifies the qpsk modulation signal of N number of frequency band, in the case of no other ambient noises, Just the bit error rate caused by Intermodulation Interference will be more than 10^-4, equivalent to E_b/N₀=8.4dB, or signal to noise ratio are equal to 11.4dB. In other words, because multicarrier intermodulation interference makes the signal to noise ratio of RF power amplification pipe output signal just there was only 11.4dB.This means Compared with the signal to noise ratio of output signal can reach more than 30dB when single-carrier modulated linearly is amplified, because the rollback of power tube Deficiency and there may be 20dB or so snr loss.This for downlink signal to noise ratio it is pre- at last one it is quite serious Loss.

In addition, larger back-off value can not only make power tube volume and weight become big, but also radio-frequency power can be made Efficiency reduces；The efficiency of radio-frequency power amplifier can be higher than 30% when if inactivity retracts, the work(to be retracted using 5~7dB Pipe is put, its power efficiency may be reduced to 15% or so.This signal to noise ratio budget for downlink is one additional again Loss.

According to above-mentioned estimation, user's downlink uses the time-division based on IP-OVER-DVB-S standard agreements in the present invention Multiplexing single-carrier modulated mode is transmitted, and compared with WGS is using the FDMA transmission systems of 48 frequency bands, downlink can increase 20dB or so link margin.This link margin can be used for reduce mobile subscriber antenna aperture, such as by antenna aperture by 1.5 meters are reduced to 0.4 meter, because can mobile subscriber's antenna aperture reduce, are primarily limited to the signal to noise ratio budget of downlink. For X or Ku frequency ranges, " communication in moving " antenna aperture is reduced to 0.4 meter by 1.5 meters, and its manufacturing cost may reduce many Times.And the manufacturing cost of " communication in moving " antenna proportion in the manufacturing cost of whole terminal device is very big, after some time it is possible to reach 80~90%, even more greatly；Thus so reduce antenna aperture, the total manufacture of each mobile subscriber terminal can be greatly lowered Cost.

7th, using effect is good and practical value is high, can support train, aircraft, steamer and some execution are met an urgent need or special duty Communication truck on broadband internet application including real-time multimedia traffic.On star on multibeam antenna combination star at signal Reason, which forms one, has N_BIndividual honeycombed cell (cell) covering ground and its corresponding spatial domain.For the use in each cell Family, the transmission and reception of signal can be carried out on star respectively, but for reception signal, except the scattered IP including signaling information Outside bag signal, all without demodulation coding on star, and wave beam exchange is just only carried out by programme-controlled exchange module after branch, And carry out bidirectional transfer of information with NCC or each juncture stations.Therefore, wide-band mobile communication system of the present invention is based on non- The large capacity satellite communication system of regenerative on-board processing and Onboard switching.Due on star without demodulation coding and recompiling Modulation, therefore the complexity of on-board equipment, power consumption, volume and weight are all relatively reduced, can be supported with limited GEO satellite resource Message capacity and all very big communication system of number of users.During actual use, mobile subscriber terminal uses MF-TDMA and SCDMA Mode is sent with 0.4~28Mbps speed, uses IP-over-DVB-S forms to be received with 155Mbps speed, available for propping up Holding the occasions such as aircraft, train, steamer, Emergency communication vehicle includes the Internet, applications including multimedia service.

In summary, the present invention is reasonable in design, realizes that convenient and using effect is good, practical value is high, can be used to supporting more The broadband the Internet applications of the occasion including real-time multimedia traffic such as the kind vehicles, Emergency communication vehicle, moreover it is possible to be a variety of A large amount of personnel, which provide, on the vehicles is similar to the horizontal internet service of 4G mobile communication.

Below by drawings and examples, technical scheme is described in further detail.

Brief description of the drawings

Fig. 1 is the use state reference chart of wide-band mobile communication system of the present invention.

Fig. 2 is the fundamental diagram of on-board equipment of the present invention.

Fig. 3 is the on-board processing FB(flow block) in user's closed-loop synchronization loop of the present invention.

Fig. 4 is the fundamental diagram of inventive network management control system.

Description of reference numerals:

1-earth station equipment；1-1-the network control center；1-2-juncture station；

2-on-board equipment；2-1-programme-controlled exchange module；2-2-ip router；

Webmaster proxy module on 2-4-star；2-5-frequency division Demultiplexing module；2-6-time-division Demultiplexing module；

2-7-MF-QOTDM multiple connection modules；The multi-beam dual-mode antennas of 2-8-first；

The signal transmitting and receiving units of 2-9-first；2-10-quadrature frequency conversion module；

The multi-beam dual-mode antennas of 2-11-second；

2-12-secondary signal Transmit-Receive Unit；

2-13-SCDMA AM access modules；2-14-data conversion module；3-mobile subscriber terminal；

3-1-Internet users；3-2-destination host；4-1-core router；

4-2-edge router；4-3-VoIP source hosts；4-4-Data HTTP Source main frame；

4-5-FTP source hosts.

Embodiment

As shown in Figure 1 and Figure 2, a kind of wide-band mobile communication method based on multi-beam GEO satellite of the present invention, position Pass through (N between the on-board equipment 2 and earth station equipment on GEO satellite_G+ 1) the two-way feeding link bidirectional communication of bar, and on star Equipment 2 and N_TPass through N between individual mobile subscriber terminal 3_BBar Double-Direction User link carries out two-way communication；N_G、N_TAnd N_BIt is just whole Number, N_G>=2, N_B=69~200；The earth station equipment includes the network control center 1-1 and N_GIndividual juncture station 1-2.It is described Two-way feeding link includes upper line feed link and lower line feed link, (N_G+ 1) two-way feeding link described in bar is using Ka frequencies Section spot beam carries out data transmission, and realizes (N_G+ 1) secondary space division multiplexing；The Double-Direction User link includes user uplink link With user's downlink, N_BDouble-Direction User link described in bar is carried out data transmission using user link wave beam, user's chain Road wave beam is X band beams, Ku band beams or or Ka band beams.

During actual use, N_G=8~16, N_T=14352~83200., can be right according to specific needs in actual application N_GAnd N_BValue size adjust accordingly.

The on-board equipment 2 and N_TThe individual mobile subscriber terminal 3 is using the cellular network by satellite antenna Wave beam forming Bidirectional data transfers are carried out, the cellular network uses a width of 260MHz of the band of frequency band and the frequency band is divided into 4 65MHz bands Wide sub-band, the frequency of 4 sub-bands differ.The cellular network is divided into N altogether_BIndividual cellular cell, each The cellular cell both corresponds to N_BA Double-Direction User link in Double-Direction User link described in bar, every 4 adjacent honeycombs Cell forms a cell race, N_BThe individual cellular cell belongs to N_B/ 4 cell races, each include 4 in the cell race The individual cellular cell, and 4 cellular cells in each cell race are respectively adopted 4 sub-bands and enter line number According to transmission, so that the frequency resource of 260MHz bandwidth realizes N_B/ 4 space division multiplexings；N_BIt is each in individual user's bi-directional link User uplink link passes through the subband signal of 26 2.5MHz bandwidth of transmission of a 65MHz bandwidth, the subband letter Number it need to send to the signal of on-board equipment 2, the channel of 65MHz bandwidth for mobile subscriber terminal 3 and be divided into 26 and supply 26 institutes respectively The sub-band channel of subband signal transmission is stated, and each user uplink link includes 26 sub-band channels.Frame period For T_fMillisecond, N is divided into per frame_sIndividual time slot carries out information transfer, wherein T_f=5~20, N_s=8~16.N_BThe individual user is double Every user's downlink into link respectively passes through the channel transmission data of a 65MHz bandwidth；N_TThe individual mobile subscriber Terminal 3 shares N_BDouble-Direction User link carries out data transmission described in bar, N_T=(N_s-1)×26×N_B。

With reference to Fig. 2, the data transmission procedure of the user uplink link is as follows：

Step 101, signal upload：(N in each cellular cell_s- 1) × 26 a mobile subscriber terminal 3 passes through the use Family up-link sends signal in a manner of MF-TDMA, is sent to on-board equipment 2；It is IP data that mobile subscriber terminal 3, which sends signal, The signal of stream.Also, the signal that mobile subscriber terminal 3 is sent is digital modulation signals (also referred to as base band complex envelope signal).

Signal tap and processing in step 102, star：The on-board equipment 2 is in a manner of MF-TDMA to every in step 101 (the N that user uplink link is transmitted_s- 1) × 26 a subscriber signal carries out frequency division tap and the processing of time-division tap；Per in frame except the Outside the signal of 1 time slot, remaining (N_s- 1) signal of individual time slot is sent into programme-controlled exchange module 2-1 and carries out programme-controlled exchange.Its In, the subscriber signal is the signal that mobile subscriber terminal 3 is sent in step 101.

The signal of the 1st time slot is accessed with Synchronous-Code Division Multiple Access in per frame, and after despread, demodulation decoding, is sent Enter ip router 2-2 and carry out IP exchanges.The signal of the 1st time slot is de-spread on star in per frame, demodulation decodes.

