CN1870458A - Multi-user, multi-input, multi-output communication method and device - Google Patents

Multi-user, multi-input, multi-output communication method and device Download PDF

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CN1870458A
CN1870458A CN 200510073777 CN200510073777A CN1870458A CN 1870458 A CN1870458 A CN 1870458A CN 200510073777 CN200510073777 CN 200510073777 CN 200510073777 A CN200510073777 A CN 200510073777A CN 1870458 A CN1870458 A CN 1870458A
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黎海涛
李继峰
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

This invention provides a multi-user and multi-antenna communication method including: at the base station, carrying out geometrical mean analysis to the channel matrix to get a back filter matrix Q, an up triangle matrix R and a pre-coding matrix P, carrying out linear pre-coding to data emitted to users from the base station by matrix P, utilizing the multiplex conjugate transposed matrix QH of Q to transform the emission signals after pre-code in linearity, utilizing the coefficients in R corresponding to the users to eliminate signal interference among users in the emitted signals to be emitted to the channels and feeding back the QH of the Q to the user ends to be used to carry out linear transformation to the received signals at the receiving end.

Description

Multi-user, multi-input, multi-output communication method and device
Technical field
The present invention relates to a kind of multiple antenna communication, specifically, relate to a kind of multi-user multi-antenna communication means and device that utilizes dirty paper precoding and channel geometric average to decompose.
Background technology
Along with the fusion gradually of wireless network, multimedia technology and internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system.People generally believe that in the new generation of wireless system, many antennas input and output (MIMO) will become main Radio Transmission Technology.
Mimo system is meant and is sending and receiving terminal use multi-antenna array, need not to expend under the condition of excess power and bandwidth, can significantly improve power system capacity and wireless transmission link quality (bit error rate BER), be applicable to the multimedia service such as sound, video of transmission of high-rate.The mode of utilizing the MIMO technology to improve power system capacity and transmission quality comprises two classes: space division multiplexing and space diversity.Structure (BLAST) when the typical application example of space division multiplexing is dblast, it resolves into several independent sub data flows to entire stream and sends from multiple antenna is parallel; During more than or equal to number of transmit antennas, channel capacity and the number of transmit antennas of BLAST are linear at the reception antenna number, and this has promoted Shannon's theorems.
At present, the research of mimo system is developed into multi-user's stage from single user, and utilize multiple user information theory, promptly network information opinion is studied multi-user MIMO system.In the multiple user information theory, dirty paper code (Dirty Paper Coding:DPC) technology is subjected to extensive concern.Studies show that,, utilize DPC that pre-deletion is done in user's interference, can obtain optimum speed and capacity (sum-rate capacity, i.e. throughput) for Gauss's broadcast channel.But because each user's channel gain difference, the subchannel of a certain low channel gain will reduce bit error rate (BER) performance of whole system.
The list of references tabulation:
[1] people such as A.J.Paularj is published in the article that is entitled as " An Overview of MIMOCommunications-A Key to Gigabit Wireless " on the Proceedings of IEEE, in February, 2004, the 92nd volume, No. 2, the 198th～218 page.
[2] article that is entitled as " The Geometric Mean Decomposition, Linear Algebra and ItsApplications " published in December, 2003 of Y.Jiang, W.W.Hager and J.Li.
[3] B.Hassibi is published in the article that is entitled as " A Fast Square-Root Implementation forBLAST " on the 1255th～1259 page of the 34th the Asilomar Conf. in November, 2000.
[4] M.Costa is published in IEEE Trans.on information theory, May nineteen eighty-three, the 29th volume, the article that is entitled as " Writing on dirty paper " on 439～441 pages.
Summary of the invention
Consider the problems referred to above of prior art, the present invention proposes a kind of method, channel matrix is being carried out geometric average decomposition (GMD) afterwards, utilize the precoding battle array that obtains to do preliminary treatment to transmitting to realize channel compensation, make each subchannel gains identical, utilize the DPC technology to eliminate emission user's interference at the base station end then, thereby eliminate the BER performance defect that will reduce whole system because of the subchannel of a certain low channel gain.By the Combined Treatment of GMD and DPC, reach the purpose that improves the BER of system performance and capacity simultaneously.
