CN1909402B - Self-adapting transmission method and apparatus used in spacing related MIMO system - Google Patents

Self-adapting transmission method and apparatus used in spacing related MIMO system Download PDF

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CN1909402B
CN1909402B CN2005100893958A CN200510089395A CN1909402B CN 1909402 B CN1909402 B CN 1909402B CN 2005100893958 A CN2005100893958 A CN 2005100893958A CN 200510089395 A CN200510089395 A CN 200510089395A CN 1909402 B CN1909402 B CN 1909402B
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matrix
channel
transmitting terminal
characteristic
modulation
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CN1909402A (en
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佘小明
李继峰
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

The invention relates to a self-adaptive transmission method used in spatial correlative multi-input multi-output communication system, wherein it comprises: the receiver estimates the signal channel stat character to feedback it to the sender; the sender via the feedback signal channel stat character, fixes the power distribute matrix and the pretreatment matrix; the receiver via the signal channel character modulates and codes parameter to send it to the sender; the sender via fixed power distribute matrix and pretreatment matrix, pretreats the sending signal and distributes power, then modulates and codes the sending signal via received modulate and code parameter, to send signal via antenna.

Description

Adaptive transmission method that in spacing related MIMO system, uses and equipment
Technical field
The present invention relates to the technology for self-adaptively transmitting in the spacing related MIMO system, more specifically, relate to a kind of adaptive transmission method that in spacing related MIMO system, uses and equipment, the performance of Adaptive Transmission in the relative MIMO system be can improve, too much expense and the increase on the complexity do not brought simultaneously for system.
Background technology
The more and more higher rate of information throughput is one of subject matter of facing of future broadband wireless communication systems.In order to realize this goal on limited frequency spectrum resources, multi-antenna technology (MIMO, multiple-input and multiple-output) has become one of requisite means that adopted in the following radio communication.In mimo system, transmitting terminal utilizes many antennas to carry out the transmission of signal, and receiving terminal utilizes many antennas to carry out the reception of spacing wave.Studies show that than traditional single antenna transmissions method, the MIMO technology can improve channel capacity significantly, thereby improve the rate of information throughput.
Except the MIMO technology, technology for self-adaptively transmitting also can effectively improve the rate of information throughput in the fading channel.Adaptive modulation and coding (AMC) technology is a kind of important technology for self-adaptively transmitting, its basic thought is modulation and the coding parameter that adopts when adaptive variation sends according to the current characteristic of channel, by some information that pass when channel condition is good more, passing the average throughput capability that some information improve system when bad channel conditions less, also is the average frequency spectrum utilance.
Therefore, if MIMO is combined with the AMC technology, can obtain than the higher rate of information throughput of a kind of technology of simple use.
Figure 1 shows that the mimo system structural representation of common employing AMC technology.Such as the PARC that in 3GPP, proposes (by the antenna rate controlled) scheme by Lucent company.
In this structure, transmitting terminal and receiving terminal adopt n respectively TAnd n RIndividual antenna carries out the transmission and the reception of signal.At transmitting terminal, data to be sent at first are divided into n through the processing of serial to parallel conversion device 101 TIndividual substream of data, the corresponding transmitting antenna of each substream of data.Before sending, in adaptive modulation and coding device 102, these substream of data are carried out adaptive modulation and coding according to the pairing channel transfer characteristic of current each transmitting antenna.Each substream of data required modulation and coding parameter M when AMC 1, M 2..., M NTCome from the feedback that receiving terminal is undertaken by feedback channel 108.
At receiving terminal, at first by n R Individual reception antenna 104 receives the whole signals in space, carry out channel estimating by channel estimating apparatus 105 according to pilot signal in this received signal or employing additive method then, (for mimo system, its characteristic of channel can be with a n to estimate current characteristic of channel matrix H R* n TMatrix describe).Then, AMC selection of parameter device 107 is determined modulation and the coding parameter that each substream of data of transmitting terminal is adopted according to H, and the modulation of each substream of data that will choose and coding parameter send it back transmitting terminal by feedback channel.Here,, generally take each antenna constant power of transmitting terminal to send in order to reduce the system feedback expense, and, when each son stream AMC parameter of feedback, only return each modulation and coding parameter corresponding sequence number.At last, MIMO checkout gear 106 is according to characteristic of channel matrix H, and the modulating-coding parameter of each son stream of AMC selection of parameter device 107 outputs, adopts general MIMO detection method that each is sent substream of data and detects, and obtain original transmission data.
