CN104618964A - Switching beam forming-based millimeter wave cooperative communication method - Google Patents
Switching beam forming-based millimeter wave cooperative communication method Download PDFInfo
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Abstract
The invention discloses a switching beam forming-based millimeter wave cooperative communication method. The method comprises the following steps: performing beam training on all receiving and transmitting equipment provided with array antennas in a network to establish an equipment interconnection optimal beam weighted vector table; establishing a direct transmission link between transmission equipment S and receiving equipment D with communication request in the network to perform communication; detecting whether the current direct transmission link is obstructed and starting a link switching step when the obstruction occurs; searching an optimal beam weighted vector between the transmission equipment S and the best cooperative equipment R to adjust the corresponding array antenna to communicate respectively. According to the communication method, when the direct transmission link is obstructed, a weighted vector is read from the previously established equipment interconnection optimal beam weighted vector table to adjust the beam direction; thus the transmission of S-D transmission link is substituted into transmission of S-R-D two-jump transmission link, the transmission link switching can be quickly and stably realized, and the continuity of the data transmission is guaranteed.
Description
Technical field
The invention belongs to millimetre-wave attenuator technical field, specifically, relate to a kind of millimeter wave collaboration communication method be shaped based on switching-beam.
Background technology
Low radio frequency section frequency spectrum resource utilizes more urgent, also day by day serious with the interference between the various technology of frequency range, even if employing high order modulation, multiplexing method are also difficult to the demand meeting current ultrahigh speed wireless transmission.In order to meet growing ultrahigh speed wireless transmission demand, certainly will need to develop the new frequency range possessing high bandwidth.Under this demand, the millimeter wave wireless communication technology being representative with 60GHz frequency range is arisen at the historic moment, and owing to having the broader frequency spectrum of several GHz, reaches as high as the transmitting power of 10W, by advantages such as low cost CMOS device realizations, become the one preferred technique realizing short distance Gbps level radio communication.
Can be there is the decay of energy in electromagnetic signal, and the energy size of decay is relevant with material behavior with the feature of signal own, comprises the dielectric constant etc. of signal frequency, polarization mode, incident angle and material when penetrating barrier in communication process.Almost for all materials, the attenuation that signal causes when passing through the obstacle of same thickness generally can present increase tendency along with the increase of signal frequency.So the material penetration loss of millimeter-wave signal is much bigger compared with low-frequency range, and communication link is very easy to stopped and interrupt.One of millimeter wave radio communication mainly application be exactly the transmission of indoor wireless high-definition multimedia, in the process of transmission, the stop that human motion brings will occur often, and penetrate loss that human body causes and to be enough to cause to direct transfer the interruption of link.In low frequency wireless communication system, after LOS (sighting distance) path is stopped, signal continues to keep communication link unimpeded by the mode such as diffraction or reflection, but the millimetre-sized wavelength of millimeter wave and serious reflection loss make to realize by modes such as diffraction and reflections the effect that NLOS (non line of sight) communicates will have a greatly reduced quality.When indoor do not exist very strong reverberation, at least low than the sighting distance composition 10dB of reflection path, if directly utilize reflection path, its communication interruption probability also can become large.Therefore not easily penetrate barrier and the multipath effect feature weak compared with low-frequency range allow millimeter-wave signal run into stop environment under carry out high-speed transfer and become and be not easy to realize, the link how overcome in communication process stops it is a problem that must solve.
Utilize relaying or cooperation transmission to be a kind of effective solution of anti-block communication, but generally adopt directional transmissions due to millimeter wave, therefore its cooperating process be different from the cooperative system of low-frequency range.If each equipment (DEV) signal transmission and reception direction remains direction, the effect of cooperation transmission when obviously cannot realize running into stop in system.