The object of the invention is to provide a kind of MIMO communication means and device, uses this method and device thereof to have reduction system bit error rate and obtains advantage than major clique system capacity.
The solution of the present invention is by channel matrix being carried out geometric average is decomposed and utilize and decompose the matrix that obtains to the precoding that transmits, make each subchannel gains of antenna identical, reduced the error rate that system sends data; And the base station end utilizes dpc techniques before the base station user data interference work from other users to be deleted in advance, all can obtain under different state of signal-to-noise than major clique system capacity.
According to a first aspect of the invention, proposed a kind of multi-user multi-antenna communication means, it is characterized in that comprising step: at the base station end, utilized channel matrix to carry out preliminary treatment, make at the gain of each user's subchannel identical transmitting; At the base station end, the signal in utilizing dirty paper precoding algorithm to eliminate to transmit between each user disturbs, and is transmitted in the channel eliminating transmitting after disturbing; And, receive the signal that launches from the base station end at user side.
According to a second aspect of the invention, proposed a kind of multi-user multi-antenna communication means, it is characterized in that comprising: at the base station end, channel matrix has been carried out geometric average decompose, obtain back filtering matrix Q, upper triangular matrix R and pre-coding matrix P; Utilize matrix P to from the base station to the user's data, carrying out linear predictive coding; Utilize the complex-conjugate transpose matrix Q of back filtering matrix Q HTransmitting after the precoding carried out linear transformation; Utilize the subchannel gains coefficient and the upper triangular matrix R of each user's correspondence, the signal that transmits between middle user after the elimination linear transformation disturbs, and this signal is transmitted into channel; And the complex-conjugate transpose matrix Q that incites somebody to action back filtering matrix Q HFeed back to user side, and, utilize the complex-conjugate transpose matrix Q of back filtering matrix Q at receiving terminal HCarry out linear transformation to the received signal.
Preferably, described user-user signal interference eliminated step comprises: since first user 1 user U to the last, carry out following step: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
Preferably, described multi-user multi-antenna communication means can also comprise: at the base station end, the emission pilot signal is to channel; And, estimate each element of channel matrix at user side, i.e. gain coefficient, and it is fed back to the base station end.
According to a third aspect of the invention we, proposed a kind of multi-user multi-antenna communicator, having comprised: the channel matrix decomposition module, channel matrix is carried out geometric average decompose, obtain back filtering matrix Q, upper triangular matrix R and pre-coding matrix P; Precoding and linear transform module utilize matrix P to carrying out linear predictive coding from the base station to the user's data, and the complex-conjugate transpose matrix Q that utilizes back filtering matrix Q HTransmitting after the precoding carried out linear transformation; And the user-user signal interference blanking unit, utilize the subchannel gains coefficient and the upper triangular matrix R of each user's correspondence, eliminate that the signal between the user disturbs in the transmitting after the linear transformation.
Preferably, described user-user signal interference blanking unit, since first user 1 user U to the last, carry out following operation: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
According to a forth aspect of the invention, a kind of base station has been proposed, it is characterized in that comprising the multi-user multi-antenna communicator, described multi-user multi-antenna communicator comprises: the channel matrix decomposition module, channel matrix is carried out geometric average decompose, obtain back filtering matrix Q, upper triangular matrix R and pre-coding matrix P; Precoding and linear transform module utilize matrix P to carrying out linear predictive coding from the base station to the user's data, and the Hermitian transposed matrix Q that utilizes back filtering matrix Q HTransmitting after the precoding carried out linear transformation; And the user-user signal interference blanking unit, utilize the subchannel gains coefficient and the upper triangular matrix R of each user's correspondence, eliminate that the signal between the user disturbs in the transmitting after the linear transformation.
Preferably, described user-user signal interference blanking unit, since first user 1 user U to the last, carry out following operation: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
According to a fifth aspect of the invention, proposed a kind of multi-user multi-aerial communication system, it is characterized in that comprising according to base station of the present invention.