In PARC, the operation in the AMC selection of parameter device 107, promptly AMC selection of parameter process can be divided into for two steps:
(1) according to current characteristic of channel matrix H, calculate each height stream 1,2 in advance ..., n TEquivalent SINR (signal and interference-to-noise ratio) after MIMO detects: SINR (1), SINR (2) ..., SINR (n T).
Here, adoptable MIMO detection method has multiple, such as: the linearity test method comprises that ZF (ZF) and least mean-square error (MMSE) detect; Counteracting serial interference (SIC) method; Maximum likelihood detection method or the like.The computational methods of the son stream detection equivalent SINR in back under the various MIMO detections have been provided in the existing document.Such as: when adopting ZF to detect, the SINR that k son flowed through after the detection is: SINR ( k ) = E s n T N 0 [ H * H ] kk - 1 ; When adopting MMSE to detect, the SINR that k son flowed through after the detection is: SINR ( k ) = E s n T N 0 [ H * H + N 0 / E s I nT ] kk - 1 - 1 , E wherein sFor sending gross power, N 0Be noise power, I NTBe n T* n TUnit matrix.
(2) according to resulting SINR (1), SINR (2) ..., SINR (n T), be each height stream choice of modulation and coding parameter M 1, M 2..., M NT
Determine that by SINR the modulating-coding parameter can adopt several different methods, such as adopting following method: at first selected some kinds of modulation are made up with coding parameter, and estimate the BER performance of various parameters under AWGN (additive white Gaussian noise) channel by theoretical derivation or numerical method.Then, the SINR numerical value after detecting according to each son stream is chosen and can be satisfied modulation and the coding parameter that certain BER requires and the maximum modulating-coding parameter of handling up flows as this transmissions.
Studies show that, in mimo system, adopt the adaptive transmission method of PARC can obtain throughput performance preferably.But the acquisition of this better throughput performance needs a prerequisite, that be exactly mimo channel be independently.
Yet in the mimo system of reality, mimo channel is correlated with often.Cause the relevant reason of mimo channel to have a lot, the spacing of placing such as antenna is enough not far away, does not have abundant scattering thing around the antenna, and has direct projection footpath (LOS) or the like between the transmitting-receiving.When the mimo channel existence was relevant, its characteristic of channel matrix H can be described with following formula: H = R r 1 / 2 H w R t 1 / 2
Wherein, H wBe n R* n TIndependent mimo channel feature matrix, R rAnd R tBe respectively n R* n RAnd n T* n TReception and send correlation matrix.
Compare with independent mimo system, the PARC method has very big performance loss in the relative MIMO system of reality.In order to overcome the performance loss that channel relevancy brings, prior art has provided a kind of based on the method for instantaneous characteristic of channel matrix H being carried out singular value decomposition (SVD).The thinking of this method is such: at each delivery time, will be estimated that by receiving terminal the current characteristic of channel matrix H of gained sends it back transmitting terminal by feedback channel, and by transmitting terminal H be carried out SVD again, and utilize the result of SVD to carry out preliminary treatment to sending signal.Though this method can improve relevant MIMO performance down to a certain extent, yet each moment all will be fed back and makes SVD H in real system, and saying so from system feedback expense and implementation complexity is difficult to tolerate.
For this reason, how to design a kind of new adaptive transmission method, can obtain than the better adaptive performance of conventional P ARC method, on the other hand on the one hand at spacing related MIMO system, can not a main purpose of this invention again for system brings too much expense and the increase on the complexity.
Summary of the invention
The objective of the invention is to propose a kind of adaptive transmission method that in spacing related MIMO system, uses and equipment, can improve the performance of Adaptive Transmission in the relative MIMO system, do not bring too much expense and the increase on the complexity simultaneously for system.In the method according to this invention, transmitting terminal during according to MIMO correlated channels long statistical property carry out preliminary treatment and power division to sending signal, receiving terminal sends sub-stream according to the characteristic of channel in short-term and carries out Bit Allocation in Discrete each.In this method, statistical property and characteristic are in short-term compared with conventional method when having utilized MIMO correlated channels long simultaneously when adaptive parameter selection, can obtain better adaptive performance under close implementation complexity and feedback overhead prerequisite.
