CN105007141A - Information transmission method for multi-user MIMO relay system - Google Patents

Abstract

The invention relates to an information transmission method for a multi-user MIMO relay system. The information transmission method comprises that: a first user sets a precoding matrix K according to CSI, wherein the precoding matrix K is provided with a twiddle factor matrix K used for selecting the alignment direction in the alignment space of an eigen direction when performing singular value decomposition (SCD) on a channel matrix; the first user processes pre-sending information according to the precoding matrix in order to form a sending matrix and sends the sending matrix to a relay; the first user receives a broadcast signal transmitted from the relay; and the first user processes the broadcast signal according to the precoding matrix in order to obtain information transmitted from multiple second users. The information transmission method designs the eigen direction alignment precoding and the twiddle factor matrix by means of the SVD, performs decoding by means of a simple ZF decoding algorithm so as to effectively improve decoding performance when good transmission channel relevance is provided, and has a physical layer safe transmission characteristic.

Description

The information transferring method of multiuser MIMO relay system

Technical field

The present invention relates to wireless communication technology field, particularly a kind of information transferring method of multiuser MIMO relay system.

Background technology

Multiple-input and multiple-output (Multiple-Input Multiple Output, be called for short MIMO) and relaying technique obtain as the important technical of G mobile communication (3G) and forth generation mobile communication technology (4G) and pay attention to widely, effectively can expand network coverage, improve network service quality.Install multiple antennas by user and relaying, play MIMO diversity, it is improve the important means of communication system that the advantages such as spatial reuse improve system transfers performance.

The method of many signal transacting is used in multiuser MIMO relay system to eliminate impact that common-channel interference brings thus to obtain better efficiency of transmission.When adopting ZF (Zero-Forcing detects ZF) decoding algorithm, when the independence of transmission channel is poor, can run into the problem that the small sample perturbations of result of calculation to primary data is very sensitive, this kind of problem is summed up as ill-condition matrix in matrix theory.The Degree of Ill Condition of channel matrix judges according to the conditional number of matrix, and conditional number is larger, and matrix is more ill.

In prior art, the patent No. is ZL201010199529.2, and patent name is in " information processing method of MIMO repeat broadcast system ", utilizes training sequence to adopt linear process to devise linear transfer scheme in MIMO relay system.This technology all obtains in the performance such as degree of freedom in system and decoding complexity must be improved, and system transfers quality is promoted.In addition, technical literature Cadambe V R, Jafar S A. " Interference alignment and degrees of freedom of theK-user interference channel, " Information Theory, IEEE Transactions on, 54 (8): 3425-3441, 2008. (" the interference alignment of K user's interference channel and degree of freedom in system " IEEE information theory periodicals, 54th volume, 8th phase, the page number: 3245-3441, 2008) in, adopt the method for interference alignment that degree of freedom in system is improved when signal transacting, but but can only equip an antenna for each user.Moreover, Lee, N., J.-B.Lim, and H.Chun, " Degrees of freedom of theMIMO Y channel:Signal space alignment for network coding, " IEEE Trans.Inform.Theory, Vol.56, No.7, 3332-3342, Jul.2010. (" degree of freedom in system of MIMO Y-channel: the network code adopting signal space alignment " IEEE information theory periodical, 56th volume, 7th phase, the page number: 3332-3342, 2010), this article improves interference alignment and proposes signal space alignment, further increase degree of freedom in system and be applicable to multiple antennas network, but signal space alignment has high restriction requirement for user and number of antennas, practicality is not high, fail to relate to safety of physical layer simultaneously.Moreover, technical literature Tao Yang, Xiaojun Yuan, Li Ping, Iain B.Collings and Jinhong Yuan, " A neweigen-direction alignment algorithm for physical-layer network coding in MIMO two-way relaychannels ", Proceedings of the 2011 IEEE International Symposium on Information Theory-ISIT, p 2253-7, 2011 (" network coding scheme of a kind of new feature based direction alignment under MIMO bidirectional relay channel " IEEE international information opinion meetings, 2011) signal processing method utilizing characteristic direction to align is proposed in, improve the restriction requirement of signal space to number of antennas, but this article is only applicable to bidirectional relay system, the multidirectional trunk channel transmission of multi-user can not be applicable to.

