CN102594423A - Multiinput-multioutput system - Google Patents
Multiinput-multioutput system Download PDFInfo
- Publication number
- CN102594423A CN102594423A CN2012100261040A CN201210026104A CN102594423A CN 102594423 A CN102594423 A CN 102594423A CN 2012100261040 A CN2012100261040 A CN 2012100261040A CN 201210026104 A CN201210026104 A CN 201210026104A CN 102594423 A CN102594423 A CN 102594423A
- Authority
- CN
- China
- Prior art keywords
- way
- signal
- uplink
- downlink
- road
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The invention provides a multiinput-multioutput system, which comprises a near end node, a remote node and an antenna, wherein the near end node and the remote node are connected by an optical fiber. The near end node is used for performing polarization and combining processes for at least two downlink optical signals, generating combined emission signals, sending the signals to the remote node in a downlink communication; and obtaining at least two uplink optical signals through performing combining and depolarization processes for combined receipt signals in an uplink communication. The remote node is used for obtaining at least two downlink optical signals through performing combining and depolarization processes for combined receipt signals, converting the downlink optical signals to corresponding radio frequency emission signals, and accomplishing downlink sending through the antenna in the downlink communication; and receiving at least two radio frequency emission signals through the antenna uplink, converting the radio frequency emission signals to corresponding uplink optical signals, performing the polarization and combining processes for at least two downlink optical signals, generating combined receipt signals, and sending the signals to the near end node in the uplink communication.
Description
Technical field
The present invention relates to signal processing technology, relate in particular to a kind of multi-input multi-output system, belong to communication technical field.
Background technology
Along with the large-scale application of Internet development and the 3rd mobile communication technology (3G) network, the user increases for the increasing demand of data service, and it is professional occurred frequently in indoor scene to investigate video data simultaneously.The main solution of indoor covering such as comprises in indoor distributed system and the outdoor base station exposure cell at scheme.Long Term Evolution (Long Term Evolution; LTE) after the introducing; The operating frequency of more existing 3G of working frequency range and 2G system is higher, and for satisfying data traffic requirement at a high speed, the depth signal covering of more building type needs to solve through indoor distributed system.
Multiple-input and multiple-output (MIMO) technology is one of important means of elevator system capacity; But MIMO indoor distributed system solution adopts framework as shown in Figure 1 to transmit mostly at present, and Fig. 1 is for having the structural representation based on the indoor distributed system of MIMO technology now.As shown in Figure 1; With the input and output that realize two paths of signals simultaneously is example; Baseband processing unit (BBU) utilizes two optical fiber to come respectively two paths of signals to be transferred to Remote Radio Unit (RRU), and each road signal that RRU utilizes coaxial cable to receive is again launched through antenna.Thus it is clear that, the mode of employing two-way transmission between BBU and the RRU.Therefore, when realizing the MIMO indoor distributed system based on this mode, needing increases a large amount of communication lines through the indoor distributed system at 2G/3G, thereby the increase system builds difficulty, and has significantly improved cost.
Summary of the invention
The present invention provides a kind of multi-input multi-output system, is used under the situation that reduces communication line, realizing the multiple signals transmission.
According to an aspect of the present invention, a kind of multi-input multi-output system is provided, comprises near-end node, distant-end node and antenna, said near-end node is connected through optical fiber with said distant-end node, wherein:
Said near-end node is used at downlink communication, and two-way downlink optical signal is at least carried out polarization and closes the road and handle, and generates to close the road and transmit and send to said distant-end node; Be used at uplink communication, carry out shunt and depolarization processing, obtain two-way uplink optical signal at least through the road reception signal that closes that said distant-end node is sent;
Said distant-end node; Be used at downlink communication; The road of closing through said near-end node is sent transmits and carries out shunt and depolarization processing; Obtain the said downlink optical signal of two-way at least, convert said downlink optical signal into corresponding radio frequency transmissions, and accomplish descending transmission through said antenna; Be used at uplink communication; Receive two-way radio frequency receiving signal at least through said antenna uplink; Convert said radio frequency receiving signal into corresponding uplink optical signal, two-way uplink optical signal is at least carried out polarization and closes the road and handle, generates the said road reception signal that closes and send to said near-end node.
According to multi-input multi-output system provided by the invention; Because near-end node is when sending the multichannel downlink optical signal; Through the multichannel downlink optical signal being carried out polarization manipulation so that the multichannel polarized light signal after the polarization manipulation is uncorrelated mutually; These mutual incoherent multichannel polarized light signals are merged processing, utilize an optical fiber that multipath light signal is sent to distant-end node simultaneously; Because the multichannel polarised light that closes in the signal of road is uncorrelated mutually,, can recover the raw baseband signal that near-end node issues so distant-end node is conciliate polarization manipulation through carrying out corresponding the processing along separate routes.It is thus clear that, utilize this multi-input multi-output system, can realize multiple-input and multiple-output based on an optical fiber, build difficulty thereby greatly reduced system, and significantly reduced construction cost.