To achieve these goals, according to the present invention, proposed a kind of adaptive transmission method that uses in the space correlation multiple-input-multiple-output communication system, having comprised: receiving terminal is estimated the channel statistical characteristic and it is fed back to transmitting terminal; The channel statistical characteristic that transmitting terminal comes according to feedback is determined power division matrix and preconditioning matrix; Receiving terminal is determined modulation and coding parameter according to the characteristic of channel and is sent to transmitting terminal; And transmitting terminal carries out preliminary treatment and power division according to determined power division matrix and preconditioning matrix to sending signal, and according to the modulation that receives from receiving terminal and coding parameter to sending signal and modulate and encoding, so that launch described transmission signal by antenna.
Preferably, the described transmitting terminal channel statistical characteristic of coming according to feedback determines that the step of power division matrix and preconditioning matrix comprises: statistical property is determined power division matrix and preconditioning matrix during according to multiple-input and multiple-output correlated channels long.
Preferably, statistical property is R=E{H during described multiple-input and multiple-output correlated channels long HR n -1H}, wherein H is the multi-input multi-ouput channel feature matrix, R nBe the covariance matrix of additive noise n in the received signal, and E is the mathematic expectaion operator.
Preferably, receiving terminal determines that according to the characteristic of channel modulation and coding parameter and the step that sends to transmitting terminal comprise: determine described modulation and coding parameter according to the characteristic of channel in short-term.
Preferably, described transmitting terminal during according to multiple-input and multiple-output correlated channels long statistical property to sending before signal carries out the step of preliminary treatment and power division, also comprise step: at first determine the parallel sub-flow amount L that transmitting terminal sends, L is chosen by system, and its value should be not more than the order of R.
Preferably, transmitting terminal according to feedback come long the time channel statistical characteristic determine that the step of preconditioning matrix comprises: after R is carried out characteristic value decomposition; And choose the L * n that its maximum L pairing characteristic vector of characteristic value is formed TMatrix.
Preferably, transmitting terminal determines that according to the next channel statistical characteristic of feedback the step of power division matrix comprises: determine the power division matrix according to the mode that constant power distributes and water injection power is distributed.
Preferably, described method also comprises: receiving terminal utilizes current characteristic of channel matrix and channel statistic property, eliminates the pretreated effect of transmitting terminal by filtering, and by filtering noise is carried out albefaction and handle, and carries out matched filtering to received signal.
According to the present invention, a kind of Adaptive Transmission equipment that uses in the space correlation multiple-input-multiple-output communication system has also been proposed, comprising: be in the statistical property calculation element of receiving terminal, be used to estimate the channel statistical characteristic and it is fed back to transmitting terminal; Be in the long timed unit of transmitting terminal,, determine power division matrix and preconditioning matrix according to the channel statistical characteristic that feedback is come; Be in the modulation and the coding parameter selecting device of receiving terminal, be used for determining modulation and coding parameter and sending to transmitting terminal according to the characteristic of channel; Be in the power distribution unit of transmitting terminal, be used for carrying out preliminary treatment and power division to sending data according to determined power division matrix; Be in the pretreatment unit of transmitting terminal, be used for carrying out preliminary treatment to sending data according to determined preconditioning matrix; And the modulation and the code device that are in transmitting terminal, modulation that feeds back according to receiving terminal and coding parameter are to sending signal and modulate and encoding.
Preferably, above-mentioned Adaptive Transmission equipment also comprises: filter, be used to utilize current characteristic of channel matrix and channel statistic property, and eliminate the pretreated effect of transmitting terminal, and noise is carried out albefaction handle, and carry out matched filtering to received signal.