The data transmission procedure of user's downlink is as follows：

Data conversion and modulation in step 201, star：Mobile subscriber terminal 3 is sent to the need of ip router 2-2 outputs IP traffic carries out conversion and forms the data flow of IP-over-DVB-S forms, then carries out digital modulation；

Passed under step 202, signal：Signal obtained by digital modulation in step 201 is sent by user's downlink To corresponding mobile subscriber terminal 3；Each the bandwidth of user's downlink corresponding to cellular cell is 65MHz。

The data transmission procedure of the upper line feed link is as follows：

Step 301, signal upload：By the upper line feed link, by network control center 1-1 or juncture station 1-2 institutes The information of transmission is sent to on-board equipment 2 with IP-over-SDH forms；The total bandwidth of every upper line feed link is W_uMHz, W_u=65 × N_B/[(N_G+ 1) η], wherein η is digital modulation mode used in network control center 1-1 or juncture station 1-2 Band efficiency and the ratio between band efficiency of digital modulation mode used in user's downlink.

Signal is received and handled in step 302, star：The on-board equipment 2 receives network control center 1- in step 301 After the signal that 1 or juncture station 1-2 is transmitted, demodulation decoding is first carried out, ip router 2-2 is re-fed into and carries out IP exchanges.

The data transmission procedure of the lower line feed link is as follows：

The multiple connection and modulation of multiple signals in step 401, star：Ground is sent to the need of programme-controlled exchange module 2-1 outputs The base band complex envelope signal of multiple users of station equipment 1, and the need of ip router 2-2 outputs are sent to earth station equipment 1 IP traffic after carrying out MF-QOTDM multiple connections, then carries out multi-carrier modulation through the base band complex envelope signal obtained by digital modulation；Often Lower line feed link is respectively modulated to N described in bar_B/(N_G+ 1) the QOTDM signals of individual carrier modulation, each QOTDM signals are by 26 The base band complex envelope signal multiplexing of 2.5MHz bandwidth forms, and a width of 65MHz of band of each QOTDM signals, wherein each base band Contain (N in complex envelope signal_s- 1) individual MF-TDMA signals.

Wherein, MF-QOTDM is that multiband QOTDM, MF-QOTDM transmission method are multiband QOTDM transmission methods, described QOTDM transmission methods are the quasi OTDM transmission side disclosed in notification number CN1845487B application for a patent for invention Method；When carrying out MF-QOTDM multiple connections, used multiplexing method is multiplexing method used in the QOTDM transmission methods.MF- According to answering employed in QOTDM transmission methods when QOTDM multiple connections refer to carrying out multiple connection and the multiple connection of multiple frequency bands respectively Connect method and carry out multiple connection.MF-TDMA signals are the subscriber signal that on-board equipment 2 is received in a manner of MF-TDMA.

The quasi OTDM transmitting method, including originator and receiving end, its process it is as follows：

Originator step：

1) input is first alternately adopted with the sampling rate of NFs sampling points/second to the analytic signal of this N number of continuous signal Sample, realize sample interweaving time division multiplexing, wherein 2B ＜ Fs ＜ 3B；

2) synchronization of M sampling point is inserted in the centre of the N number of plural sampling point of every frame of above-mentioned sample interweaving time division multiplexing signal And pilot frequency sequence, it is (N+M) Fs plural number sampling point sequences to obtain a sample rate；

3) quadrature amplitude modulation QAM methods are used, by above-mentioned plural sampling point sequence modulation for one with a width of (1+ α) (N+ M) Fs hertz continuous signal, wherein pulse shaped filter are designed as zero phase-shift FIR filtering according to Nyquist criteria Device, its frequency response are approximately square root raised cosine characteristic, and α is its rolloff-factor, 0 ＜ α ＜ 1；

Receiving end step：

1) with a width-frequency characteristic with originator pulse shaped filter identical channel matched filter to described " in zero Frequently complex digital signal is filtered "；

2) a kind of frame synchronization ring based on multiphase filter is used, realizes the accurate timing of frame synchronization and sampled point synchronization；

3) sample interweaving time-division tap is carried out, output sample speed is all N number of plural sampling point sequence of Fs sampling points/second.

When carrying out MF-QOTDM multiple connections, because each QOTDM signals are by the base band complex envelope letter of 26 2.5MHz bandwidth Number multiple connection forms, and each base band complex envelope signal that multiple connection forms QOTDM signals includes two parts base band complex envelope signal, and one The base band complex envelope signal of programme-controlled exchange module 2-1 outputs is in part, (the N that the base band complex envelope signal corresponds in every frame_s- 1) signal of individual time slot；Another part is the IP traffic of ip router 2-2 outputs obtained by after digital modulation module is modulated Base band complex envelope signal, the signal of the 1st time slot during the base band complex envelope signal corresponds to per frame.

Passed under step 402, signal and reception processing：By the lower line feed link, by multiple connection in step 401 and modulation Gained signal is sent to corresponding network control center 1-1 or juncture station 1-2；Then, in network control center 1-1 or juncture station The processing of multicarrier demodulation QOTDM taps is carried out in 1-2, every lower line feed link carries out N_B/(N_G+ 1) individual carrier wave solution Adjust, each carrier wave demodulation result carries out QOTDM taps, respectively obtains 26 base band complex envelope signals again；Each base band complex envelope letter Number time-division tap is carried out again, respectively obtain 8 complex baseband signals；Decoding is demodulated respectively to gained complex baseband signal again.

Wherein, base band complex envelope signal is the complex envelope of bandpass signal.QOTDM taps are referred to according to QOTDM transmission sides Tapping method employed in method is tapped.

In the present embodiment, the mobile subscriber terminal 3 is a kind of two-way communication terminal with satellite channel passback (Return-Channel-Satellite-Terminal, abbreviation RCST).During actual use, the mobile subscriber terminal 3 both may be used To be LAN satellite link interface terminal that a wideband multimedia terminal or one support Internet applications (i.e. the interface termination of LAN and satellite network), and comprising multiple in the LAN that is connect of the mobile subscriber terminal 3 Internet user 3-1.Also, multiple Internet user 3-1 in the LAN pass through LAN and destination host 3-2 connects.The LAN is laid in the occasions such as the various vehicles or Emergency communication vehicle.

The juncture station 1-2 includes Ka frequency ranges dual-mode antenna, the signal transmitting and receiving to connect with Ka frequency range dual-mode antennas and processing Equipment, the core router 4-1 to connect with the signal transmitting and receiving and processing equipment and pass through Internet network and core and route The edge router 4-2 that device 4-1 is communicated, the edge router 4-2 connect with multiple source hosts, and the source host is VoIP source hosts 4-3, Data HTTP Source main frame 4-4 or FTP source host 4-5.

In the present embodiment, N_TThe time synchronized deviation that the individual mobile subscriber terminal 3 is detected all in accordance with on-board equipment 2 Closed-loop synchronization is carried out, and each user uplink link realizes the synchronous transfer of frame and time slot by closed-loop synchronization.Closed During ring synchronization, the on-board equipment 2 detects synchronization of each mobile subscriber terminal 3 in each frequency band and each time slot signal transmitted Head reaches the time synchronized deviation of on-board equipment 2, and passes through after the time synchronized deviation is modulated into digital modulation signals For user's downlink transmission to corresponding mobile subscriber terminal 3, the mobile subscriber terminal 3 receives the digital modulation letter After number, its transmission delay is adjusted according to the synchronism deviation value size received, the synchronous head for sending signal next time is reached on star The synchronism deviation of equipment 2 reduces, so as to realize closed-loop synchronization.

In the present embodiment, by the upper line feed link by network control center 1-1 or juncture station 1-2 in step 301 The signal that transmitted need are uploaded to GEO satellite is sent to before on-board equipment 2, is first drawn the signal that need to be uploaded to GEO satellite It is divided into N_sGroup；Every group of signal is adapted for the link signal form of SDH host-host protocols, then carries out channel coding with 1/2 code check And be changed into 320Mbps bit stream, after through QPSK be modulated into the signal with a width of 200MHz；Pass through the upper line feed link When the signal that GEO satellite need to be uploaded to is sent into on-board equipment 2, N_sThe signal of individual 200MHz bandwidth is with frequency division multiplexing (FDM) Mode carries out uplink in the channel of Ka frequency range spot beams；On-board equipment 2 described in step 302 receives N_sIndividual 200MHz After the signal of bandwidth, branch, demodulation decoding are first carried out to received signal, ip router 2-2 is re-fed into and carries out IP exchanges.

Wherein, N_sFor positive integer and N_s=4~16.The on-board equipment 2 receives N_sThe signal of individual 200MHz bandwidth and right After received signal carries out branch, demodulation decoding, data message is recovered.

Herein, the link signal form for being adapted for SDH host-host protocols is 155.52Mbps, in the present embodiment, SDH transmission association The link signal form of view is STM1 or STM4 link signal forms.