Description of drawings
Fig. 1 is existing structural representation based on the technological indoor distributed system of MIMO;
Fig. 2 is the system architecture diagram of the multi-input multi-output system of the embodiment of the invention;
Fig. 3 is the structural representation of near-end node in the multi-input multi-output system of the embodiment of the invention;
Fig. 4 is the structural representation of distant-end node in the multi-input multi-output system of the embodiment of the invention.
Embodiment
Fig. 2 is the system architecture diagram of the multi-input multi-output system of the embodiment of the invention.As shown in Figure 2, this system comprises near-end node 21, distant-end node 22 and antenna 23, and said near-end node 21 and said distant-end node 22 are connected through optical fiber, wherein:
Said near-end node 21 is used at downlink communication, and two-way downlink optical signal is at least carried out polarization and closes the road and handle, and generates to close the road and transmit and send to said distant-end node; Be used at uplink communication, carry out shunt and depolarization processing, obtain two-way uplink optical signal at least through the road reception signal that closes that said distant-end node is sent;
Said distant-end node 22; Be used at downlink communication; The road of closing through said near-end node is sent transmits and carries out shunt and depolarization processing; Obtain the said downlink optical signal of two-way at least, convert said downlink optical signal into corresponding radio frequency transmissions, and accomplish descending transmission through said antenna 23; Be used at uplink communication; Through said antenna 23 up receptions two-way radio frequency receiving signal at least; Convert said radio frequency receiving signal into corresponding uplink optical signal; At least two-way uplink optical signal is carried out polarization and closes the road and handle, generates the said road reception signal that closes and send to said near-end node.
Particularly, near-end node for example is the BBU side, and distant-end node for example is the RRU side.Below to utilize this mimo system to realize that the downlink communication of two paths of signals is that example describes.
For example near-end node 21 needs outwards emission first downlink optical signal and second downlink optical signal, and wherein first downlink optical signal and second downlink optical signal are baseband signal, and then 21 pairs first downlink optical signals of near-end node carry out polarization manipulation; Form the first descending polarized light signal; Second downlink optical signal is carried out polarization manipulation, form the second descending polarized light signal, and the first descending polarized light signal is uncorrelated with the second descending polarized light signal; Preferably; Both polarization directions are mutually orthogonal, and for example the first descending polarized light signal is the X polarized light signal, and the second descending polarized light signal is the Y polarized light signal.Near-end node 21 for example merges processing through combiner to the first descending polarized light signal and the second descending polarized light signal that obtains, and this two paths of signals is merged into one road light signal, promptly closes the road and transmits and transmit through optical fiber.
Distant-end node 22 receives near-end node 21 and transmits through the road of closing that optical fiber sends; This is closed the road transmits and carries out shunt and handle; Transmitting with Jiang Helu reverts to the two-way polarized light signal, afterwards, and again according to carrying out depolarization and handle with the corresponding folk prescription formula of separating of the polarization mode of near-end node 21; The first descending polarized light signal is reverted to first downlink optical signal, the second descending polarized light signal is reverted to second downlink optical signal.Afterwards; Respectively first downlink optical signal and second downlink optical signal are carried out opto-electronic conversion; Obtain the first downlink electrical signal and the second downlink electrical signal, and the first downlink electrical signal and the second downlink electrical signal are carried out processing such as Digital IF Processing, digital-to-analogue conversion, up-conversion and filtering, and by being sent to antenna 23 after the radio-frequency power amplifier amplification; To be sent to user terminal, for example be portable terminal via antenna 23.
Correspondingly, the mimo system of the foregoing description also can be used for realizing the uplink communication of multiple signals, is that example describes with the uplink communication of realizing two paths of signals below.
Distant-end node 22 receives first radio frequency receiving signal and second radio frequency receiving signal that user terminal sends through antenna 23.Distant-end node 22 carries out down-conversion, low noise amplification, filtering, analog-to-digital conversion and Digital IF Processing etc. to first radio frequency receiving signal and second radio frequency receiving signal respectively, forms first uplink electrical signals corresponding with first radio frequency receiving signal and second uplink electrical signals corresponding with second radio frequency receiving signal.22 pairs first uplink optical signals of distant-end node carry out polarization manipulation; Form the first up polarized light signal; Second uplink optical signal is carried out polarization manipulation, form the second up polarized light signal, and the first up polarized light signal is uncorrelated with the second up polarized light signal.Distant-end node 22 for example merges processing through combiner to the first up polarized light signal and the second up polarized light signal that obtains, and this two paths of signals is merged into one road light signal, promptly closes road reception signal and is sent to near-end node 21 through optical fiber.