Description of drawings
Below in conjunction with the detailed description of preferred embodiment of accompanying drawing to being adopted, above-mentioned purpose of the present invention, advantage and feature will become apparent by reference, wherein:
Fig. 1 is the schematic diagram that shows the mimo system structure of traditional employing AMC technology;
Fig. 2 is the schematic diagram that shows according to the mimo system structure of the embodiment of the invention;
Fig. 3 is the refinement schematic diagram that shows according to the filter of the embodiment of the invention;
Fig. 4 is the flow chart that shows according to the adaptive transmission method of the embodiment of the invention;
Fig. 5 is the performance curve chart relatively that shows the method applied in the present invention and conventional method.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
Figure 2 shows that the mimo system schematic diagram that adopts the technology of the present invention.
Wherein, transmitting terminal and receiving terminal adopt n respectively TAnd n RIndividual antenna carries out the transmission and the reception of signal.At transmitting terminal, data to be sent at first are divided into L parallel data stream, L≤min{n through serial to parallel conversion device 101 T, n R.This L substream of data needed successively to change into n through adaptive modulation and coding device 102, power distribution unit 201 and pretreatment unit 202 before sending TThe road signal is again from transmitting terminal n TSend on the individual antenna.Here, L son flows modulation and coding parameter M={M required in adaptive modulation and coding 102 1, M 2..., M LCome from the in short-term feedback (here so-called in short-term feedback refer at each delivery time, such as each time slot all will feed back once) of receiving terminal by feedback channel 108.In addition, power distribution unit 201 and pretreatment unit 202 are realized by power division matrix P and preconditioning matrix T respectively.The purpose of power division matrix P is to be used for sending sub-stream to L to carry out power weightings, and P is the real positive definite diagonal matrix of L * L, can be expressed as P = diag { P 1 , P 2 , . . . , P L } , And satisfy Σ i = 1 L P i ≤ P total , P wherein iBe that i son stream is gone up the transmitted power of distributing, i=1,2 ..., L, P TotalFor sending the gross power restriction.Preconditioning matrix T is L * n TMatrix its objective is the deterioration for the systematic function that correlation is brought of resisting mimo channel.M is different with the adaptive modulation and coding parameter, feedback when parameter P and T all come from receiving terminal long (so-called here when long feedback refer to internal feedback for a long time once, the time interval of its feedback will be far longer than the feedback time interval in feeding back in short-term), and transmitting terminal calculates the gained results according to feedback result by long timed unit 203.
Receiving terminal is at first by n R Individual reception antenna 104 receives spacing wave, finishes following three part operations then:
(1) carries out channel estimating by channel estimating apparatus 105 according to this received signal, estimate current characteristic of channel matrix H.
Required parameter when (2) calculating next delivery time transmitting terminal and carry out Adaptive Transmission, and the parameter that will calculate gained sends it back transmitting terminal by feedback channel 108.Particularly, this step comprises:
(2.1) according to the result of channel estimating in calculating channel statistical property device 213 calculating channel statistical properties, and it is fed back to transmitting terminal.Because channel statistical characteristic itself is very slow over time, process when all being long to the calculating of channel statistical characteristic and feedback here therefore promptly calculate once in for a long time, and feedback once.
(2.2) characteristic of channel matrix H current according to the channel estimating gained, and the channel statistical characteristic of calculating gained are come modulation and coding parameter M={M that each son stream of next delivery time transmitting terminal is adopted 1, M 2..., M LChoose, this carries out in AMC selection of parameter device 214, and the M as a result after will choosing feeds back to transmitting terminal.Because characteristic of channel matrix H itself changes very fast, so be process in short-term to the calculating of parameter M and feedback here, promptly at short notice, such as all carrying out choosing and feeding back of M in each time slot.
(3) signal to current reception detects, comprising the function of filter 211 and MIMO checkout gear 212.Here, the purpose of filter 211 operations is in order to eliminate the pretreated effect of transmitting terminal, wherein to need to use current characteristic of channel matrix H and channel statistic property.Except H and channel statistical characteristic, also need to use modulation and the coding parameter information that each son stream of transmitting terminal is adopted in the MIMO checkout gear 212.Here, filter 211 can be refined as shown in Figure 3.
Figure 3 shows that the refinement signal of filter.