During actual use, when being carried out data transmission in step 202 by user's downlink, it is to incite somebody to action to transmit data IP-over-DVB-S data flow through the signal that single carrier digital modulation obtains；When being modulated in step 201, using high contrast Mode processed is modulated to the IP-over-DVB-S data flows.

In the present embodiment, used high-order modulating is QPSK, OQPSK, TCM or 16APSK digital modulation side Formula.

(the N transmitted in step 102 in a manner of MF-TDMA to every user uplink link_s- 1) × 26 subscriber signal When carrying out frequency division tap with time-division tap processing, accessed in a manner of frame synchronization.N_TIndividual mobile subscriber terminal 3 is with on-board equipment 2 Synchronized on the basis of the frame synchronization clock of issue, frame period T_fMillisecond and T_f=5~20.

During actual use, when being carried out data transmission in step 402 by the lower line feed link, passed using MF-QOTDM Transmission method carries out data transmission, synchronizing sequence using pseudo noise code and its used as spreading code, the spreading code is for by IP roads The IP data that earth station equipment is sent to by the device 2-2 need exported are spread and network control center 1-1 corresponding to being transferred to or pass Mouth station 1-2.Wherein, synchronizing sequence is also referred to as synchronization and pilot frequency sequence.

In the present embodiment, when the signal of the 1st time slot is accessed with Synchronous-Code Division Multiple Access in every frame in step 102, adopt With the channel competition mechanism of carrier sense, send scattered IP packets with Synchronous-Code Division Multiple Access, including signaling information and HTTP service notes cease.The signal to the scattered IP packets is de-spread, after demodulation decoding again, is sent into ip router 2-2 carries out IP exchanges, IP delivered to respectively after exchanging corresponding to user downlink, network management agent mould on lower line feed link or star Block 2-4.Wherein, the signal of the scattered IP packets is digital modulation signals (also referred to as base band complex envelope signal).

When being carried out data transmission in step 301 by the upper line feed link, it is IP-over-DVB-S to transmit data Data flow, used data transfer mode are SDH transmission means.

In the present embodiment, in step 102 on-board equipment 2 in a manner of MF-TDMA to every user uplink link in step 101 (the N transmitted_s- 1) when × 26 a subscriber signal carries out frequency division tap with time-division tap processing, quadrature frequency conversion is first passed through Received signal is carried out quadrature frequency conversion and is converted to complex baseband signal by module 2-10, then passes through frequency division Demultiplexing module 2-5 Frequency division tap is carried out, then time-division tap is carried out by time-division Demultiplexing module 2-6, programme-controlled exchange module 2-1 is then fed into and is handed over Change；When entering the data multiplexing of multiple signals on planet in step 401, multiple connection is carried out using MF-QOTDM multiple connection modules 2-7；Step The 2-1 of programme-controlled exchange module described in 102 N_BIndividual input port wraps again with time-division Demultiplexing module 2-6 for exporting base band respectively The data output interface of network signal sampling point sequence connects, programme-controlled exchange module 2-1 (N_G+ 1) individual output port respectively with (N_G+1) Individual MF-QOTDM multiple connections module 2-7 Data Input Interface connects；The granularity that the programme-controlled exchange module 2-1 is exchanged is a band The sampling point sequence data of a time slot in a width of 2.5MHz base band complex envelope signal；Programme-controlled exchange module 2-1 enters stroke When control exchanges, according to the exchange routing table established by the signaling information, by N_BThe sampling point sequence data that individual input port is sent into Corresponding output port is transferred to respectively；The update cycle for exchanging routing table is (N_f×T_f) millisecond, wherein N_fFor positive integer And N_f=1~20.

26 subbands that on-board equipment 2 is transmitted in a manner of MF-TDMA to the user uplink link in step 102 When signal carries out multiple access access, first pass through quadrature frequency conversion module 2-10 and quadrature frequency conversion processing carried out to received signal, Frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6 is carried out again carries out frequency division tap with after time-division tap, being sent into programme-controlled exchange mould Block 2-1；When entering data multiplexing on planet in step 401, multiple connection is carried out using MF-QOTDM multiple connection modules 2-7.Institute in step 102 State programme-controlled exchange module 2-1 N_BIndividual input port is respectively with time-division Demultiplexing module 2-6 for exporting base band complex envelope signal The data output interface of sampling point sequence connects, programme-controlled exchange module 2-1 (N_G+ 1) individual output port respectively with (N_G+ 1) individual MF- QOTDM multiple connection modules 2-7 Data Input Interface connects；The granularity that the programme-controlled exchange module 2-1 is exchanged is one with a width of The sampling point sequence data of a time slot in the 2.5MHz base band complex envelope signal；Programme-controlled exchange module 2-1 carries out program control friendship When changing, according to the exchange routing table established by the signaling information by N_BThe sampling point sequence data that individual input port is sent into turns respectively Move on to corresponding output port.The update cycle for exchanging routing table is (N_f×T_f) millisecond, wherein N_fFor positive integer and N_f= 1~20.

When frequency division tap is carried out in the present embodiment, in step 102, using the frequency division Demultiplexing module based on 32 point FFT by institute Reception signal tap is 26 base band complex envelope signals, then with time-division Demultiplexing module 2-6 to 26 resulting base band complex envelopes Each base band complex envelope signal in signal carries out time-division tap respectively, is obtained after each base band complex envelope signal time-division tap The signal of 8 time slots, realize the time-division tap of MF-TDMA modes.

In the present embodiment, the information content for transmitting signal by the lower line feed link in step 402 is IP packets, After the network control center 1-1 or juncture station 1-2 receive the signal transmitted by the lower line feed link, first divided Road, demodulation decoding, then the IP packets for wherein belonging to local internet are sent into local router and carry out IP exchanges；And need to The IP packets of mobile subscriber terminal 3 are sent to by on-board equipment 2, the upper line feed link is first passed through and is sent on star and set Standby 2, then pass through user's downlink transmission to corresponding mobile subscriber terminal 3.

That is, the network control center 1-1 and N_GIndividual juncture station 1-2 signal processing is：It is first right The multiple signals that the lower line feed link transmission is come carry out branch, demodulation decoding, then by local ip router and gateway, Destination address is belonged to the IP packets of local internet, radio communication core net is sent to and carries out IP exchanges；And other are needed The IP packets of field network address are sent to by on-board equipment 2, form IP-over-SDH data flows, and by described up Link transmission is fed to star, to be sent to each mobile subscriber terminal 3 by user's downlink on star.

To sum up, because the lower line feed link passes through a width of W of a band_d26 × N of transmission_B/(N_G+ 1) it is individual The base band complex envelope signal of 2.5MHz bandwidth, with a width of W_dFrequency band be divided into N_B/(N_G+ 1) individual sub-band, thus step 401 When carrying out MF-QOTDM multiple connections, to 26 × N_B/(N_G+ 1) the individual base band complex envelope signal transmitted from frequency band carries out multiple connection respectively, And when carrying out multiple connection to each base band complex envelope signal, QOTDM is obtained after carrying out multiple connection and multiple connection using QOTDM multiplexing methods Signal；Each sub-band in the lower line feed link transmits a base band complex envelope by 26 bandwidth for 2.5MHz Signal is through the QOTDM signals obtained by QOTDM multiple connections；During actual progress multi-carrier modulation, by every lower line feed link Respectively it is modulated to N_B/(N_G+ 1) the QOTDM signals of individual carrier modulation, each QOTDM signals are answered by the base band of 26 2.5MHz bandwidth Envelope signal multiple connection forms and it is with a width of 65MHz, wherein containing (N in each base band complex envelope signal_s- 1) individual TDMA signal. Wherein, W_d=1~3GHz.MF-QOTDM multiple connections refer to carrying out N_B/(N_G+ 1) the QOTDM multiple connections of individual frequency band, MF-QOTDM taps Multiple connection is solved for MF-QOTDM.

A kind of wide-band mobile communication system based on multi-beam GEO satellite as shown in Figure 1, including it is laid in GEO satellite On on-board equipment 2, be laid in ground and with on-board equipment 2 carry out two-way communication earth station equipment and N_TIt is individual by being set on star Standby 2 relay transmission effect carries out the mobile subscriber terminal 3 of two-way communication, and the earth station equipment is included in a network control The heart 1-1 and N_GIndividual juncture station 1-2, N_GFor positive integer and N_G≥2。

The on-board equipment 2 includes ip router 2-2, programme-controlled exchange module 2-1, N_BIndividual data conversion module 2-14, energy Produce N_BFirst multi-beam dual-mode antenna 2-8 of the individual user link wave beam, (N can be produced_G+ 1) the individual Ka frequency ranges spot beam The second multi-beam dual-mode antenna 2-11, with the first multi-beam dual-mode antenna 2-8 the first signal transmitting and receiving unit 2-9 to connect and with The secondary signal Transmit-Receive Unit 2-12 that second multi-beam dual-mode antenna 2-11 connects, the secondary signal Transmit-Receive Unit 2-12 are connect The N of receipts_BIndividual signal is sent into journey after quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6 respectively Control Switching Module 2-1.The quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6 quantity are equal For N_BIt is individual, N_BThe individual time-division Demultiplexing module 2-6 data output interface point for being used to export base band complex envelope signal sampling point sequence Not with programme-controlled exchange module 2-1 N_BIndividual input port connects.(the N of the programme-controlled exchange module 2-1_G+ 1) individual output port point Not with (N_G+ 1) individual MF-QOTDM multiple connections module 2-7 input interface connects, (N_G+ 1) individual MF-QOTDM multiple connections module 2-7's is defeated Exit port respectively with (N_G+ 1) the individual secondary signal Transmit-Receive Unit 2-12 connects.