Description of drawings
Below with reference to accompanying drawings, the preferred embodiments of the present invention are described in detail, wherein:
Fig. 1 shows according to mimo system of the present invention;
Fig. 2 shows the flow chart according to MIMO communication means of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is specified.Be noted that described embodiment only is for illustrative purposes, rather than limitation of the scope of the invention.
At first, our ratio juris being described, for simplicity, is that example describes with single user's situation.For having N TWidth of cloth transmitting antenna and N RThe Single User MIMO system of reception antenna, received signal can be represented by following expression (1)
y＝Hx+n (1)
In the formula, y is N R* 1 dimension received signal vector, emission signal vector x ∈ C N T × 1 Variance be σ x 2I, the variance of white Gauss noise vector n is σ n 2So I is signal to noise ratio SNR = σ x 2 / σ n 2 = 1 / α 。Channel matrix H ∈ C N R × N T (N T≤ N R) order K=N T, the element h among the H JiBe the channel fading coefficient of transmitting antenna i to reception antenna j.
For the space division multiplexing mimo system, when transmitting terminal unknown channel state information (CSI), general received signal detection method is serial zero setting, deletion algorithm, i.e. the VBLAST detection method.For example, from N TWidth of cloth antenna begins, and utilizes method such as linear equalization (balanced as matched filtering, ZF (ZF), MMSE is balanced) to recover this width of cloth antenna and transmits; From received signal, deduct N TAfter width of cloth antenna transmits, continue from N T-1 width of cloth antenna begins, and then recovers this width of cloth aerial signal; Handle successively, up to the received signal of recovering last width of cloth antenna.This processing method is a kind of open loop mode of operation, has certain system capacity loss.After receiving terminal obtained channel gain information and feeds back to transmitting terminal, promptly reception, transmitting terminal all obtained channel condition information, and then system works is under closed loop mode.At this moment, can adopt following equivalent process method.
Channel matrix H is carried out the QR decomposition obtains,
H = Q N T × K R K × K - - - ( 2 )
In the formula, Q NT * KBe row orthogonal matrix, R K * KBe upper triangular matrix.So formula (1) can be rewritten as,
y＝QRx+n (3)
Formula (3) both sides are with multiply by Q H, () HRepresent close conjugation in distress (Hermitian) transposition (complex conjugate), obtain
y＝Rx+ n (4)
Expand into
Carry out serial signal according to formula (5) and detect,, calculate successively promptly since K subchannel x - i ← ( y - i - Σ j = i + 1 K r ij x - j ) / r ii , and it is mapped as demodulation symbol.
Can see that decompose by channel matrix H being carried out QR, mimo channel is broken down into K parallel sub-channels, promptly
y i＝r iix i+ n i，i＝1，2，…，K (6)
Utilize general ZF (ZF) equalization methods restoring signal at last.
It more than is the receiving handling method of general Single User MIMO system.For a communication system, it must possess the multi-user communication ability.Recently, people begin to use multiple user information theory (claiming network information opinion again) research multi-user MIMO system.Studies show that of multiple user information theory if the known interference from other users of transmitting terminal utilizes dirty paper code to do pre-deletion to disturbing, then all can reach the throughput of asymptotic optimum under high and low state of signal-to-noise.Costa has proposed the DPC notion the earliest, and its content is, to the scalar Gaussian channel, and the relation that exists expression (7) to provide:
y＝x+s+n (7)
Here, s is that Gaussian Profile is disturbed, and n is a Gaussian noise.If transmitting terminal known disturbances information, and disturb, then can obtain channel capacity identical when not adding interference in the transmitting terminal deletion.
This method can be used following model description, if channel is assumed to a piece of paper, disturbs s that paper has been made dirty, but the known s of transmitting terminal, the unknown s information of receiving terminal, transmitting terminal writes on this paper in the communication, is sent to receiving terminal and goes to read.There is certain precoder, can reaches and the identical rate of information throughput of on clean paper, writing writing on the dirty paper.