From realizing on the function that it comprises two parts operation: noise is carried out albefaction handle, and signal is carried out matched filtering.Wherein, can use weighted matrix R to the whitening filtering device 301 of noise n -1/2Describe, wherein R nBe the covariance matrix of receiving terminal additive noise, R nCan estimate to obtain by 213.Matched filtering process to received signal can be realized by device 302,303,304 and 305, promptly use matrix R respectively n -H/2, H H, T HAnd P HInput signal is carried out matched filtering, wherein () HThe conjugate transpose of representing matrix.
With the traditional MIMO-AMC structure among Fig. 1, promptly PARC compares, and adopts the main difference part of the MIMO-AMC system of the technology of the present invention to be:
(1) at transmitting terminal, the number that sends son stream is L, L≤min{n T, n R, can change in difference moment L numerical values recited, rather than the fixedly n that is adopted in the conventional P ARC system TIndividual transmission stream.In addition, transmitting terminal was taked power division 201 and preliminary treatment 202 operations to it before signal sends, also increased long timed unit 202 for this reason.Power distribution unit 201 and pretreatment operation device 202 required information come from the feedback of receiving terminal, but because it is process when long, be that power division matrix P and preliminary treatment T remain unchanged in long-time, therefore can not bring too much complexity and the increase on the feedback overhead for system.
(2), filter 211 and statistical property calculation element 213 have been increased at receiving terminal.The purpose of statistical property calculation element 213 is for transmitting terminal provides channel statistic property, is used for the power division and the pretreatment operation of transmitting terminal.Simultaneously,, therefore before carrying out the MIMO detection to received signal, must at first in filter 211, carry out the matched filtering operation to received signal, be used to offset the effect of transmitting terminal preliminary treatment signal because transmitting terminal has added pretreatment operation.
Particularly, the method that proposes among the present invention can be described by Fig. 4.
Figure 4 shows that the adaptive transmission method that invention is adopted.
Particularly, the realization of this method mainly comprises following step:
The first step: receiving terminal is estimated channel statistical characteristic R, and it is fed back to transmitting terminal, as S401.Specifically comprise:
(1.1) the covariance matrix R of additive noise n in the estimating received signal n, wherein n is a n RDimensional vector, R n=E{nn H, E{} is an expectation function.Can make the temporal R that on average obtains when long in the reality n
(1.2) estimate channel statistical characteristic R, wherein R=E{H HR n -1H}.
(1.3) R that will estimate gained sends it back transmitting terminal by feedback channel.
In second step, transmitting terminal is determined power division matrix P and preconditioning matrix T, as S411 according to R.This step is finished by the long timed unit 203 of transmitting terminal, and its specific implementation step comprises:
(2.1) determine L, wherein L is the parallel sub-flow amount that transmitting terminal sends.In the method, require L≤rank (R), wherein the order of rank () representing matrix.In this step, at first calculate rank (R), choose one by system then and be not more than the value of the positive integer of rank (R) as L.
(2.2) determine preconditioning matrix T.Concrete grammar is that R is carried out characteristic value decomposition (EVD), chooses the pairing characteristic vector of its maximum L characteristic value then, and this L characteristic vector formed L * n TPreconditioning matrix T.
(2.3) determine power division matrix P, can adopt two kinds of power distribution methods here:
(2.3.1) each son stream constant power distributes, promptly P = diag { P total / L , P total / L , . . . . , P total / L } , P wherein TotalFor sending the gross power restriction.
(2.3.2) based on the power distribution method of " water filling ".At first calculate maximum L the characteristic value of R in this method, be expressed as { λ 1, λ 2..., λ L, and obtain P i = ( &mu; - L&sigma; n 2 P total &lambda; i ) + , Wherein μ is a constant, function ( x ) + = x x &GreaterEqual; 0 0 x < 0 . Thus, obtaining the power division matrix is
P = diag { P 1 , P 2 , . . . . , P L } .