Near-end node 21 receives distant-end node 22 and receives signal through the road of closing that optical fiber sends; This is closed road reception signal carry out the shunt processing; Revert to the two-way polarized light signal will close road reception signal; Afterwards, according to carrying out the depolarization processing, the first up polarized light signal is reverted to first uplink optical signal again with the corresponding folk prescription formula of separating of the polarization mode of distant-end node 22; The second up polarized light signal is reverted to second uplink optical signal, thereby the upstream data of accomplishing user terminal to near-end node 21 sends.
Multi-input multi-output system according to the foregoing description; Because near-end node is when sending the multichannel downlink optical signal; Through the multichannel downlink optical signal being carried out polarization manipulation so that the multichannel polarized light signal after the polarization manipulation is uncorrelated mutually; These mutual incoherent multichannel polarized light signals are merged processing, utilize an optical fiber that multipath light signal is sent to distant-end node simultaneously; Because the multichannel polarised light that closes in the signal of road is uncorrelated mutually,, can recover the raw baseband signal that near-end node issues so distant-end node is conciliate polarization manipulation through carrying out corresponding the processing along separate routes.It is thus clear that, utilize this multi-input multi-output system, can realize multiple-input and multiple-output based on an optical fiber, build difficulty thereby greatly reduced system, and significantly reduced construction cost.
Fig. 3 is the structural representation of near-end node in the multi-input multi-output system of the embodiment of the invention.As shown in Figure 3, in the multi-input multi-output system of the foregoing description, near-end node comprises:
First signal sends receiving element 31, is used at downlink communication, sends two-way downlink optical signal at least; Be used at uplink communication, receive two-way uplink optical signal at least;
At least two first Polarization Control unit 32; Be used at downlink communication; The said downlink optical signal of two-way at least that said first signal is sent the receiving element transmission carries out polarization manipulation, forms the descending polarized light signal of two-way at least, and the descending polarized light signal of wherein said two-way at least is uncorrelated mutually; Be used at uplink communication, handle, obtain the said uplink optical signal of two-way at least through the up polarized light signal of two-way at least being carried out depolarization;
First closes road control unit 33 along separate routes, is used at downlink communication, the descending polarized light signal of said two-way is at least closed the road handle, and generates the said road of closing and transmits, and be sent to said far-end unit through said optical fiber; Be used at uplink communication,, obtain the up polarized light signal of said two-way at least through the said road reception signal that closes is carried out the shunt processing.
Wherein, It for example is BBU that first signal sends receiving element 31; Polarization Control unit 32 for example is the polarizer/polarizer that is connected with BBU, and first closes road shunt control unit 33 for example for closing road/splitter, in addition; The first Polarization Control unit 32 and first closes road shunt control unit 33 also can merge setting, promptly adopts to have the polarizer/polarizer that closes road/shunt function.
Fig. 4 is the structural representation of distant-end node in the multi-input multi-output system of the embodiment of the invention.As shown in Figure 4, in the multi-input multi-output system of the foregoing description, distant-end node comprises:
Second closes along separate routes control unit 41 of road, is used at downlink communication, through the said road of closing is transmitted and carries out shunt processing, obtains the descending polarized light signal of said two-way at least; Be used at uplink communication, the up polarized light signal of two-way at least closed the road handle, generate and close the road and receive signal, and be sent to said near-end unit;
At least two second Polarization Control unit 42 are used at downlink communication, handle through the descending polarized light signal of said two-way at least being carried out depolarization, obtain the said downlink optical signal of two-way at least; Be used at uplink communication, the said uplink optical signal of two-way is at least carried out polarization manipulation, form the up polarized light signal of said two-way at least;
At least two photoelectric conversion units 43 are used at downlink communication, convert the said downlink optical signal of two-way at least into two-way downlink electrical signal at least; Be used at uplink communication, the two-way uplink electrical signals converts the said uplink optical signal of two-way at least at least;
At least two radio-frequency receiving-transmitting processing units 44 are used at downlink communication, are radio frequency transmissions with the said downlink electrical of two-way at least conversion of signals, and accomplish descending transmission through said antenna; Be used at uplink communication, will convert the said uplink electrical signals of two-way at least into through the said radio frequency receiving signal of two-way at least of said antenna uplink reception.