To sum up, prior art still has the following disadvantages: in the information transmission of (1) multiuser MIMO relay system, when transmission channel correlation is stronger, decoding performance cannot ensure, especially when relaying uses ZF (ZF) decoding, if channel matrix is not ideal enough will have power loss; (2), in the information transmission of multiuser MIMO relay system, safety of physical layer is not considered.

Summary of the invention

Therefore, based on the deficiency that prior art exists, the invention provides a kind of information transferring method of multiuser MIMO relay system, comprising:

First user arranges pre-coding matrix F according to channel condition information CSI _m, described pre-coding matrix F _min be provided with rotated factor matrix K, described rotated factor matrix K be used for channel matrix H _min the alignment space of characteristic direction, alignment direction is selected when doing singular value decomposition;

Described first user is according to described pre-coding matrix F _mprocess is carried out to pre-transmission information and forms sending metrix X _m, and by described sending metrix X _msend to relaying;

Described first user receives the broadcast singal X sent by described relaying _r; And

Described first user is according to decoding matrix P _mto described broadcast singal X _rcarry out the information processing to obtain multiple second user's transmission.

The present invention also provides a kind of information transferring method of multiuser MIMO relay system, comprising:

The sending metrix X that relay reception first user and multiple second user send _m; Described sending metrix X _mthe pre-coding matrix F arranged according to channel condition information CSI by described first user or described second user _mprocess formation is carried out to pre-transmission information;

Described relaying is to multiple described sending metrix X _mcarry out coding and form coding strand Y _r;

Described relaying is to described coding strand Y _radopt physical layer encodes to map and form broadcast singal X _r; And

Described relaying sends described broadcast singal X to described first user and multiple described second user _r.

Beneficial effect:

The present invention decomposes by adopting SVD, and the alignment precoding of design feature direction and rotated factor matrix, adopt simple ZF decoding algorithm to decode simultaneously, make, when transmission channel correlation is stronger, effectively to improve decoding performance; There is safety of physical layer transmission characteristic simultaneously.

By the detailed description below with reference to accompanying drawing, other side of the present invention and feature become obvious.But it should be known that this accompanying drawing is only the object design of explanation, instead of as the restriction of scope of the present invention, this is because it should with reference to additional claim.Should also be appreciated that, unless otherwise noted, unnecessaryly draw accompanying drawing to scale, they only try hard to structure described herein and flow process are described conceptually.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.

Fig. 1 is the structural representation of a kind of multiuser MIMO relay system of the embodiment of the present invention;

Fig. 2 is the signaling process figure of a kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention;

Fig. 3 is the flow chart of a kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention;

Fig. 4 is the flow chart of the another kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention;

Fig. 5 is the graph of a relation that the channel matrix conditional number of a kind of multiuser MIMO relay system of the embodiment of the present invention and channel rotate postcondition number.

Embodiment

For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of a kind of multiuser MIMO relay system of the embodiment of the present invention.As shown in Figure 1, multiuser MIMO relay system of the present invention, comprise multiple user and at least one relaying, and M user respectively equips n _troot antenna; Relaying equipment n _rroot antenna.In multiple access access channel (MAC) stage, each user sends modulation signal to other all users; At broadcast phase (BC), the signal sent by other users of relay reception.The channel of user and relay well is all Rayleigh flat decline.

It should be noted that, in following examples of the present invention, first user and the second user are same subscriber equipment, just arrange for the ease of clear description.Namely be understandable that, the relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and does not require to exist between these entities or operation the relation or sequentially of any reality.In addition, user 1 ..., user m ..., user M is also for refer to same subscriber equipment with first user and the second user, only this classification is used for convenient description formula and arranges, that is, first user can be user 1 ..., user m ..., any one in user M, and the second user also can be user 1 ..., user m ..., in user M be different from outside first user any one.

Embodiment one

Refer to Fig. 2, Fig. 2 is the signaling process figure of a kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention, and the multiuser MIMO relaying system information transmission method of the present embodiment is specially:

S101, first user arrange pre-coding matrix F according to channel condition information (Channel state information is called for short CSI) _m.

The generation of pre-coding matrix is specific as follows:

H _m(m=1,2 ..., M) channel matrix between representative of consumer m and relaying, SVD is done respectively to all channel matrixes and decomposes, and set gradually pre-coding matrix F _m.

S102, first user utilize pre-coding matrix to carry out coding to user message and form sending metrix X _m.