N_BThe individual time-division Demultiplexing module 2-6 be used for export the 1st time slot signal data-out port, with SCDMA AM access modules 2-13 data-in port connects；On SCDMA AM access modules 2-13 signaling information output port and star Network management agent module 2-4 signaling information input port connects, webmaster proxy module 2-4 and programme-controlled exchange module 2- on the star 1 connects.

The IP packets output port of the SCDMA AM access modules 2-13 connects with ip router (2-2), the star online Pipe proxy module 2-4 IP data inputs/output interface connects with ip router 2-2.(N_G+ 1) the individual MF-QOTDM multiple connections Module 2-7 IP data-in ports connect with ip router 2-2, N_BIndividual data conversion module 2-14 IP data are defeated Inbound port connects with ip router 2-2, N_BIndividual data conversion module 2-14 output port respectively with N_BIndividual first modulation Module 1-15 connects, N_BThe individual first modulation module 1-15 connects with the first signal transmitting and receiving unit 2-9.

The IP data output interfaces of the secondary signal Transmit-Receive Unit 2-12 connect with ip router 2-2；(N_G+ 1) individual institute State MF-QOTDM multiple connection modules 2-7 output port respectively with (N_G+ 1) individual second modulation module 1-16 connects, (N_G+ 1) it is individual described Second modulation module 1-16 connects with secondary signal Transmit-Receive Unit 2-12.

In the present embodiment, the first signal transmitting and receiving unit 2-9 and quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5, time-division Demultiplexing module 2-6, SCDMA AM access module 2-13, N_BThe individual data conversion module 2-14 and N_BIndividual described first adjusts Molding block 1-15 forms the first signal transmitting and receiving and processing unit.Secondary signal Transmit-Receive Unit 2-12, MF-QOTDM multiple connection mould Block 2-7 and (N_G+ 1) the individual second modulation module 1-16 compositions secondary signal transmitting-receiving and processing unit.

Thus, in the wide-band mobile communication system of the present invention based on multi-beam GEO satellite, the on-board equipment 2 First signal transmitting and receiving that is used in combination by the first multi-beam dual-mode antenna 2-8, with the first multi-beam dual-mode antenna 2-8 and Processing unit, the second multi-beam dual-mode antenna 2-11, with the second multi-beam dual-mode antenna 2-11 be used in combination described second Webmaster proxy module on signal transmitting and receiving and processing unit, a programme-controlled exchange module 2-1, an ip router 2-2 and a star 2-4 is formed.N is included in the earth station equipment_GIndividual juncture station 1-2 (Gateway) and a network control center 1-1 are (referred to as NCC) it is used for network control management, can at most supports N_TIndividual mobile subscriber terminal 3 is communicated simultaneously.

In the present embodiment, the frequency division Demultiplexing module 2-5 is the frequency division tap based on 32 point FFT (FFT) Module.

In the present embodiment, with reference to Fig. 4, webmaster proxy module 2-4, N on the network control center 1-1, star_GThe individual pass Mouth station 1-2 network management information interface unit and N_TThe webmaster execution unit network consisting management control of the individual mobile subscriber terminal 3 System processed, the network management control system form a star IP network, and the Centroid of the star IP network is network Control centre 1-1, webmaster proxy module 2-4, N on the star_GThe individual juncture station 1-2 network management information interface unit and N_TThe webmaster execution unit of the individual mobile subscriber terminal 3 is the terminal node of the star IP network.

During actual use, the network management control system carries out the pipe that user access control, programme-controlled exchange and IP are exchanged Science and engineering is made.Wherein, the network control center 1-1 is that the network control on ground manages the center exchanged with IP, and network control Center 1-1 processed is the Centroid of the star IP network.

The outgoing link (transmission link i.e. by Centroid to each terminal node) of the star IP network is divided into two Section：One section is realized by a part of subchannel in the upper line feed link, and another section by a part of in the lower line feed link A part of subchannel is realized in subchannel and user's downlink；To link (i.e. by each terminal node to center in it The transmission link of node) it is also classified into two sections：One section by a part of subchannel and the user uplink in the upper line feed link A part of subchannel (i.e. the 1st time slot) is realized in link, and another section is realized by a part of subchannel in the lower line feed link. Because the transmission means of the lower line feed link is MF-QOTDM transmission, its synchronizing sequence is pseudo noise code, the pseudo noise code The information that network management system is carried in a manner of DS is transmitted, without extra busy channel resource.

To sum up, N_BIn the individual user link wave beam, each user link wave beam contains the two-way use Bi-directional transmission link between family link, i.e. mobile subscriber terminal 3 and on-board equipment 2.On the user of the Double-Direction User link Line link is that the communication links of data is sent from mobile subscriber terminal 3 to on-board equipment 2, under the user of the Double-Direction User link Line link is the communication link that data are sent from on-board equipment 2 to mobile subscriber terminal 3.The on-board equipment 2 and N_TIt is individual described Mobile subscriber terminal 3 carries out bidirectional data transfers using the cellular network, and (is specifically Ku frequency ranges using X frequency ranges, Ku frequency ranges Extended frequency band) or Ka frequency ranges in 260MHz frequency range, the frequency band of the 260MHz bandwidth is divided into 4 65MHz bandwidth Frequency band, and N is formed using multibeam satellite antenna (being specifically the first multi-beam dual-mode antenna 2-8)_BIndividual cellular cell (i.e. ground Cellular cell, cell), these cellular cells are divided into N_B/ 4 cell races (cell cluster), 4 in each cell race Each frequency of use in cellular cell is different and bandwidth is all 65MHz frequency band, so that the frequency resource of 260MHz bandwidth realizes N_B/ The space division multiplexing of 4 times.

The N_BUser uplink link in Double-Direction User link described in bar, using being based on 32 point FFT (quick Fouriers on star Leaf transformation) frequency division Demultiplexing module (also referred to as frequency division demultiplexer) tap be that (signal is digital to 26 base band complex envelope signals Signal)；26 sub-band channels of every user uplink link realize multiple access using MF-TDMA (multiband-time division multiple acess) mode Access, with T_fMillisecond is the frame period, and 8~16 time slots are divided into per frame；In addition to the 1st time slot, remaining time slot is all according to letter Make information distribute to different user send TDMA signal, and the signal of these time slots on star without demodulation coding, but It is forwarded to earth station equipment and is demodulated decoding again.1st time slot (is based on random competition side using carrier sense mechanism Formula), in a manner of S-CDMA-Synchronous Code Division Multiple Access (SCDMA), scattered IP packets are sent, transmitted scattered IP packets include letter Make information；The MF-CDMA signals of these time slots are de-spread on star, after demodulation decoding, obtained scattered IP packets After ip router 2-2 carries out IP exchanges, it is incorporated to corresponding user's downlink or the lower line feed link is sent out Send；Meanwhile the signaling information in scattered IP packets is sent to webmaster proxy module 2-4 on star, for Access Control and star It is upper to exchange management.The N_BUser's downlink in Double-Direction User link described in bar, by the channel of a 65MHz bandwidth with IP-over-DVB-S data stream transmitting broadband IP data messages, wherein DVB are Digital Video Broadcast English Abbreviation.

Carrier sense mechanism is used due to the 1st time slot and carries out data transmission in a manner of S-CDMA-Synchronous Code Division Multiple Access (SCDMA), And for the random transmission of IP packets, to accelerate the direct access of internet；So-called carrier sense herein is using described The synchronous error information of each mobile subscriber terminal 3 is sent in user's downlink, to judge channel idle situation.At the 1st The CDMA signals of gap are de-spread on star, demodulation decoding, are obtained scattered IP packets, are entered through ip router 2-2 on star After row IP is exchanged, it is incorporated to corresponding user's downlink or the lower line feed link is sent.Due to using MF-TDMA and Two kinds of access modes of SCDMA, make the speed that mobile subscriber terminal 3 sends information that there is very big variable dynamic range, can Flexibly selected from more than ten Kbps to tens Mbps, this is for supporting that the Internet, applications are highly beneficial.