Based on the DPC notion, the method for a kind of DPC of realization is channel matrix H to be carried out QR decompose.Different with the aforementioned method of handling at receiving terminal, here, all operations of DPC is all finished at transmitting terminal (base station), because generally be difficult to know interference from other users at user's receiving terminal.And a key character of mimo system is a space diversity, and space diversity has been utilized the separate characteristics of different propagation paths between each width of cloth antenna.Under multi-user's situation, user's channel circumstance is also separate, and the method for utilizing the inconsistent characteristics of space channel of this different user is to allow a plurality of users launch information simultaneously, i.e. user side co-operation; And independently decipher recovering information stream at the base station receiving terminal, promptly many minutes group of received (MPR) modes are adopted in the base station.To the MIMO device among the present invention, the base station end is installed several antennas, and user side is installed a width of cloth antenna.Its communication mode is that during the downlink broadcast channel, the base station is respectively never with the signal of antenna end emission with each telex network; During the uplink multi-address channel, the base station is detected each user with many groupings receive mode and is transmitted.
If the base station end has N TIndividual user utilizes the dual nature of uplink and downlink, and we handle the VBLAST that the DPC problem of up channel is converted into down channel, promptly to H HCarry out the QR decomposition and obtain expression formula (8).
H H＝ Q R (8)
Substitution expression formula (1) is rewritten as expression formula (9)
y＝ R HQ Hx+n (9)
Definition x=Q x obtains expression formula (10)
y＝ R Hx+n (10)
Promptly
Figure A20051007377700111
Can see that decompose by the QR to channel matrix, mimo channel is broken down into K parallel sub-channels, promptly
y i＝ r iix i+n i (11)
Then, each subchannel is adopted step restoring signals such as ZF (ZF), interference delete.
Further, expression formula (10) can be rewritten as
y k = r k , k x k + &Sigma; j < k r k , j x j + n k k＝1，…，N T (12)
Under multi-user's situation, the physical meaning of this expression formula is, as user k＞N TThe time, no information sends; When j＞k, because of r K, j=0, thus for user k, from the interference of j＞k by zero setting; The known interference of transmitting terminal from user j＜k, and these interference were deleted before the signal emission of user K in advance.This method also claims ZF dirty paper code (ZF DPC), studies show that, ZF DPC all can reach the broadcast channel capacity under high and low SNR condition.
(SVD) is identical with characteristic value decomposition, utilizes ZF DPC technology, and channel matrix is carried out after QR decomposes, each subchannel still is the random fading feature, for each antenna branch, mistake appears in the user profile that the deep fade subchannel will cause being transmitted, and reduces the entire system performance.For this reason, among the present invention, adopt the geometric average that is proposed in the list of references [2] to decompose (GMD) method, channel matrix is decomposed again.Promptly be the Channel Transmission matrix decomposition
H H = Q - N R &times; K R - K &times; K P - N T &times; K H - - - ( 13 )
Here, semi-unitary matrix Q, P be respectively the emission, receiving terminal carry out pre-filtering and the back Filtering Processing; Upper triangular matrix R has equal diagonal element r Ii=λ, lambda definition is
&lambda; - = ( &Pi; k = 1 K &lambda; k ) 1 / K - - - ( 14 )
Wherein, λ kFor channel matrix H being carried out the diagonal matrix diag[γ that characteristic value decomposition (SVD) obtains 1γ k] the non-zero diagonal element, i.e. the nonzero eigenvalue of H.As seen, decompose by GMD, the diagonal element of the matrix R that obtains is the geometrical mean of the characteristic value of H, makes each subchannel gains identical, so can reduce because the different influences to the entire system performance of each subchannel decline.The realization of GMD can be finished by symmetry displacement and a pair of Robin Givens (Givens) rotary manipulation.
After introducing linear pre-coding matrix P and carrying out preliminary treatment to transmitting, received signal is
y＝H HP x+n (15)
Formula (13) substitution formula (15) is obtained
y = R - O - P - H P - x - + n = R - O - x - + n - - - ( 16 )
Both sides are with taking advantage of Q HObtain and the identical expression of formula (10): y=R HX+n thus, can utilize aforesaid interference delete method restoring signal.