Summary of the invention
The present invention is in order to solve penetrating that barrier ability is weak, occurring stopping the problem easily causing communication disruption in communication process of existing millimeter wave frequency band wireless communication system, propose a kind of millimeter wave collaboration communication method be shaped based on switching-beam, can solve the problem.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
Based on the millimeter wave collaboration communication method that switching-beam is shaped, comprise the following steps:
(1), set up devices interconnect wave beam training period in a network, successively wave beam training is carried out to all devices in network, optimal beam pair when showing that each equipment intercoms between two mutually, the each antenna weight vector record of the optimal beam intercomed mutually between two by each equipment to correspondence forms weight vectors table, optimal beam when simultaneously utilizing the equipment chosen to intercom mutually between two often organizes the signal to noise ratio of InterWorking Equipment group receiving terminal to measuring, set up InterWorking Equipment receiving terminal signal to noise ratio snr record sheet, record respectively using each equipment as receiving terminal in described signal to noise ratio snr record sheet, other equipment are as signal to noise ratio during transmitting terminal,
(2) when, transmitting apparatus S intercoms mutually with receiving equipment D both sides, optimal beam both finding out from described weight vectors table time unobstructed between the two during communication is to weight vectors, and with this optimal beam to weight vectors adjustment array antenna direction, the link that direct transfers set up between transmitting apparatus S with receiving equipment D communicates;
(3), whether timing detect the current link that direct transfers and stop, when occurring to stop, starts link switching step, finds out current time slots in network and do not distribute and send or all free device R of the task of reception
1, R
2r
n, from signal to noise ratio snr record sheet, read the signal to noise ratio snr using each free device as the first hop link of cooperation respectively
s-Riwith the signal to noise ratio snr of the second hop link
ri-D, wherein, described first hop link is transmitting apparatus S and cooperative equipment R
i(i=1,2 ... n) communication link between, described second hop link is cooperative equipment R
iand the communication link between receiving equipment D, compares the signal to noise ratio snr of the first hop link
s-Riwith the signal to noise ratio snr of the second hop link
ri-Din smaller value min (SNR
s-Ri, SNR
ri-D) as cooperative equipment R
iduring cooperation whole double bounce synergistic link cooperation signal to noise ratio snr
s-Ri-D, compare each SNR
s-Ri-D(i=1,2 ... n) maximum in, and using the cooperative equipment corresponding to this maximum cooperation signal to noise ratio as best cooperative equipment;
(4), from described weight vectors table, find out optimal beam between transmitting apparatus S and best cooperative equipment respectively to weight vectors and the optimal beam between best cooperative equipment and receiving equipment D to weight vectors, adjust corresponding transceiver respectively and communicate with the beam position of cooperative equipment.
Further, after described step (4), the link that direct transfers also comprised between timing detection transmitting apparatus S and receiving equipment D stops the step whether recovered, if recover, then readjust the array antenna direction of transmitting apparatus S and receiving equipment D, transmission link is switched to the transmission link set up between transmitting apparatus S with receiving equipment D and communicate.
Further, in described step (4), also comprise timing and detect the step whether current cooperative transmission link stop occurs, transmitting apparatus S sends detectable signal, test SNR
s-Ri-D(i=1,2 ... n) cooperative equipment in corresponding to SNR maximum carries out link signal to noise ratio during collaboration communication, if be greater than the threshold value SNR preset
th, then can select this cooperative equipment is best cooperative equipment, otherwise chooses SNR
s-Ri-D(i=1,2 ... n) cooperative equipment corresponding to SNR Second Largest Value in, tests and whether is greater than SNR with the link signal to noise ratio of this cooperative equipment collaboration communication
th, judge whether to it can be used as best cooperative equipment, the like, until find signal to noise ratio to be greater than SNR
thlink, as optimum synergistic link.
Further, in described step (1), the method for all devices in network being carried out to wave beam training is:
In network, there is N number of equipment altogether, each equipment is all equipped with the aerial array of M array element, in order to realize the controlled switching-beam of beam position, during every two equipment room wave beams training, in the array antenna of each equipment, every root antenna all applies certain weight vectors, beam main lobe is made to point to desired orientation corresponding to weight vectors, record current beam is to the received power of correspondence or signal to noise ratio and record, each corresponding in switching-beam code book successively array antenna beam pointing, repeat to record received power corresponding to each beam position or signal to noise ratio, compare the maximum in all received powers or signal to noise ratio, select the wave beam corresponding to maximum in received power or signal to noise ratio to being optimal beam pair, and the weight vectors it applied write optimal beam is in weight vectors table.