The 3rd step: receiving terminal is next data decimation that sends constantly modulation and coding parameter M={M 1, M 2..., M L, and it is fed back to transmitting terminal, as S402.Specifically comprise:
(3.1) according to current characteristic of channel matrix H, calculate each height stream 1,2 in advance ..., the equivalent SINR value SINR (1) of L after filtering and MIMO detection, SINR (2) ..., SINR (L).Its concrete grammar is the same with the process of calculating equivalent SINR among the PARC that introduces in the background technology, repeats no more here.But it should be noted that owing in this method to have added preliminary treatment and filter, so variation has just taken place in its equivalent channel matrix.Particularly, Ci Shi equivalent channel matrix has become H by the H among the conventional P ARC 0=P HT HH HR n -1HTP.That is to say that the H that calculates originally in the SINR formula all uses H 0Replace n TAll replace with L, such as, when adopting MMSE to detect, the SINR that k son flowed through after the detection is: SINR ( k ) = E s L N 0 [ H 0 * H 0 + N 0 / E s I L ] kk - 1 - 1 .
(3.2) according to the SINR (1) of gained, SINR (2) ..., SINR (L) is each height stream choice of modulation and coding parameter M={M 1, M 2..., M L.This step is the same with the conventional P ARC method of introducing in the background technology, repeats no more here.
(3.3) receiving terminal will be estimated each modulation of son stream and coding parameter M={M of gained 1, M 2..., M LSend it back transmitting terminal by feedback channel.
The 4th step: transmitting terminal is pressed the power division matrix P of gained, and preconditioning matrix T and modulation and coding parameter M carry out respective handling to the transmission data and send, as S412.Particularly, transmitting terminal is at first according to modulation and coding parameter M={M 1, M 2..., M LL the sub-stream of transmission is carried out adaptive modulation and coding, carry out power division and preliminary treatment respectively with matrix P and T then, at last from n TSend on the individual antenna.
The 5th step: after receiving terminal was received this signal, according to relevant parameter P, T and M carried out filtering and MIMO to received signal and detect, as S403.Specifically comprise:
(5.1) Filtering Processing is realized by filter 211.Supposing that received signal is y, so, is z=P through the output signal after the Filtering Processing HT HH HR n -1Y, wherein y is a n RDimensional vector, z are a L dimensional vector.
(5.2) signal to filtering output carries out the MIMO detection, can adopt any conventional MIMO detection method here.
The 6th step: judge whether to reappraise the channel statistical characteristic, if then forward the first step to, otherwise forwarded for the 3rd step to, as S404.
Because the channel statistical characteristic remains unchanged in long-time, be process when long to the estimation of channel statistical characteristic and feedback in the method therefore, promptly to carry out once for a long time, its concrete time span can be by system's initial setting.And for the 3rd step, be and send son stream choice of modulation and coding parameter, because the variation of H is very fast,, promptly in a short period of time, in a time slot, will carry out once so this operation is a process in short-term.
The performance that Figure 5 shows that the method applied in the present invention and conventional method compares.
Having provided the system throughput performance that adopts under conventional P ARC method and the inventive method in the emulation compares.Wherein, number of transmit antennas n TCount n with reception antenna RBe all 4, channel has adopted the flat Rayleigh fading channel.AMC has wherein adopted codeless Adaptive Modulation, and modulation parameter is respectively: " not passing ", BPSK, QPSK, 8PSK and 16QAM, target BER=10 -3In addition, sending correlation matrix is
R t = 1 0.76 e 0.17 &pi;j 0.43 e 0.35 &pi;j 0.25 e 0.53 &pi;j 0.76 e - 0.17 &pi;j 1 0.76 e 0.17 &pi;j 0.43 e 0.35 &pi;j 0.43 e - 0.35 &pi;j 0.76 e - 0.17 &pi;j 1 0.76 e 0.17 &pi;j 0.25 e - 0.53 &pi;j 0.43 e - 0.35 &pi;j 0.76 e - 0.17 &pi;j 1
Corresponding to antenna spacing among the ITU is λ/2, and transmission direction is 10 °, and angle spread is 15 ° a situation.Hypothesis receives irrelevant simultaneously.As seen from Figure 5, compare, adopt the method that proposes in the present patent application can obtain better throughput performance with conventional method.In addition, from the analysis of front as can be known, therefore feedback and calculating when power division that transmitting terminal increased in the inventive method and pretreatment parameter all come from system long can not bring too much feedback overhead and the increase on the implementation complexity for system.
Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by the foregoing description, and should be limited by claims and equivalent thereof.