In actual use, due to N_BThe signal that all mobile subscriber terminals 3 are sent in the individual user link wave beam, On star after advanced line frequency branch, the base band complex envelope signal that 26 bandwidth are all 2.5MHz is respectively obtained, and when completing After tap, it is sent to programme-controlled exchange module 2-1 and swaps, afterwards from programme-controlled exchange module 2-1 (N_G+ 1) individual output port (N is sent to respectively_G+ 1) input interface of the individual lower line feed link, then carried out by MF-QOTDM transmission methods；Every institute It is by bandwidth W to state lower line feed link_dFrequency range (W_d=1~3GHz) it is divided into N_B/(N_G+ 1) individual frequency band, Mei Gepin With transmission one by 26 bandwidth all for 2.5MHz base band complex envelope signal through the signal obtained by QOTDM multiple connections；Every institute State lower line feed link and respectively transmit 26N_B/(N_G+ 1) individual bandwidth is all 2.5MHz base band complex envelope signal, (N_G+ 1) under described in bar Line feed link transmits 26N altogether_BIndividual bandwidth is all 2.5MHz base band complex envelope signal, that is, contains all mobile subscriber terminals Information transmitted by 3.

During actual use, frame synchronization of the wide-band mobile communication system to be issued on star entirely based on multi-beam GEO satellite On the basis of clock, worked in a manner of frame synchronization and slot synchronization, each mobile subscriber terminal 3 is by detection on star and issues same Step control information (i.e. time synchronism deviation value) realizes closed-loop synchronization.With reference to Fig. 3, pass through N_BThe individual time-division Demultiplexing module 2-6 To N_BAfter user uplink link described in bar transmits signal progress time-division tap, the synchronization of sliding correlation method detection signal is first passed through Head, and error estimation is synchronized according to the synchronised clock (i.e. described frame synchronization clock) under present case, and determine each movement User terminal 3 each frequency band and each time slot pass through signal sent in the user uplink link synchronous head reach on star when Between synchronism deviation value, and this time synchronism deviation value is modulated to digital modulation signals, and be packaged into IP bags (acquisition will be detected Time synchronized deviation information is packaged into IP bags), then after ip router 2-2 carries out IP exchanges, by under the corresponding user Line link is sent to each mobile subscriber terminal 3, and each mobile subscriber terminal 3 correspondingly adjusts it after receiving the time synchronized deviation Transmission delay, the synchronous head for sending signal next time is reached the time synchronized deviation on star and reduce, so as to realize closed-loop synchronization.

(the N_G+ 1) individual Ka frequency ranges spot beam forms the two-way feeding link between earth station equipment and on-board equipment 2, With (N_G+ 1) secondary space division multiplexing mode shared frequencies resource.Wherein, (N_G+ 1) lower line feed link all uses same width described in bar Spend for W_dFrequency band, W_d=65 × 1.25 × N_B/(N_G+1)MHz；Every lower line feed link is using multiband-standard just Time division multiplexing (MF-QOTDM) mode is handed over to transmit N_dIndividual bandwidth is all 2.5MHz base band complex envelope signal, N_d=26N_B/(N_G+ 1), wherein containing the information transmitted by all mobile subscriber terminals 3.(N_G+ 1) upper line feed link described in bar is all using same Individual width is W_uFrequency band, wherein W_u=65 × N_B/(N_G+1)MHz；For will need to be sent to the institute of each mobile subscriber terminal 3 There is data message to be all fed on star, upper line feed link all uses SDH (Synchronous Digital described in each bar Hierarchy) agreement, 65 × N is transmitted_B/(N_G+ 1) data flow of MHz bandwidth.

(N_G+ 1) two-way feeding link described in bar all uses Ka frequency range spot beams, with (N_G+ 1) secondary space division multiplexing mode is shared Frequency resource.Wherein, (N_G+ 1) lower line feed link all uses same width as W described in bar_dMHz frequency band, W_d=65 × 1.25 ×N_B/(N_G+ 1) factor 1.25, is multiplied to consider some overheads needed during multiplexing transmission.Every lower line feed Link is all using MF-QOTDM (multiband-quasi OTDM) mode (referring to Granted publication filed in 11 days July in 2005 Number for CN1845487B《Quasi OTDM transmitting method》Transmission method disclosed in application for a patent for invention, inventor For Yi Kechu, Wang Yong, Yi Hongfeng, Dong Hua and field red heart), respectively transmit 26N_B/(N_G+ 1) the individual base band complex envelope with a width of 2.5MHz Signal, and (N_G+ 1) lower line feed link transmits 26 × N altogether described in bar_BIndividual base band complex envelope signal；The base of these 2.5MHz bandwidth Band complex envelope signal be sent on star by the user uplink link and tapped through frequency division, weight after time-division tap and programme-controlled exchange Signal obtained by after Combination nova, the signal are handled on star without further, but are passed through the lower line feed link and turned Earth station equipment is dealt into process again.

(N_G+ 1) upper line feed link all uses same width as W described in bar_uFrequency band, W_u=65 × N_B/(N_G+1) MHz, for all data messages for needing to be sent to each mobile subscriber terminal 3 to be all fed into star.Up feedback described in each bar Send link all using SDH (Synchronous Digital Hierarchy) agreement (referring to CCITT Recommendation G.707,“Synchronous Digital Hierarchy Bit Rates”,Recommendation G.709” Synchronous Multiplexing Structure ", Blue Book, vol.3, Fascicle 3.4, Nov.1988), pass It is defeated that respectively there is W_u=65 × N_B/[(N_G+ 1) η] bandwidth data flow.

The earth station equipment is demodulated to its received signal, decodes and IP route switchings.Due to the up feedback Send link transmission is multichannel data information, thus using the SDH agreements commonly used in microwave telecommunication, with time division multiplexing, single carrier Digital modulation mode is transmitted.Because the earth station equipment need to send signal in a manner of IP-over-SDH through described up Feed link transmission.Carry out branch to it again on star and IP is exchanged, and be packaged into N_BIndividual IP-over-DVB-S data flows and The digital modulation signals of 65MHz bandwidth are modulated to, then through user's downlink transmission.

The programme-controlled exchange module 2-1 is programme-controlled exchange circuit module on star, and the module has N_BIndividual input port, respectively It is connected to N_BThe base band complex envelope signal sampling point sequence of first signal transmitting and receiving described in user uplink link described in bar and processing unit The data output interface of row；Programme-controlled exchange module 2-1 (N_G+ 1) individual output port, is connected respectively to (N_G+ 1) individual MF-QOTDM Multiple connection module 2-7 Data Input Interface.The granularity that the programme-controlled exchange module 2-1 is exchanged is a base with a width of 2.5MHz Sampling point sequence data with a time slot in complex envelope signal.The programme-controlled exchange module 2-1 establishes according to according to signaling information Exchange routing table, the sampling point sequence data that programme-controlled exchange module 2-1 each input port is sent into, be transferred to corresponding output Port.

In actual use, the effect of the programme-controlled exchange module 2-1 is：By N on star_BIndividual first multi-beam is received The signal that hair antenna 2-8 is received, resulting sampling point sequence is reconfigured after frequency division tap and time-division tap, with Just (N is passed through after carrying out MF-QOTDM multiple connections_G+ 1) lower line feed link is fed to earth station equipment described in bar.

The input port of the ip router 2-2 is connected to the IP data outputs of first signal transmitting and receiving and processing unit Webmaster proxy module 2-4 sends IP data output interfaces and secondary signal transmitting-receiving and the processing of network management information on interface, star The IP data output interfaces of unit；The output port of the ip router 2-2 is connected to first signal transmitting and receiving and processing is single The IP Data Input Interfaces of member, webmaster proxy module 2-4 receives the IP Data Input Interfaces and described second of network management information on star The IP Data Input Interfaces of signal transmitting and receiving and processing unit.

That is, the IP data of the ip router 2-2 only have two sources：First, to by the user on star The scattered IP bags that a time slot of each subband is de-spread in the signal of line link transmission, demodulation decoding is resulting, including The IP bags that signaling information and user carry out web page browsing click and randomly generated；Second, by earth station equipment through the upper line feed Link is sent to the IP traffic of the IP-over-SDH on star.The ip router 2-2 is right according to its by these IP data Whereabouts (according to the destination address of IP bags), is transferred to interface on corresponding star, and specific corresponding ip router 2-2 output port connects Connect port.

During actual use, after ip router 2-2 carries out IP exchanges, those carry the IP packets of signaling information, are sent to Webmaster proxy module 2-4 or network control center 1-1 or juncture station 1-2 is sent to by lower line feed link described in each bar on star Control and manage for network.For that need to send to the user profile IP bags of mobile subscriber terminal 3, including the scattered IP obtained on star Wrap and be network controlled the IP that center 1-1 or juncture station 1-2 are sent to the IP-over-SDH on star through the upper line feed link Data flow, then the input data interface of user's downlink described in each bar is sent to, is packaged into IP-over-DVB-S formatted datas Stream, be modulated to 16APSK signals send (referring to Yi Kechu, Sun Yongjun,《Digital communication theory and system》Electronic Industry Press 2013.10)。

To sum up, the wide-band mobile communication system of the present invention based on multi-beam GEO satellite, utilizes multi-beam satellite day Line (i.e. the first multi-beam dual-mode antenna 2-8 and the second multi-beam dual-mode antenna 2-11) realizes the space division multiplexing of frequency resource, makes Wide-band mobile communication system can be selected suitable for the X frequency ranges of mobile communication, Ku frequency ranges or or Ka frequency ranges, there is enough frequencies to provide The satellite communication network of a Large Copacity is supported in source.Wherein, the Double-Direction User link using X frequency ranges, Ku extended frequency bands or or 260MHz frequency range in Ka frequency ranges, it is divided into the frequency band of 4 65MHz bandwidth；N is formed using multibeam satellite antenna_BIt is individual Terrestrial cellular cell (cell), these terrestrial cellular cells are divided into N_B/ 4 cell races (cell cluster), each cell Each frequency of use of 4 terrestrial cellular cells in race is different and bandwidth is all 65MHz frequency band, so that the frequency of 260MHz bandwidth Rate resource realizes N_BThe space division multiplexing of/4 times；Work as N_BWhen=200, total available frequency resources are 13GHz.