Further, in described step (1), during every two equipment room wave beams training, in advance for each equipment sets up wave beam code book w (m when record array antenna beam difference is pointed to, k), code book w (m, k) represents the weight vectors forming m root antenna when being numbered the wave beam of k, and switching array controlling antenna wave beam to point is that the mode by reading every column vector successively from described wave beam code book obtains.
Further, the method that in described step (3), whether detection present transmission link occurs to stop is:
Transmitter S communicates to the respective optimal beam recorded in weight vectors table with optimal beam with receiving equipment D, whether there is stop every a frame period to present transmission link to detect, detect the signal to noise ratio at receiving equipment D place or receive available signal power, when receiving terminal signal to noise ratio is less than threshold value SNR
thor the available signal power received is less than threshold value P
thtime, judge that present transmission link is stopped.
Compared with prior art, advantage of the present invention and good effect are: the millimeter wave collaboration communication method be shaped based on switching-beam of the present invention, by judging whether transmission link stops, adopt the cooperation of free device in network to realize the transmission link between S-D to replace with the double bounce transmission link transmission of S-R-D, ensure that the continuity of transfer of data.By setting up optimal beam that each equipment intercoms between two mutually to weight vectors table, and set up the signal to noise ratio snr record sheet of InterWorking Equipment receiving terminal, when equipment room starts to communicate, do not need to carry out the training of transmitting-receiving wave beam again, directly call the beam communication pairing that the optimal beam weighing vector right to devices interconnect optimal beam in weight vectors table just can realize equipment room, bring very large convenience, save the time of wave beam training in communication equipment handoff procedure, thus realize the seamless switching communication after running into stop.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of embodiment flow chart of the millimeter wave collaboration communication method based on switching-beam shaping proposed by the invention;
Fig. 2 is the network model of the millimeter wave collaboration communication method based on switching-beam shaping proposed by the invention;
Fig. 3 is the millimeter wave directional transmissions coordination model of the millimeter wave collaboration communication method based on switching-beam shaping proposed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Wireless Personal Network (Wireless Personal Area Network, WPAN) network generally supports the intercommunication mutually between inner any two equipment (DEV).For general WPAN network, usual each equipment room all adopts omnidirectional antenna, and the arbitrary orientation no matter transmitting apparatus is positioned at receiving equipment can receive.But millimeter-wave systems generally carries out beam communication, if each device signal sending direction points to a direction all the time in system, obviously the demand that in WPAN network, each equipment room is interconnected cannot be realized.Now, the switching-beam forming technique of array antenna also becomes the one preferred technique of structure millimeter wave-WPAN internet, it both can realize the change at any time of each equipment beam position, the directional transmissions gain of generation can be utilized again to make up the huge path loss of millimeter wave, and this also provides a solution for the anti-block communication of millimeter wave simultaneously.In order to reduce the complexity of design, the present invention realizes, based on the anti-block communication of equipment cooperation in WPAN network, being described in detail below with a specific embodiment based on switching-beam shaping by adopting.