Claims (8)

1. adaptive transmission method that uses in the space correlation multiple-input-multiple-output communication system comprises:
Receiving terminal is estimated the channel statistical characteristic and it is fed back to transmitting terminal;
The channel statistical characteristic that transmitting terminal comes according to feedback is determined power division matrix and preconditioning matrix;
Receiving terminal is determined modulation and coding parameter according to the characteristic of channel and is sent to transmitting terminal; And
Transmitting terminal carries out preliminary treatment and power division according to determined power division matrix and preconditioning matrix to sending signal, and according to the modulation that receives from receiving terminal and coding parameter to sending signal and modulate and encoding, so that launch described transmission signal by antenna
Wherein, described preconditioning matrix is after the channel statistical characteristic is carried out characteristic value decomposition, chooses its maximum L L * n that the pairing characteristic vector of characteristic value is formed TMatrix, wherein L is the parallel sub-flow amount that transmitting terminal sends, n TBe the transmitting antenna number,
Wherein, power division matrix and preconditioning matrix are that statistical property is determined during according to multiple-input and multiple-output correlated channels long.
2. method according to claim 1 is characterized in that: statistical property is R=E{H during described multiple-input and multiple-output correlated channels long HR n -1H}, wherein H is the multi-input multi-ouput channel feature matrix, R nBe the covariance matrix of additive noise n in the received signal, and E is the mathematic expectaion operator.
3. method according to claim 1 is characterized in that: receiving terminal determines that according to the characteristic of channel modulation and coding parameter and the step that sends to transmitting terminal comprise: determine described modulation and coding parameter according to the characteristic of channel in short-term.
4. method according to claim 2, it is characterized in that: described transmitting terminal during according to multiple-input and multiple-output correlated channels long statistical property to sending before signal carries out the step of preliminary treatment and power division, also comprise step: at first determine the parallel sub-flow amount L that transmitting terminal sends, L is chosen by system, and its value should be not more than the order of statistical property R when long.
5. according to any one the described method in the claim 1 to 4, it is characterized in that: the channel statistical characteristic that transmitting terminal comes according to feedback determines that the step of power division matrix comprises: determine the power division matrix according to the mode that constant power distributes and water injection power is distributed.
6. method according to claim 1, it is characterized in that also comprising: receiving terminal utilizes current characteristic of channel matrix and channel statistic property, eliminate the pretreated effect of transmitting terminal by filtering, and by filtering noise is carried out albefaction and handle, and carry out matched filtering to received signal.
7. Adaptive Transmission equipment that uses in the space correlation multiple-input-multiple-output communication system comprises:
Be arranged on the statistical property calculation element of receiving terminal, be used to estimate the channel statistical characteristic and it is fed back to transmitting terminal;
Be arranged on the long timed unit of transmitting terminal,, determine power division matrix and preconditioning matrix according to the channel statistical characteristic that feedback is come;
Be arranged on the modulation and the coding parameter selecting device of receiving terminal, be used for determining modulation and coding parameter and sending to transmitting terminal according to the characteristic of channel;
Be arranged on the power distribution unit of transmitting terminal, be used for carrying out preliminary treatment and power division to sending data according to determined power division matrix;
Be arranged on the pretreatment unit of transmitting terminal, be used for carrying out preliminary treatment to sending data according to determined preconditioning matrix; And
Be arranged on the modulation and the code device of transmitting terminal, modulation that feeds back according to receiving terminal and coding parameter be to sending signal and modulate and encode,
Wherein, described preconditioning matrix is after the channel statistical characteristic is carried out characteristic value decomposition, chooses its maximum L L * n that the pairing characteristic vector of characteristic value is formed TMatrix, wherein L is the parallel sub-flow amount that transmitting terminal sends, n TBe the transmitting antenna number,
Wherein, power division matrix and preconditioning matrix are that statistical property is determined during according to multiple-input and multiple-output correlated channels long.
8. equipment according to claim 7 is characterized in that also comprising:
Filter is used to utilize current characteristic of channel matrix and channel statistic property, eliminates the pretreated effect of transmitting terminal, and noise is carried out albefaction handle, and carries out matched filtering to received signal.
CN2005100893958A 2005-08-05 2005-08-05 Self-adapting transmission method and apparatus used in spacing related MIMO system Expired - Fee Related CN1909402B (en)

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