In the present embodiment, N_B=140, N_G=8, the user link wave beam is Ku band beams., can root during actual use Needed according to specific, to N_BAnd N_GValue size adjust accordingly.The GEO satellite is multi-beam GEO satellite.Institute of the present invention The wide-band mobile communication system based on multi-beam GEO satellite stated can at most support that 25480 Ku frequency range mobile subscriber terminals are same Shi Jinhang communicates, wherein 26 × 7 × 140=25,480.

In the present embodiment, the Ku frequency ranges of the on-board equipment 2 including 140 wave beams transmit/receive antenna and its it is corresponding receive/ Send signal processing module (i.e. described first signal transmitting and receiving and processing unit), the frequency range of 9 Ka wave beams transmits/receives antenna and its phase The reception answered/transmission signal processing module (i.e. described secondary signal transmitting-receiving and processing unit), 1 programme-controlled exchange module 2-1, one Webmaster proxy module 2-4 on individual ip router 2-2 and a star.

The network control center 1-1 and each juncture station 1-2 has IP exchanges and routing function.The juncture station 1-2 By national broadband wireless core backbone, the network management center in each department is connected with public internet, makes all mobile subscribers Access internet at a distance any network address when, can by programme-controlled exchange module 2-1 select a most suitable juncture station 1-2 and its Two-way feeding link, then conducted interviews by juncture station 1-2 through ground network route.Specific embodiment is as follows：

Firstth, the frequency planning of mobile subscriber's link and performance evaluation：

The Double-Direction User link uses the frequency range of 260MHz in Ku extended frequency bands, is divided into 4 65MHz bandwidth Frequency band；140 cellular cells are formed using multibeam satellite antenna, these cellular cells are further subdivided into 140/4=35 small Race of area, 4 cellular cells in each cell race respectively use the frequency band of different 65MHz bandwidth, so that 260MHz bandwidth Frequency resource can realize 35 times of space division multiplexing, and total resources are up to 9.1GHz.

1.1st, user uplink link：In the Ku frequency range user uplink links of 140 wave beams, each wave beam passes through one The subband signal of 26 2.5MHz bandwidth of transmission of 65MHz bandwidth, this 26 sub-band channels using MF-TDMA (multiband- Time division multiple acess) mode realize multiple access access, with 10 milliseconds of (i.e. T_f=10) it is the frame period, 8 time slots is divided into per frame, according to letter Each time slot is distributed to different user transmission information by order.The 1st time slot uses SCDMA (slot synchronization codes in each sub-band channel Point multiple access) mode realizes that multiple access accesses, for transmitting signaling information and scattered IP bags；The signal of these time slots is solved on star Expand, IP exchanges are carried out after demodulation decoding, wherein signaling information is used for the control management of Onboard switching, and scattered IP bags are directly sent To corresponding user's downlink transmission.

Each mobile subscriber terminal 3 applies for distribution channel by signaling to network center, when can apply for multiple TDMA simultaneously Gap, to send the signal of higher information rate, such as when applying for 7 time slots into some subband, then the information sent is fast Rate is up to 2.8Mbps or so.It is higher that each mobile subscriber terminal 3 can also apply for that the sub-band channel of multiple 2.5MHz bandwidth is sent The information of speed, such as：Apply for 10 sub-band channels simultaneously, then the information rate sent is up to 28Mbps or so.

1.2nd, user's downlink：In Ku frequency range user's downlinks of 140 wave beams, each wave beam passes through one For the channel of 65MHz bandwidth with IP-over-DVB-S format transmission broadband IP data messages, this is a kind of single carrier digital modulation Transmission means, using 16-APSK and user's downlink of the Error Correction of Coding, then every 65MHz bandwidth of 3/4 code check of combination The net information rate that can be transmitted can reach 155.52Mbps, and corresponding hair speed is 200Mbps or so.

1.3rd, data throughput is estimated：Because above-mentioned mobile subscriber's link analysis situation is understood, user's downlink Speed it is much higher with the speed than its user uplink link, the ratio between the two speed can reach (5~389) ︰ 1 or so, here 155.52/0.4 the ≈ 5 of ≈ 389,155.52/28.Such asymmetrical design, for supporting that interconnecting application is very rational.It is real On border, it is implied for television broadcasting, the support of demand (telecommunication) service.

Secondth, the method for synchronization：Wide-band mobile communication system entirely based on multi-beam GEO satellite is same with the frame issued on star On the basis of walking clock, using the frame period as T_f=10 milliseconds of frame synchronization mode works, and each mobile subscriber terminal 3 on star by examining The synchronous error information realization closed-loop synchronization surveyed and issued.26 sub-band channels of 140 user link wave beams use MF-TDMA Or SCDMA modes realize that multiple access accesses, and the synchronous transfer of frame and time slot is all realized using closed-loop synchronization mode, i.e., detected on star each Individual user reaches the time synchronized deviation on star in the synchronous head transmitted by each frequency band, each time slot, and by these synchronizations Deviation data is modulated to digital modulation signals, (need not directly be passed through in network control by corresponding user's downlink Heart 1-1 or juncture station 1-2 is sent to each mobile subscriber terminal 3.The mobile subscriber terminal 3 adjusts after receiving synchronous error value Its transmission delay, the synchronous error that the synchronous head signal for making to send next time is reached on star reduces, so as to realize closed-loop synchronization.

3rd, the frequency rule of the two-way feeding link between satellite equipment 2 and network control center 1-1 or juncture station 1-2 Draw and performance evaluation：

Because up-link is different with total speed of downlink in Double-Direction User link, satellite equipment 2 controls with network The speed of the uplink and downlink of center 1-1 or juncture station 1-2 9 two-way feeding links is different, and transmission means is also different.

3.1st, the frequency planning and performance characteristics of lower line feed link：

9 lower line feed links are, it is necessary to which the base band that all users that total bandwidth is 9.1GHz are sent to signal is wrapped again Network signal has certain expense, every chain by being fed to network control center 1-1 or juncture station 1-2 on star in view of channel multiplexing Lu Yuexu 1.25GHz frequency resource.9 space division multiplexings can be carried out using Ka frequency ranges spot beam transmission, therefore need to only be accounted for altogether With 1.25GHz frequency resource.Lower line feed link is all transmitted using MF-QOTDM transmission methods described in each bar, will 1.25GHz total bandwidth is divided into 16 wide frequency bands, and each frequency band transmission one is by 26 base band complex envelope signal multiplexings The QOTDM signals formed.

The lower line feed link transmits the synchronizing sequence in QOTDM signals, and use can carry the pseudo noise code of information Sequence, i.e., network management information is carried in a manner of DSSS and be transmitted, also it can be doubled as network management star IP network Return link use.

3.2nd, the frequency planning and performance characteristics of upper line feed link：

All modulated in view of the bandwidth mobile subscriber link of 140 user link wave beams using 16APSK, every institute The hair speed about 200Mbps that the 65MHz bandwidth of user uplink link can be transmitted is stated, 140 user uplink links amount to Hair speed is 28Gbps.Therefore the total speed fed needed for 9 upper line feed links of these data is about 28Gbps, if Using QPSK modulation transmissions, then required bandwidth is about 18GHz.9 times of space division multiplexings are considered as, then required frequency resource is about 2GHz；Allow some leeway, be taken as 2.25GHz bandwidth.

Modulated using QPSK, the hair speed of every upper line feed link transmission 2.25GHz bandwidth is about 3.375Gbps；Encoded according to the channel error correction of 3/4 code check, then net rate is 2.53125Gbps.Using the frequency division of 4 frequency bands Multiplexing transmission, each frequency band is according to the STM4 format transmissions of SDH agreements, i.e. speed 622.08Mbps, then total speed is 2.48832Mbps, it is clear that 2.25GHz bandwidth can meet the requirement of this transmission.

The data transmitted in the upper line feed link are based on IP-over-SDH modes, are used for network pipe wherein can include The IP packets of reason.That is, this link can provide part letter for the star IP network of support network management control system Cease transmission channel.

In the present embodiment, the update cycle of the exchange routing table of the programme-controlled exchange module 2-1, frame period T is taken as_f5 Times, i.e., 50 milliseconds.