Embodiment one, the present embodiment proposes a kind of millimeter wave collaboration communication method be shaped based on switching-beam, as shown in Figure 1, comprises the following steps:
S1, set up devices interconnect wave beam training period in a network, successively wave beam training is carried out to all devices in network, optimal beam pair when showing that each equipment intercoms between two mutually, the each antenna weight vector record of the optimal beam intercomed mutually between two by each equipment to correspondence forms weight vectors table, optimal beam when simultaneously utilizing the equipment chosen to intercom mutually between two often organizes the signal to noise ratio of InterWorking Equipment group receiving terminal to measuring, set up InterWorking Equipment receiving terminal signal to noise ratio snr record sheet, record respectively using each equipment as receiving terminal in described signal to noise ratio snr record sheet, other equipment are as signal to noise ratio during transmitting terminal, this step by the optimal beam setting up each equipment and intercom mutually between two to weight vectors table, and set up the signal to noise ratio snr record sheet of InterWorking Equipment receiving terminal, when equipment room starts to communicate, do not need to carry out the training of transmitting-receiving wave beam again, directly call the beam communication pairing that the optimal beam weight vectors right to two equipment optimal beam in weight vectors table just can realize equipment room, bring very large convenience, save communication equipment to match between two time of wave beam training in handoff procedure, selecting in optimum cooperative node process by the signal to noise ratio snr record sheet set up in advance, avoid and will first find each cooperative node optimal beam to this process through complex survey when link runs into stop, effectively shorten the time that link stops rear beam switchover, improve the communication efficiency after link stop.
When S2, transmitting apparatus S intercom mutually with receiving equipment D both sides, optimal beam both finding out from described weight vectors table time unobstructed between the two during communication is to weight vectors, and with this optimal beam to weight vectors adjustment array antenna direction, the link that direct transfers set up between transmitting apparatus S with receiving equipment D communicates;
Whether S3, timing detect the current link that direct transfers and stop, when occurring to stop, starting link switching step, finding out all free device R that current time slots in network does not distribute transmission or the task of reception
1, R
2r
n, from signal to noise ratio snr record sheet, read the signal to noise ratio snr using each free device as the first hop link of cooperation respectively
s-Riwith the signal to noise ratio snr of the second hop link
ri-D, wherein, described first hop link is transmitting apparatus S and cooperative equipment R
i(i=1,2 ... n) communication link between, described second hop link is cooperative equipment R
iand the communication link between receiving equipment D, compares the signal to noise ratio snr of the first hop link
s-Riwith the signal to noise ratio snr of the second hop link
ri-Din smaller value min (SNR
s-Ri, SNR
ri-D) as cooperative equipment R
iduring cooperation whole double bounce synergistic link cooperation signal to noise ratio snr
s-Ri-D, compare each SNR
s-Ri-D(i=1,2 ... n) maximum in, and using the cooperative equipment corresponding to this maximum cooperation signal to noise ratio as best cooperative equipment; Whether this step is stopped by the judgement transmission link that direct transfers, and adopts the cooperation of free device in network to realize the transmission link between S-D to replace with the double bounce transmission link transmission of S-R-D, ensure that the continuity of transfer of data.
S4, from described weight vectors table, find out optimal beam between transmitting apparatus S and best cooperative equipment R respectively to weight vectors and the optimal beam between best cooperative equipment R and receiving equipment D to weight vectors, adjust corresponding transceiver respectively and communicate with the beam position of cooperative equipment.。
The performance of system likely can be made to get a promotion although adopt other equipment to cooperate, owing to adopting the power consumption cooperating and need cooperative equipment consumption extra, so when the path that direct transfers stops elimination, or ensure that employing direct transfers link communication as far as possible.In the present embodiment, after described step S4, the link that direct transfers also comprised between timing detection transmitting apparatus S and receiving equipment D stops the step whether recovered, if recover, then readjust the array antenna direction of transmitting apparatus S and receiving equipment D, transmission link is switched to the link that direct transfers set up between transmitting apparatus S with receiving equipment D and communicate.Whether the path that direct transfers stopped detect owing to setting transceiver timing (such as every a transmission frame), therefore when detecting that the path that direct transfers is recovered, readjust transmitting-receiving node beam position, realize sending node S receiving node D mutually to point to, utilize the path communication that direct transfers.