Due to the effect of pre-coding matrix, sending metrix X _mthe interference that other users bring can be eliminated.

The generation of first user sending metrix is specific as follows:

According to gained pre-coding matrix F _m, calculate sending metrix X _mas follows:

X _m＝F _mc _m……(1)

Wherein, c _mfor message vector to be sent.

S103, first user send the sending metrix X self generated to relaying _m.

Each user of S104, relay reception mails to the mixed signal of relaying, forms coding strand by channel allocation matrix.

S105, relaying carry out calculating by physical-layer network coding mapping pair coding strand and form broadcast singal X _r.

Relaying calculates repeat broadcast according to Received signal strength and sends signal X _r.

S106, relaying send broadcast singal X to first user _r.

And retransmit is sent to each user at next time slot.

S107, first user process to broadcast singal the information obtaining at least one second user's transmission according to pre-coding matrix.

Each user receives above-mentioned broadcast singal, utilizes and receives pre-coding matrix to the network code chain signal decoding through ZF decoding.At time slot, each user receives retransmit X _r, and utilize the expectation Received signal strength receiving pre-coding matrix acquisition user, and by the decruption key of self information as network code chain, the message that other user of decoding sends.

Embodiment two

Refer to Fig. 3, Fig. 3 is the flow chart of a kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention, the present embodiment on the basis of above-described embodiment, to user side multiuser MIMO relaying system information transmission method be described in detail.Concrete steps are as follows:

S201, first user arrange pre-coding matrix F according to CSI _m, pre-coding matrix F _min be provided with rotated factor matrix K, rotated factor matrix K be used for channel matrix H _mwhen doing singular value decomposition (Singular Value Decomposition is called for short SVD), in the alignment space of characteristic direction, select alignment direction.

S202, first user are according to pre-coding matrix F _mformation sending metrix X is carried out to pre-transmission information _m, and by sending metrix X _msend to relaying; And

S203, first user receive the broadcast singal X sent by relaying _r;

S204, first user are according to decoding matrix P _mto broadcast singal X _rcarry out the information processing to obtain multiple second user's transmission.

Particularly, in S201, each user arranges pre-coding matrix F according to CSI _m.

M is any one user in user 1 to user M, and user m is SVD to its channel matrix and decomposes:

$H_m=U_m{\mathrm{\Σ}}_m{V}_m^H......\left(2\right)$

Wherein U _mwith be unitary matrice and Σ _mit is the diagonal matrix of diagonal element descending.

When number of antennas meets n _t>=n _rand n _rduring=M-1, decompose the pre-coding matrix F arranged based on SVD _mas follows:

$F_m=V_m{\mathrm{\Σ}}_m^{-1}{U}_m^{H}K{\mathrm{\Ψ}}_m{A}_m......\left(3\right)$

Wherein, K is rotated factor matrix, rotate by carrying out necessary direction in the alignment space of characteristic direction, by selecting the compensation power loss as much as possible of rational alignment direction, overcome when the correlation of channel matrix is stronger, small evaluated error just can produce very large impact to decode results, and makes the problem that traditional Z F decoding algorithm lost efficacy. Σ _mpseudo inverse matrix.Ψ _mbe power division matrix, complete power optimization in the transmission and distribute.The present embodiment is not temporarily for consider the performance optimization that power division is brought, so here hypothesis adopts constant power allocative decision; A _mbe called channel allocation matrix, function is that scheduling equivalent channel achieves a butt joint to collect mail at relaying and number to carry out a network code for chain structure.A in pre-coding matrix _mcan subscriber signal be snapped on the direction of needs, the signal alignment of other users to other direction eliminates interference, the channel allocation matrix A therefore designed _mmake that there is fail safe.

The method that user m calculates rotated factor matrix K is as follows:

In order to compute matrix K, first define matrix G

$G\stackrel{\mathrm{\Δ}}{=}\underset{m=1}{\overset{M}{\mathrm{\Σ}}}{U}_m{\mathrm{\Σ}}_m^{-2}{U}_m^H......\left(4\right)$

Carry out feature decomposition to G to obtain:

$G=U_g{\mathrm{\Λ}}_g{U}_g^H......\left(5\right)$

Choose K=U _g

Constant power distributes in this embodiment, that is:

Ψ ₁＝Ψ ₂＝…＝Ψ _M＝I……(6)

The channel allocation matrix A of designing user m _mmethod is as follows:

As m=1:

As 1 < m < M:

As m=M:

In S202, each user calculates gained pre-coding matrix F before utilizing _m, calculate user's sending metrix X _m.Due to the effect of pre-coding matrix, user's sending metrix can eliminate the interference that channel and other users bring.