During actual use, the update cycle for exchanging routing table can be adjusted accordingly according to specific needs.

It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention Any simple modification, change and the equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention In the protection domain of art scheme.

Claims (10)

1. A kind of 1. wide-band mobile communication method based on multi-beam GEO satellite, it is characterised in that：On the star on GEO satellite Equipment (2) passes through (N between earth station equipment_G+ 1) the two-way feeding link bidirectional communication of bar, and on-board equipment (2) and N_TIndividual shifting Pass through N between dynamic user terminal (3)_BBar Double-Direction User link carries out two-way communication；N_G、N_TAnd N_BIt is positive integer, N_G>=2, N_B =69~200；The earth station equipment includes a network control center (1-1) and N_GIndividual juncture station (1-2)；The dual feed Link is sent to include upper line feed link and lower line feed link, (N_G+ 1) two-way feeding link described in bar uses Ka frequency ranges point ripple Beam carries out data transmission, and realizes (N_G+ 1) secondary space division multiplexing；The Double-Direction User link includes user uplink link and user Downlink, N_BDouble-Direction User link described in bar is carried out data transmission using user link wave beam, the user link wave beam For X band beams, Ku band beams or Ka band beams；

   The on-board equipment (2) and N_TThe individual mobile subscriber terminal (3) uses to be entered by the cellular network of satellite antenna Wave beam forming Row bidirectional data transfers, the cellular network uses a width of 260MHz of the band of frequency band and the frequency band is divided into 4 65MHz bandwidth Sub-band, the frequency of 4 sub-bands differs；The cellular network is divided into N altogether_BIndividual cellular cell, Mei Gesuo State cellular cell and both correspond to N_BA Double-Direction User link in Double-Direction User link described in bar, every 4 adjacent honeycombs are small Area forms a cell race, N_BThe individual cellular cell belongs to N_B/ 4 cell races, each include 4 in the cell race The cellular cell, and 4 cellular cells in each cell race are respectively adopted 4 sub-bands and carry out data Transmission, so that the frequency resource of 260MHz bandwidth realizes N_B/ 4 space division multiplexings；N_BEach use in individual user's bi-directional link Family up-link passes through the subband signal of 26 2.5MHz bandwidth of transmission of a 65MHz bandwidth, the subband signal It need to be sent to the signal of on-board equipment (2), the channel of 65MHz bandwidth for mobile subscriber terminal (3) and be divided into 26 and supply 26 respectively The sub-band channel of the subband signal transmission, and each user uplink link includes 26 sub-band channels；Each Sub-band channel is with T_fIn the frame period of millisecond, N is divided into per frame_sIndividual time slot carries out information transfer, wherein T_f=5~20, N_s=8~ 16；N_BEvery user's downlink in individual user's bi-directional link respectively passes through the channel transmission data of a 65MHz bandwidth； N_TThe individual mobile subscriber terminal (3) shares N_BDouble-Direction User link carries out data transmission described in bar, N_T=(N_s-1)×26×N_B；

   The data transmission procedure of the user uplink link is as follows：

   Step 101, signal upload：(N in each cellular cell_s- 1) × 26 a mobile subscriber terminal (3) passes through on the user Line link sends signal in a manner of MF-TDMA, is sent to on-board equipment (2)；It is IP data that mobile subscriber terminal (3), which sends signal, The signal of stream；

   Signal tap and processing in step 102, star：The on-board equipment (2) in a manner of MF-TDMA to every in step 101 with (the N that family up-link is transmitted_s- 1) × 26 a subscriber signal carries out frequency division tap and the processing of time-division tap；The 1st is removed in per frame Outside the signal of individual time slot, remaining (N_s- 1) signal of individual time slot is sent into programme-controlled exchange module (2-1) and carries out programme-controlled exchange；

   The signal of the 1st time slot is accessed with Synchronous-Code Division Multiple Access in per frame, and after despread, demodulation decoding, is sent into IP Router (2-2) carries out IP exchanges；

   The data transmission procedure of user's downlink is as follows：

   Data conversion and modulation in step 201, star：Mobile subscriber terminal (3) is sent to the need of ip router (2-2) output IP traffic carries out conversion and forms the data flow of IP-over-DVB-S forms, then carries out digital modulation；

   Passed under step 202, signal：Signal obtained by digital modulation in step 201 is sent to right by user's downlink The mobile subscriber terminal (3) answered；The bandwidth of user's downlink corresponding to each cellular cell is 65MHz；

   The data transmission procedure of the upper line feed link is as follows：

   Step 301, signal upload：By the upper line feed link, by the network control center (1-1) or juncture station (1-2) institute The information of transmission is sent to on-board equipment (2) with IP-over-SDH forms；The total bandwidth of every upper line feed link is W_uMHz, W_u=65 × N_B/[(N_G+ 1) η], wherein η is digital modulation side used in the network control center (1-1) or juncture station (1-2) The band efficiency of formula and the ratio between band efficiency of digital modulation mode used in user's downlink；

   Signal is received and handled in step 302, star：The on-board equipment (2) receives the network control center (1- in step 301 1) or after the signal that is transmitted of juncture station (1-2), demodulation decoding is first carried out, ip router (2-2) is re-fed into and carries out IP exchanges；

   The data transmission procedure of the lower line feed link is as follows：

   The multiple connection and modulation of multiple signals in step 401, star：Earth station is sent to the need of programme-controlled exchange module (2-1) output The base band complex envelope signal of multiple users of equipment (1), and the need of ip router (2-2) output are sent to earth station equipment (1) IP traffic after carrying out MF-QOTDM multiple connections, then carries out multicarrier tune through the base band complex envelope signal obtained by digital modulation System；Every the lower line feed link is modulated to N_B/(N_G+ 1) the QOTDM signals of individual carrier modulation, each QOTDM signals are equal Formed by the base band complex envelope signal multiplexing of 26 2.5MHz bandwidth, and a width of 65MHz of band of each QOTDM signals, wherein often Contain (N in individual base band complex envelope signal_s- 1) individual MF-TDMA signals；

   Wherein, MF-QOTDM is that multiband QOTDM, MF-QOTDM transmission method are multiband QOTDM transmission methods；Carry out MF- During QOTDM multiple connections, used multiplexing method is multiplexing method used in the QOTDM transmission methods；

   The QOTDM transmission methods, including originator and receiving end, its process it is as follows：

   Originator step：

   1) input is first alternately sampled with the sampling rate of NFs sampling points/second to the analytic signal of this N number of continuous signal, real Existing sample interweaving time division multiplexing, wherein 2B ＜ Fs ＜ 3B；

   2) above-mentioned sample interweaving time division multiplexing signal the N number of plural sampling point of every frame among insert the synchronization of M sampling point and lead Frequency sequence, it is (N+M) Fs plural number sampling point sequences to obtain a sample rate；

   3) quadrature amplitude modulation QAM methods are used, by above-mentioned plural sampling point sequence modulation for one with a width of (1+ α) (N+M) Fs Hertz continuous signal, wherein pulse shaped filter are designed as zero phase-shift FIR filter according to Nyquist criteria, its frequency Rate response is approximately square root raised cosine characteristic, and α is its rolloff-factor, 0 ＜ α ＜ 1；

   Receiving end step：

   1) signal received is carried out quadrature frequency conversion by receiving end, and is obtained " zero intermediate frequency " using phaselocked loop correcting frequency offset and skew After complex digital signal, with a width-frequency characteristic with originator pulse shaped filter identical channel matched filter to described " zero Intermediate frequency " complex digital signal is filtered；

   2) a kind of frame synchronization ring based on multiphase filter is used, realizes the accurate timing of frame synchronization and sampled point synchronization；

   3) sample interweaving time-division tap is carried out, output sample speed is all N number of plural sampling point sequence of Fs sampling points/second；