Because the link through cooperative equipment also exists the possibility be obscured by an obstacle, now the devices communicating snr value that characterizes may also can be influenced and change when stopping for signal to noise ratio snr record sheet, for addressing this problem the signal to noise ratio test process again in the best cooperative equipment selection of setting, in described step S4, also comprise timing and detect the step whether current cooperative transmission link stop occurs, transmitting apparatus S sends detectable signal, test SNR
s-Ri-D(i=1,2 ... n) cooperative equipment in corresponding to SNR maximum carries out link signal to noise ratio during collaboration communication, if be greater than the threshold value SNR preset
th, then can select this cooperative equipment is best cooperative equipment, otherwise chooses SNR
s-Ri-D(i=1,2 ... n) cooperative equipment corresponding to SNR Second Largest Value in, tests and whether is greater than SNR with the link signal to noise ratio of this cooperative equipment collaboration communication
th, judge whether to it can be used as best cooperative equipment, the like, until find signal to noise ratio to be greater than SNR
thlink, as optimum synergistic link.
As a preferred embodiment, in described step S1, the method for all devices in network being carried out to wave beam training is:
As shown in Figure 2, in network, there is N number of equipment altogether, be respectively DEV1, DEV2, DEV3, DEV N, each equipment is all equipped with the aerial array of M array element, in order to realize the controlled switching-beam of beam position, during every two equipment room wave beams training, in the array antenna of each equipment, every root antenna all applies certain weight vectors (comprising phase and magnitude), beam main lobe is made to point to desired orientation corresponding to weight vectors, record current beam is to the received power of correspondence or signal to noise ratio and record, each corresponding in switching-beam code book successively array antenna beam pointing, repeat to record received power corresponding to each beam position or signal to noise ratio, compare the maximum in all received powers or signal to noise ratio, select the wave beam corresponding to maximum in received power or signal to noise ratio to being optimal beam pair, and the weight vectors it applied write optimal beam is in weight vectors table.As shown in Figure 1, set up the initial stage at WPAN network, DEV1 is selected as the piconet tuning controller (Piconet Coordinator, PNC) in this WPAN network.The number of devices that PNC comprises in statistics this network good and the situation guaranteed to direct transfer each equipment room path do not stop issue out wave beam training instruction, DEV1 successively with DEV2, DEV3, DEV N carries out wave beam training, concrete training process between every two DEV is as follows: in described step S1, during every two equipment room wave beams training, in advance for each equipment sets up wave beam code book w (m when record array antenna beam difference is pointed to, k), code book w (m, k) weight vectors forming m root antenna when being numbered the wave beam of k is represented, switching array controlling antenna wave beam to point is that the mode by reading every column vector successively from described wave beam code book obtains.Suppose that transmitting apparatus and each self-contained transmitting-receiving wave beam of receiving equipment are respectively Nt, Nr.Applying the 1st group of weight vectors in wave beam code book to the array antenna of transmitting apparatus makes its beam position direction 1 send training sequence, receives DEV successively at its wave beam 1,2 ..., Nr direction receives; Then send DEV successively at wave beam 2,3 ..., Nt direction send training sequence, each receiving terminal at wave beam 1,2 ..., receiving course is repeated in Nr direction; Optimal beam when finally finding out two devices communicatings according to different beams to the received power of correspondence or optimum signal to noise ratio, to (p, q), finds the weighing vector that this wave beam corresponding is right simultaneously from wave beam code book.
Repeat according to this process, find the respective optimal beam pair when all devices communicates mutually in WPAN network, each equipment is interconnected optimal beam record is carried out to the antenna weight vector of correspondence, as shown in table 1:
Table 1
W
1 (2)and W
2 (1)the weighing vector value that the optimal beam adopted separately when representing DEV1-DEV2 connection communication is respectively corresponding.W
1 (2)subscript 1 (2) represents that DEV1 points to the optimal beam weighing vector of DEV2.The wave beam of each DEV equipment room trains this process just to carry out at the beginning in the foundation of WPAN network, when starting like this to communicate when between DEV, when not blocking, the training of transmitting-receiving wave beam is carried out again with regard to not needing, the weighing vector that in direct call list 1, the interconnected optimal beam of DEV is right just can realize the beam communication pairing between DEV, this results in very large convenience, save the time of wave beam training in communication equipment handoff procedure.