Wherein, Second closes road shunt control unit 41 for example for closing road/splitter; The second Polarization Control unit 42 for example is the polarizer/polarizer; Photoelectric conversion unit 43 for example is an optical-electrical converter, and radio-frequency receiving-transmitting processing unit 44 is used to realize the conversion between the signal of telecommunication and the radiofrequency signal, for example comprises signal is carried out digital-to-analogue/analog-to-digital conversion, frequency conversion, filtering, amplification and data IF process etc.Photoelectric conversion unit 43 for example be RRU with radio-frequency receiving-transmitting processing unit 44, and the second Polarization Control unit 42 is connected with RRU, and second closes road shunt control unit 41 and be connected with RRU via the second Polarization Control unit 42.Wherein, the second Polarization Control unit 42 and second closes road shunt control unit 41 also can merge setting, promptly adopts to have the polarizer/polarizer that closes road/shunt function.
Be connected through coaxial cable between photoelectric conversion unit 43 and the radio-frequency receiving-transmitting processing unit 44, and be connected through coaxial cable between radio-frequency receiving-transmitting processing unit 44 and the antenna.Because when coaxial cable carries out signal of telecommunication transmission; The loss of signal that is produced is bigger with respect to Optical Fiber Transmission, therefore, and preferably; With distant-end node and the contiguous setting of antenna; Promptly pass through to shorten the coaxial cable length between radio-frequency receiving-transmitting processing unit 44 and the antenna, and the coaxial cable length between photoelectric conversion unit 43 and the radio-frequency receiving-transmitting processing unit 44, the power loss of signal in coaxial cable reduced.Especially when the mimo system with the foregoing description is applied to indoor distributed system; Radio-frequency receiving-transmitting processing unit 44 and antenna are contiguous to be provided with through making; 44 need of radio-frequency receiving-transmitting processing unit are that low power radiofrequency signal gets final product through the antenna emission with electrical signal conversion; And need not the conversion and the transmission of high-power RF signal, reduce system's difficulty and cost, and realized energy-saving and emission-reduction.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (3)
1. a multi-input multi-output system is characterized in that, comprises near-end node, distant-end node and antenna, and said near-end node is connected through optical fiber with said distant-end node, wherein:
Said near-end node is used at downlink communication, and two-way downlink optical signal is at least carried out polarization and closes the road and handle, and generates to close the road and transmit and send to said distant-end node; Be used at uplink communication, carry out shunt and depolarization processing, obtain two-way uplink optical signal at least through the road reception signal that closes that said distant-end node is sent;
Said distant-end node; Be used at downlink communication; The road of closing through said near-end node is sent transmits and carries out shunt and depolarization processing; Obtain the said downlink optical signal of two-way at least, convert said downlink optical signal into corresponding radio frequency transmissions, and accomplish descending transmission through said antenna; Be used at uplink communication; Receive two-way radio frequency receiving signal at least through said antenna uplink; Convert said radio frequency receiving signal into corresponding uplink optical signal, two-way uplink optical signal is at least carried out polarization and closes the road and handle, generates the said road reception signal that closes and send to said near-end node.
2. multi-input multi-output system according to claim 1 is characterized in that, said near-end node comprises:
First signal sends receiving element, is used at downlink communication, sends the said downlink optical signal of two-way at least; Be used at uplink communication, receive the said uplink optical signal of two-way at least;
At least two first Polarization Control unit; Be used at downlink communication; The said downlink optical signal of two-way at least that said first signal is sent the receiving element transmission carries out polarization manipulation, forms the descending polarized light signal of two-way at least, and the descending polarized light signal of wherein said two-way at least is uncorrelated mutually; Be used at uplink communication, handle, obtain the said uplink optical signal of two-way at least through the up polarized light signal of two-way at least being carried out depolarization;
First closes road control unit along separate routes, is used at downlink communication, the descending polarized light signal of said two-way is at least closed the road handle, and generates the said road of closing and transmits, and be sent to said far-end unit through said optical fiber; Be used at uplink communication,, obtain the up polarized light signal of said two-way at least through the said road reception signal that closes is carried out the shunt processing.