   Passed under step 402, signal and reception processing：By the lower line feed link, by multiple connection in step 401 and modulation gained Signal is sent to the corresponding network control center (1-1) or juncture station (1-2)；Then, at the network control center (1-1) or critical point Standing, (1-2) is middle to carry out the processing of multicarrier demodulation QOTDM taps, and every lower line feed link carries out N_B/(N_G+ 1) individual carrier wave Demodulation, each carrier wave demodulation result carry out QOTDM taps, respectively obtain 26 base band complex envelope signals again；Each base band complex envelope Signal carries out time-division tap again, respectively obtains 8 complex baseband signals；Decoding is demodulated respectively to gained complex baseband signal again.
2. 2. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1, it is characterised in that：N_TIndividual institute State mobile subscriber terminal (3) and carry out closed-loop synchronization, and each institute all in accordance with the time synchronized deviation that on-board equipment (2) is detected State the synchronous transfer that user uplink link realizes frame and time slot by closed-loop synchronization；When carrying out closed-loop synchronization, the on-board equipment (2) detect each mobile subscriber terminal (3) and reach on-board equipment (2) in the synchronous head of each frequency band and each time slot signal transmitted Time synchronized deviation, and the time synchronized deviation is modulated to after digital modulation signals by user's downlink Corresponding mobile subscriber terminal (3) is sent to, after the mobile subscriber terminal (3) receives the digital modulation signals, according to connecing The synchronism deviation value size received adjusts its transmission delay, the synchronous head for sending signal next time is reached the same of on-board equipment (2) Walk deviation to reduce, so as to realize closed-loop synchronization.
3. 3. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterised in that：Step The need transmitted by the network control center (1-1) or juncture station (1-2) are uploaded to by the upper line feed link in rapid 301 The signal of GEO satellite is sent to before on-board equipment (2), and the signal that need to be uploaded to GEO satellite first is divided into N_sGroup；Every group of letter The link signal form of SDH host-host protocols number is adapted for, then channel coding is carried out with 1/2 code check and is changed into 320Mbps's Bit stream, after through QPSK be modulated into the signal with a width of 200MHz；GEO need to be uploaded to by the upper line feed link to defend When the signal of star is sent to on-board equipment (2), N_sThe signal of individual 200MHz bandwidth is in a manner of frequency division multiplexing in Ka frequency range spot beams Channel in carry out uplink；On-board equipment described in step 302 (2) receives N_sAfter the signal of individual 200MHz bandwidth, first Branch, demodulation decoding are carried out to received signal, ip router (2-2) is re-fed into and carries out IP exchanges.
4. 4. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterised in that：Step When being carried out data transmission in rapid 402 by the lower line feed link, carried out data transmission using MF-QOTDM transmission methods, together Step sequence is using pseudo noise code and it is as spreading code use, and the spreading code is used to need to transmit by ip router (2-2) output IP data to earth station equipment spread and are transferred to the corresponding network control center (1-1) or juncture station (1-2).
5. 5. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterised in that：Step When the signal of the 1st time slot is accessed with Synchronous-Code Division Multiple Access in every frame in rapid 102, using the channel competition machine of carrier sense System, scattered IP packets, including signaling information and HTTP service notes breath are sent with Synchronous-Code Division Multiple Access；Again to described The signal of scattered IP packets is de-spread, after demodulation decoding, is sent into ip router (2-2) and is carried out IP exchanges, IP is exchanged Webmaster proxy module (2-4) on user's downlink, lower line feed link or star corresponding to delivering to respectively afterwards.
6. 6. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 5, it is characterised in that：Step In 102 on-board equipment (2) in a manner of MF-TDMA to every user uplink link is transmitted in step 101 (N_s- 1) × 26 When subscriber signal carries out frequency division tap with time-division tap processing, quadrature frequency conversion module (2-10) is first passed through by received letter Number carrying out quadrature frequency conversion is converted to complex baseband signal, then carries out frequency division tap by frequency division Demultiplexing module (2-5), then when passing through Divide Demultiplexing module (2-6) to carry out time-division tap, be then fed into programme-controlled exchange module (2-1) and swap；Enter planet in step 401 During the multiple connection of upper multiple signals, multiple connection is carried out using MF-QOTDM multiple connections module (2-7)；Programme-controlled exchange mould described in step 102 The N of block (2-1)_BIndividual input port is respectively with time-division Demultiplexing module (2-6) for exporting base band complex envelope signal sampling point sequence Data output interface connect, (the N of programme-controlled exchange module (2-1)_G+ 1) individual output port respectively with (N_G+ 1) individual MF-QOTDM is answered The Data Input Interface of connection module (2-7) connects；The granularity that the programme-controlled exchange module (2-1) exchanges is one with a width of The sampling point sequence data of a time slot in the 2.5MHz base band complex envelope signal；Programme-controlled exchange module (2-1) carries out program control During exchange, according to the exchange routing table established by the signaling information, by N_BThe sampling point sequence data point that individual input port is sent into Corresponding output port is not transferred to；The update cycle for exchanging routing table is (N_f×T_f) millisecond, wherein N_fFor positive integer and N_f=1~20.
7. 7. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 6, it is characterised in that：Step When frequency division tap is carried out in 102, use the frequency division Demultiplexing module based on 32 point FFT to tap received signal and answered for 26 base band Envelope signal, then with time-division Demultiplexing module (2-6) to each base band complex envelope in 26 resulting base band complex envelope signals Signal carries out time-division tap respectively, and the signal of 8 time slots is obtained after each base band complex envelope signal time-division tap, is realized The time-division tap of MF-TDMA modes.
8. 8. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterised in that：Step It is IP packets to transmit the information content of signal by the lower line feed link in rapid 402, the network control center (1-1) Or after juncture station (1-2) receives the signal transmitted by the lower line feed link, branch, demodulation decoding are first carried out, then The IP packets for wherein belonging to local internet are sent into local router and carry out IP exchanges；And on-board equipment (2) need to be passed through The IP packets of mobile subscriber terminal (3) are sent to, the upper line feed link is first passed through and is sent to on-board equipment (2), then lead to User's downlink transmission is crossed to corresponding mobile subscriber terminal (3).
9. A kind of 9. system for realizing wide-band mobile communication method as claimed in claim 1, it is characterised in that：Including being laid in GEO On-board equipment (2) on satellite, the earth station equipment and N for being laid in ground and two-way communication being carried out with on-board equipment (2)_TIt is individual to borrow The relay transmission of on-board equipment (2) is helped to act on the mobile subscriber terminal (3) for carrying out two-way communication, the earth station equipment includes one The individual network control center (1-1) and N_GIndividual juncture station (1-2), N_GFor positive integer and N_G≥2；

   The on-board equipment (2) includes ip router (2-2), programme-controlled exchange module (2-1), N_BIndividual data conversion module (2-14), N can be produced_BFirst multi-beam dual-mode antenna (2-8) of the individual user link wave beam, (N can be produced_G+ 1) the individual Ka frequency ranges point Second multi-beam dual-mode antenna (2-11) of wave beam, the first signal transmitting and receiving list to connect with the first multi-beam dual-mode antenna (2-8) First (2-9) and the secondary signal Transmit-Receive Unit (2-12) to connect with the second multi-beam dual-mode antenna (2-11), the secondary signal The N that Transmit-Receive Unit (2-12) is received_BIndividual signal respectively through quadrature frequency conversion module (2-10), frequency division Demultiplexing module (2-5) and Time-division Demultiplexing module (2-6) is sent into programme-controlled exchange module (2-1) afterwards；The quadrature frequency conversion module (2-10), frequency division tap mould The quantity of block (2-5) and time-division Demultiplexing module (2-6) is N_BIt is individual, N_BThe individual time-division Demultiplexing module (2-6) be used for export base Data output interface with the complex envelope signal sampling point sequence N with programme-controlled exchange module (2-1) respectively_BIndividual input port connects； (the N of the programme-controlled exchange module (2-1)_G+ 1) individual output port respectively with (N_G+ 1) individual MF-QOTDM multiple connections module (2-7) is defeated Incoming interface connects, (N_G+ 1) output port of individual MF-QOTDM multiple connections module (2-7) respectively with (N_G+ 1) the individual secondary signal is received Bill member (2-12) connects；

   N_BThe data-out port for being used to export the 1st time slot signal of the individual time-division Demultiplexing module (2-6), connects with SCDMA The data-in port for entering module (2-13) connects；The signaling information output port of SCDMA AM access modules (2-13) is surfed the Net with star The signaling information input port of pipe proxy module (2-4) connects, webmaster proxy module (2-4) and programme-controlled exchange module on the star (2-1) connects；

   The IP packets output port of the SCDMA AM access modules (2-13) connects with ip router (2-2), webmaster on the star IP data inputs/output interface of proxy module (2-4) connects with ip router (2-2)；(N_G+ 1) the individual MF-QOTDM is answered The IP data-in ports of connection module (2-7) connect with ip router (2-2), N_BThe individual data conversion module (2-14) IP data-in ports connect with ip router (2-2), N_BThe output port difference of the individual data conversion module (2-14) With N_BIndividual first modulation module (1-15) connects, N_BIndividual first modulation module (1-15) with the first signal transmitting and receiving unit (2- 9) connect；

   The IP data output interfaces of the secondary signal Transmit-Receive Unit (2-12) connect with ip router (2-2)；(N_G+ 1) it is individual described The output port of MF-QOTDM multiple connections module (2-7) respectively with (N_G+ 1) individual second modulation module (1-16) connects, (N_G+ 1) individual institute The second modulation module (1-16) is stated with secondary signal Transmit-Receive Unit (2-12) to connect.
10. 10. according to the system described in claim 9, it is characterised in that：Network management agent on the network control center (1-1), star Module (2-4), N_GThe network management information interface unit and N of the individual juncture station (1-2)_TThe webmaster of the individual mobile subscriber terminal (3) Execution unit network consisting management control system, the network management control system form a star IP network, the star The Centroid of IP network is the network control center (1-1), webmaster proxy module (2-4), N on the star_GThe individual juncture station The network management information interface unit and N of (1-2)_TThe webmaster execution unit of the individual mobile subscriber terminal (3) is institute State the terminal node of star IP network.