Conveniently the choosing of optimum cooperative node, we establish WPAN devices interconnect wave beam to weighing vector record sheet while, utilizing the optimal beam selected to measuring the SNR often organizing receiving terminal when InterWorking Equipment communicates, also setting up an InterWorking Equipment receiving terminal SNR record sheet, as shown in table 2:
Table 2
In table 2, SNR
12represent that DEV1-DEV2 connects communication, during employing optimal beam pair, the signal to noise ratio of DEV2 receiving terminal, also obtain the link SNR of each devices interconnect like this at the WPAN network initial stage of setting up.
Further, detect in described step S3 present transmission link whether occur stop method be:
Transmitter S communicates to the respective optimal beam recorded in weight vectors table with optimal beam with receiving equipment D, whether there is stop every a frame period to present transmission link to detect, detect the signal to noise ratio at receiving equipment D place or receive available signal power, when receiving terminal signal to noise ratio is less than threshold value SNR
thmaybe when the available signal power received is less than threshold value P
thtime, judge that present transmission link is stopped.
As shown in Figure 3, when communication link does not stop, transmitting node S communicates to the respective optimal beam recorded in weighing vector record sheet with interconnected wave beam with receiving node D, to present transmission link, whether stop occurs detect every a frame period.Utilize the signal to noise ratio (SNR) at receiving terminal place when detecting LOS path communication or receive available signal power P
thjudge whether link is stopped.When receiving terminal SNR is less than default SNR thresholding SNR
thmaybe as the power P r<P received
thtime, judge that link is stopped.The SNR preset
thor P
thcan according to C=Wlog
2(1+SNR
tH) calculate the lower limit of SNR, wherein C is the minimum transmission rate of requirement, and passes through
minimum received power lower limit can be calculated, wherein N
0represent the one-sided power spectrum density of white Gaussian noise, W is signal bandwidth.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (6)
1., based on the millimeter wave collaboration communication method that switching-beam is shaped, it is characterized in that, comprise the following steps:
(1), set up devices interconnect wave beam training period in a network, successively wave beam training is carried out to all devices in network, optimal beam pair when showing that each equipment intercoms between two mutually, the each antenna weight vector record of the optimal beam intercomed mutually between two by each equipment to correspondence forms weight vectors table, optimal beam when simultaneously utilizing the equipment chosen to intercom mutually between two often organizes the signal to noise ratio of InterWorking Equipment group receiving terminal to measuring, set up InterWorking Equipment receiving terminal signal to noise ratio snr record sheet, record respectively using each equipment as receiving terminal in described signal to noise ratio snr record sheet, other equipment are as signal to noise ratio during transmitting terminal,
(2) when, transmitting apparatus S intercoms mutually with receiving equipment D both sides, optimal beam both finding out from described weight vectors table time unobstructed between the two during communication is to weight vectors, and with this optimal beam to weight vectors adjustment array antenna direction, the link that direct transfers set up between transmitting apparatus S with receiving equipment D communicates;
(3), whether timing detect the current link that direct transfers and stop, when occurring to stop, starts link switching step, finds out current time slots in network and do not distribute and send or all free device R of the task of reception
1, R
2r
n, from signal to noise ratio snr record sheet, read the signal to noise ratio snr using each free device as the first hop link of cooperation respectively
s-Riwith the signal to noise ratio snr of the second hop link
ri-D, wherein, described first hop link is transmitting apparatus S and cooperative equipment R
i(i=1,2 ... n) communication link between, described second hop link is cooperative equipment R
iand the communication link between receiving equipment D, compares the signal to noise ratio snr of the first hop link
s-Riwith the signal to noise ratio snr of the second hop link
ri-Din smaller value min (SNR
s-Ri, SNR
ri-D) as cooperative equipment R
iduring cooperation whole double bounce synergistic link cooperation signal to noise ratio snr
s-Ri-D, compare each SNR
s-Ri-D(i=1,2 ... n) maximum in, and using the cooperative equipment corresponding to this maximum cooperation signal to noise ratio as best cooperative equipment;
(4), from described weight vectors table, find out optimal beam between transmitting apparatus S and best cooperative equipment respectively to weight vectors and the optimal beam between best cooperative equipment and receiving equipment D to weight vectors, adjust corresponding transceiver respectively and communicate with the beam position of cooperative equipment.