Below, with reference to flow chart shown in Figure 2, multiuser mimo communication method according to the present invention is described in detail.
If the base station end is respectively from antenna 1 ... k ... N TEmission and N TThe signal of individual telex network,
At step S201, initialization step, user number counting u=0, total access customer number N T
At step S202, the emission pilot signal is to channel, and user side is estimated each element (the gain coefficient h in the channel matrix H Ij), and it is fed back to the base station end;
At step S203, the base station termination is received the channel matrix gain coefficient from user side, constitutes channel matrix H, channel matrix H is carried out the geometric average decomposition obtain back filtering matrix Q, upper triangular matrix R and pre-coding matrix P;
At step S204, utilize matrix P to from the base station to the user's data, carrying out linear predictive coding;
At step S205, back filtering matrix Q HFeed back to user side, and base station and user side all utilize Q HSignal is carried out linear transformation;
At step S206, at the base station end, user u and user 1 ..., the signal times of u-1 communication is with the coefficient among the upper triangular matrix R of each user's correspondence, thereby obtains these signals to the interference of communicating by letter between base station and the user u;
At step S207, from base station and signal that user u communicates by letter, deduct interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u, and this signal is transmitted into channel;
At step S208, upgrade user number counting u=u+1;
At step S209, judge u＞N TWhether set up, if u＞N T, then finish; Otherwise, change step S206 and carry out iterative processing.
By above-mentioned steps,,, can obtain not have other user's interference signals at user's receiving terminal by deleting the interference that other transmit in advance in every width of cloth antenna end when base station during from the signal of the emission of each width of cloth antenna and telex network.
Fig. 1 shows the multi-user MIMO system that is used to realize said method.The base station end is installed N TWidth of cloth antenna, each user side are installed a width of cloth antenna.At transmitting terminal, multi-user data stream is input to multiplexer 101, multiplexer 101 is sent into each transmitting antenna Zhi Luduan 102～102 ' to symbols streams in the mode of space division multiplexing, sends to channel through antenna 102～102 '.
At receiving terminal, the signal that every width of cloth antenna end 103～103 ' receives is sent into signal processor 104～104 ', signal processor is finished a series of signal and is handled back output; Channel estimation module 105～105 ' is estimated channel gain according to the pilot frequency sequence that receives, and by feedback channel it is fed back to combined apparatus 106.At combined apparatus 106, utilize channel estimation value, obtain channel matrix H, after carrying out a series of emissions, receive handling, P is returned to transmitting terminal preconditioning matrix, and reprocessing matrix Q is returned to receiving terminal.
Combined apparatus 106 comprises following functional module: 1061 pairs of channel matrix H of channel matrix decomposition module are carried out geometric average and are decomposed, obtain reprocessing matrix Q, upper triangular matrix R and preconditioning matrix P, and preconditioning matrix P is input to linear transformation and precoding module 1062; The precoding battle array P that this module 1062 utilizes channel matrix decomposition to obtain carries out linear predictive coding to transmitting, and the signal behind the coding is input to interference delete module 1063; This module 1063 according to precoding transmit, channel matrix H and upper triangular matrix R, remove the phase mutual interference between each user, transmitted; Counting module 1064,, then the renewal user and at the user after upgrading, changes interference delete processing module 1063 over to and proceeds to handle if do not finish in order to judge whether to finish the emission to all subscriber signals.
Among the present invention,, make each subchannel gains of antenna identical, reduced of the influence of deep fading's subchannel transmitting data stream by the mimo channel matrix being carried out the associating precoding processing of geometric average decomposition and base station, user side.Simultaneously, utilize dpc techniques before the user data transmission of base station, to do pre-deletion, then under different state of signal-to-noise, all can obtain, and reduce the user side signal and recovered the influence that time error is propagated than major clique system capacity to disturbing from other users.