The generation that user sends message matrix is specific as follows:

According to S201, gained pre-coding matrix F is set _m, calculate user's sending metrix X _mas follows:

X _m＝F _mc _m……(10)

Wherein, c _mfor message vector to be sent, vector element is message to be sent and its copy, that is:

c _m＝[c _mc _m] ^T……(11)

In S204, each user receives above-mentioned broadcast singal X _r, and utilize decoding matrix P _mdecoding is carried out to network code signal.Wherein, reception decoding matrix P is utilized _mdecoding matrix based on Zero Forcing conversion carries out reception precoding to received signal.Wherein, decoding matrix P _malso be that formation is set according to CSI, and with pre-coding matrix F _mcomparing, is to pre-coding matrix F _mremoving channel allocation matrix A _mrear gained matrix carries out conjugate transpose, namely

As user m receives the signal of repeat broadcast transmission, and decoding obtains Received signal strength Y _m, its process is as follows:

$Y_m=H_m^H{X}_R+n_m......\left(12\right)$

Wherein, being down channel matrix, is up channel matrix conjugate transpose; n _mit is the additive white Gaussian noise vector of user m.

By decoding matrix P _m, obtain the message x that user m expects to receive _m.

$P_m={\left(V_m{\mathrm{\&Sigma;}}_m^{-1}{U}_m^{H}K{\mathrm{\&Psi;}}_m\right)}^H......\left(13\right)$

Its computational process is as follows:

$\begin{array}{c}{x}_m=P_m{Y}_m\\ ={\left(V_m{\mathrm{\&Sigma;}}_m^{-1}{U}_m^{H}K{\mathrm{\&Psi;}}_m\right)}^H(H_m^H{X}_R+n_m)\\ =K^H{X}_R+{\tilde{n}}_m\\ =K^{H}K\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{A}_i{c}_i+{\tilde{n}}_m\\ =\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{A}_i{c}_i+{\tilde{n}}_m\\ =\left[\begin{array}{c}{c}_1\&CirclePlus;c_2\\ c_2\&CirclePlus;c_3\\ ...\\ c_{i-1}\&CirclePlus;c_i\\ c_i\&CirclePlus;c_{i+1}\\ ...\\ c_{M-1}\&CirclePlus;c_M\end{array}\right]+{\tilde{n}}_m\end{array}......\left(14\right)$

Each user according to receive expectation message, the message sent as other user of secret key decryption by self information.

Above-mentioned user obtains other user, and to send message process specific as follows:

User m is by own message c _mas decruption key, calculate acquisition according to the coded message of decoding gained and close on user message c _m-1, c _m+1, its formula is as follows:

$c_{m-1}=(c_{m-1}\&CirclePlus;c_m)\&CirclePlus;c_m......\left(15\right)$

$c_{m+1}=(c_{m+1}\&CirclePlus;c_m)\&CirclePlus;c_m......\left(16\right)$

User m is again by message that similar procedure other users all that continuously decoding goes out to receive successively send.

The present embodiment, the present invention utilizes SVD to decompose, and the alignment precoding of design feature direction and rotated factor matrix, adopt simple ZF decoding algorithm to decode simultaneously.The method when transmission channel correlation is stronger, effectively can improve decoding performance; There is safety of physical layer transmission characteristic simultaneously.

Embodiment three

Refer to Fig. 4, Fig. 4 is the flow chart of a kind of multiuser MIMO relaying system information transmission method of the embodiment of the present invention, the present embodiment on the basis of above-described embodiment, to trunk side multiuser MIMO relaying system information transmission method be described in detail.Concrete steps are as follows:

The sending metrix X that S301, relay reception first user and multiple second user send _m; Sending metrix X _mthe pre-coding matrix F arranged according to channel condition information CSI by first user or the second user _mprocess formation is carried out to pre-transmission information

S302, relaying are to multiple sending metrix X _mcarry out coding and form coding strand Y _r.