2. the millimeter wave collaboration communication method be shaped based on switching-beam according to claim 1, it is characterized in that, after described step (4), the link that direct transfers also comprised between timing detection transmitting apparatus S and receiving equipment D stops the step whether recovered, if recover, then readjust the array antenna direction of transmitting apparatus S and receiving equipment D, transmission link is switched to the transmission link set up between transmitting apparatus S with receiving equipment D and communicate.
3. the millimeter wave collaboration communication method be shaped based on switching-beam according to claim 1 and 2, it is characterized in that, in described step (4), also comprise timing and detect the step whether current cooperative transmission link stop occurs, transmitting apparatus S sends detectable signal, test SNR
s-Ri-D(i=1,2 ... n) cooperative equipment in corresponding to SNR maximum carries out link signal to noise ratio during collaboration communication, if be greater than the threshold value SNR preset
th, then can select this cooperative equipment is best cooperative equipment, otherwise chooses SNR
s-Ri-D(i=1,2 ... n) cooperative equipment corresponding to SNR Second Largest Value in, tests and whether is greater than SNR with the link signal to noise ratio of this cooperative equipment collaboration communication
th, judge whether to it can be used as best cooperative equipment, the like, until find signal to noise ratio to be greater than SNR
thlink, as optimum synergistic link.
4. the millimeter wave collaboration communication method be shaped based on switching-beam according to claim 1, it is characterized in that, in described step (1), the method for all devices in network being carried out to wave beam training is:
In network, there is N number of equipment altogether, each equipment is all equipped with the aerial array of M array element, in order to realize the controlled switching-beam of beam position, during every two equipment room wave beams training, in the array antenna of each equipment, every root antenna all applies certain weight vectors, beam main lobe is made to point to desired orientation corresponding to weight vectors, record current beam is to the received power of correspondence or signal to noise ratio and record, each corresponding in switching-beam code book successively array antenna beam pointing, repeat to record received power corresponding to each beam position or signal to noise ratio, compare the maximum in all received powers or signal to noise ratio, select the wave beam corresponding to maximum in received power or signal to noise ratio to being optimal beam pair, and the weight vectors it applied write optimal beam is in weight vectors table.
5. the millimeter wave collaboration communication method be shaped based on switching-beam according to claim 1, it is characterized in that, in described step (1), during every two equipment room wave beams training, in advance for each equipment sets up wave beam code book w (m when record array antenna beam difference is pointed to, k), code book w (m, k) represent the weight vectors forming m root antenna when being numbered the wave beam of k, switching array controlling antenna wave beam to point is that the mode by reading every column vector successively from described wave beam code book obtains.
6. the millimeter wave collaboration communication method be shaped based on switching-beam according to claim 1, is characterized in that, the method that in described step (3), whether detection present transmission link occurs to stop is:
Transmitter S communicates to the respective optimal beam recorded in weight vectors table with optimal beam with receiving equipment D, whether there is stop every a frame period to present transmission link to detect, detect the signal to noise ratio at receiving equipment D place or receive available signal power, when receiving terminal signal to noise ratio is less than threshold value SNRTh or the available signal power that receives is less than threshold value PTh, judge that present transmission link is stopped.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553531A (en) * | 2015-12-14 | 2016-05-04 | 北京邮电大学 | Millimeter wave system fast channel estimation method |
| WO2017020202A1 (en) * | 2015-07-31 | 2017-02-09 | 华为技术有限公司 | Training beam transmission method, apparatus and system |
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