3. multi-input multi-output system according to claim 2 is characterized in that, said distant-end node comprises:
Second closes along separate routes control unit of road, is used at downlink communication, through the said road of closing is transmitted and carries out shunt processing, obtains the descending polarized light signal of said two-way at least; Be used at uplink communication, the up polarized light signal of two-way at least closed the road handle, generate and close the road and receive signal, and be sent to said near-end unit;
At least two second Polarization Control unit are used at downlink communication, handle through the descending polarized light signal of said two-way at least being carried out depolarization, obtain the said downlink optical signal of two-way at least; Be used at uplink communication, the said uplink optical signal of two-way is at least carried out polarization manipulation, form the up polarized light signal of said two-way at least;
At least two photoelectric conversion units are used at downlink communication, convert the said downlink optical signal of two-way at least into two-way downlink electrical signal at least; Be used at uplink communication, the two-way uplink electrical signals converts the said uplink optical signal of two-way at least at least;
At least two radio-frequency receiving-transmitting processing units are used at downlink communication, are radio frequency transmissions with the said downlink electrical of two-way at least conversion of signals, and accomplish descending transmission through said antenna; Be used at uplink communication, will convert the said uplink electrical signals of two-way at least into through the said radio frequency receiving signal of two-way at least of said antenna uplink reception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100261040A CN102594423A (en) | 2012-02-07 | 2012-02-07 | Multiinput-multioutput system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100261040A CN102594423A (en) | 2012-02-07 | 2012-02-07 | Multiinput-multioutput system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102594423A true CN102594423A (en) | 2012-07-18 |
Family
ID=46482665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100261040A Pending CN102594423A (en) | 2012-02-07 | 2012-02-07 | Multiinput-multioutput system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102594423A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004589A1 (en) * | 2014-07-09 | 2016-01-14 | 华为技术有限公司 | Signal transmission method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453268A (en) * | 2007-12-06 | 2009-06-10 | 北京高光科技有限公司 | Optical communication system based on polarization multiplex technique and method thereof |
| CN101677258A (en) * | 2008-09-19 | 2010-03-24 | 华为技术有限公司 | Method and device for transmitting and receiving polarization multiplex signals and polarization multiplex system |
| CN102315880A (en) * | 2010-07-05 | 2012-01-11 | 大唐移动通信设备有限公司 | Light path transmission method and device |
-
2012
- 2012-02-07 CN CN2012100261040A patent/CN102594423A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453268A (en) * | 2007-12-06 | 2009-06-10 | 北京高光科技有限公司 | Optical communication system based on polarization multiplex technique and method thereof |
| CN101677258A (en) * | 2008-09-19 | 2010-03-24 | 华为技术有限公司 | Method and device for transmitting and receiving polarization multiplex signals and polarization multiplex system |
| CN102315880A (en) * | 2010-07-05 | 2012-01-11 | 大唐移动通信设备有限公司 | Light path transmission method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004589A1 (en) * | 2014-07-09 | 2016-01-14 | 华为技术有限公司 | Signal transmission method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108199729B (en) | Multi-way selector switch, radio frequency system and wireless communication equipment | |
| CN103997352B (en) | Active antenna relevant device, system and transmitting-receiving calibration steps | |
| KR101971844B1 (en) | Method of downlink signal transport over backhaul communications through distributed processing | |
| JP6698833B2 (en) | Wireless access system | |
| CN102098688A (en) | Method, system and device for realizing MIMO (multiple input multiple output) of indoor distribution system | |
| US20170279500A1 (en) | Antenna and Active Antenna System | |
| CN102202323B (en) | Multi-mode covering access system | |
| CN109547105B (en) | Communication equipment for realizing MIMO transmission | |
| US10164731B2 (en) | Method for base station backhaul, related device and system for base station backhaul | |
| CN106357310B (en) | Multiple input multiple output signal transmission method and system | |
| CN111010680B (en) | Indoor distribution system | |
| WO2016090901A1 (en) | Multiple-input multiple-output (mimo) base station | |
| JP2014165614A (en) | Distributed wireless communication base station system, olt section, and onu section | |
| CN105553528B (en) | Multi-network integration access system based on LTE | |
| CN101465697B (en) | Optical fiber direct amplification and frequency conversion repeater and working method | |
| CN102869023A (en) | Indoor communication distribution system and communication method thereof | |
| US8897225B2 (en) | Apparatus and method for controlling communication path between multiple digital units and multiple radio frequency units in wireless communication system | |
| CN102664683A (en) | Remote signal processing method and remote unit used in remote optical fiber type wireless distribution systems | |
| WO2021115234A1 (en) | Central unit and remote unit | |
| CN103546215B (en) | LTE transmission and coverage system for achieving FTTH based on digital technology | |
| CN102594423A (en) | Multiinput-multioutput system | |
| CN102651873A (en) | Signal transmission method, system and equipment for indoor distribution system | |
| WO2013007213A1 (en) | System, device, and method for transmitting multi-input-multi-output signals | |
| CN101998518A (en) | Base station IR interface data transmission system and method | |
| CN205847266U (en) | A kind of distributed antenna system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120718 |