Although illustrated and described the present invention at exemplary embodiments, will be understood by those skilled in the art that, under the situation that does not break away from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, the present invention should not be understood that to be limited to above-mentioned particular instance, and should be limited by claims.

Claims (9)

1, a kind of multi-user multi-antenna communication means is characterized in that comprising step:
At the base station end, utilize channel matrix to carry out preliminary treatment to transmitting, make the gain of each user's subchannel identical;
At the base station end, the signal in utilizing dirty paper precoding algorithm to eliminate to transmit between each user disturbs, and is transmitted in the channel eliminating transmitting after disturbing; And
At user side, receive the signal that launches from the base station end.
2, a kind of multi-user multi-antenna communication means is characterized in that comprising step:
At the base station end, channel matrix is carried out geometric average decompose, obtain back filtering matrix Q, upper triangular matrix R and pre-coding matrix P;
Utilize matrix P to from the base station to the user's data, carrying out linear predictive coding;
Utilize the complex-conjugate transpose matrix Q of back filtering matrix Q HTransmitting after the precoding carried out linear transformation;
Utilize the coefficient among the upper triangular matrix R of each user's correspondence, eliminate that the signal between the user disturbs in the transmitting after the linear transformation, and this signal is transmitted into channel; And
Complex-conjugate transpose matrix Q with back filtering matrix Q HFeed back to user side, and, utilize the complex-conjugate transpose matrix Q of back filtering matrix Q at receiving terminal HCarry out linear transformation to the received signal.
3, multi-user multi-antenna communication means according to claim 2, it is characterized in that described user-user signal interference eliminated step comprises: since first user 1 user U to the last, carry out following step: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
4, according to claim 2 or 3 described multi-user multi-antenna communication meanss, it is characterized in that also comprising: at the base station end, the emission pilot signal is to channel; And, estimate each gain coefficient in the channel matrix, and it is fed back to the base station end at user side.
5, a kind of multi-user multi-antenna communicator comprises:
Channel matrix decomposition module (1601) is carried out geometric average to channel matrix and is decomposed, and obtains back filtering matrix Q, upper triangular matrix R and pre-coding matrix P;
Precoding and linear transform module (1602) utilize matrix P to carrying out linear predictive coding from the base station to the user's data, and the complex-conjugate transpose matrix Q that utilizes back filtering matrix Q HTransmitting after the precoding carried out linear transformation; And
User-user signal interference blanking unit (1603) utilizes the subchannel gains coefficient and the upper triangular matrix R of each user's correspondence, eliminates that the signal between the user disturbs in the transmitting after the linear transformation.
6, multi-user multi-antenna communicator according to claim 5, it is characterized in that described user-user signal interference blanking unit (1603), since first user 1 user U to the last, carry out following operation: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
7, a kind of base station is characterized in that comprising the multi-user multi-antenna communicator, and described multi-user multi-antenna communicator comprises:
Channel matrix decomposition module (1601) is carried out geometric average to channel matrix and is decomposed, and obtains back filtering matrix Q, upper triangular matrix R and pre-coding matrix P;
Precoding and linear transform module (1602) utilize matrix P to carrying out linear predictive coding from the base station to the user's data, and the complex-conjugate transpose matrix Q that utilizes back filtering matrix Q HTransmitting after the precoding carried out linear transformation; And
User-user signal interference blanking unit (1603) utilizes the subchannel gains coefficient and the upper triangular matrix R of each user's correspondence, eliminates that the signal between the user disturbs in the transmitting after the linear transformation.
8, base station according to claim 7, it is characterized in that described user-user signal interference blanking unit (1603), since first user 1 user U to the last, carry out following operation: at user u, the signal times that base station and user 1 to u-1 are communicated is with the coefficient among the corresponding upper triangular matrix R of each user, obtain of the interference of these signals to the signal of communication between base station and the user u, and from base station and signal that user u communicates by letter, deduct described interference signal, again divided by the diagonal element of upper triangular matrix R, transmitting when obtaining the base station and communicating by letter with user u.
9, a kind of multi-user multi-aerial communication system is characterized in that comprising base station according to claim 6.
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