Equally, relaying is according to channel allocation matrix A _mgenerate coding strand, channel allocation matrix A _meach signal is processed, signal is put into the direction of setting, be i.e. the channel allocation matrix A of designing user m _mmethod is as follows:

As m=1:

As 1 < m < M:

As m=M:

S303, relaying are to coding strand Y _radopt physical layer encodes to map and form broadcast singal X _r.

S304, relaying send broadcast singal X to first user and multiple second user _r.

Each user of relay reception mails to the mixed signal of relaying, the chain structure of tectonic network coding.

Particularly, in S302, the information that each user of relay reception sends, obtain relay reception signal and form coding strand, process is as follows:

$\begin{array}{c}{Y}_R=\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{H}_m{X}_m+n^R\\ =\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{H}_m{F}_m{c}_m+n_R\\ =\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{U}_m{\mathrm{\&Sigma;}}_m{V}_m^H{V}_m{\mathrm{\&Sigma;}}_m^{-1}{U}_m^{H}K{A}_m{c}_m+n_R\\ =K\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{A}_m{c}_m+n_R\\ =K\left[\begin{array}{c}{c}_1+c_2\\ c_2+c_3\\ ...\\ c_{m-1}+c_m\\ c_m+c_{m+1}\\ ...\\ c_{M-1}+c_M\end{array}\right]+n_R\end{array}......\left(17\right)$

Wherein, n _rit is relaying additive white Gaussian noise vector.

In S303, relaying calculates relaying according to Received signal strength and sends broadcast singal X _r, and by the broadcast singal X of relaying transmission _reach user is sent at next time slot.

The generation of relaying sending metrix is specific as follows:

Relaying, by decoding gained relay reception mixed signal, maps the broadcast singal X producing relaying by physical-layer network coding _ras follows:

X _R＝f(Y _R) ……(18)

Decoded signal is carried out physical-layer network coding modulation by relaying, obtains code signal: and at second all code signal of time slot broadcast transmission, wherein represent xor operation.

In this enforcement, the present invention adopts ZF decoding algorithm to carry out decoding to received signal.Because the direction of having carried out characteristic direction alignment space rotates, even if channel condition matrix is ill, also can effective compensation power loss, obtain good decoding performance.

Refer to Fig. 5, Fig. 5 is the graph of a relation that the channel matrix conditional number of a kind of multiuser MIMO relay system of the embodiment of the present invention and channel rotate postcondition number.Adopt rotated factor matrix, after rotating in characteristic direction alignment space, to the improvement degree of channel ill-condition matrix conditional number clearly.

To sum up, the embodiment of the present invention, in multiuser MIMO relaying system information transmitting procedure, is decomposed by adopting SVD, the alignment precoding of design feature direction and rotated factor matrix, adopt simple ZF decoding algorithm to decode simultaneously, make, when transmission channel correlation is stronger, effectively to improve decoding performance; There is safety of physical layer transmission characteristic simultaneously.

Apply specific case herein to set forth the principle of the information transferring method of multiuser MIMO relay system of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; to sum up, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.

Claims (10)

1. an information transferring method for multiuser MIMO relay system, is characterized in that, comprising:

First user arranges pre-coding matrix F according to channel condition information CSI _m, described pre-coding matrix F _min be provided with rotated factor matrix K, described rotated factor matrix K be used for channel matrix H _min the alignment space of characteristic direction, alignment direction is selected when doing singular value decomposition;

Described first user is according to described pre-coding matrix F _mprocess is carried out to pre-transmission information and forms sending metrix X _m, and by described sending metrix X _msend to relaying;

Described first user receives the broadcast singal X sent by described relaying _r; And

Described first user is according to decoding matrix P _mto described broadcast singal X _rcarry out the information processing to obtain multiple second user's transmission.

2. information transferring method as claimed in claim 1, it is characterized in that, first user arranges pre-coding matrix F according to channel condition information CSI _m, comprising:

Described first user does singular value decomposition to described channel matrix:

wherein, m is Customs Assigned Number, U _mwith for unitary matrice, Σ _mfor the diagonal matrix of diagonal element descending;

When number of antennas meets n _t>=n _rand n _rduring=M-1, described pre-coding matrix F _mfor:

wherein, M is total number of described multiple user, n _tfor each user configured antenna number, n _rfor the antenna number of described link deployment, for Σ _mpseudo inverse matrix, Ψ _mfor power division matrix, A _mfor channel allocation matrix.

3. information transferring method as claimed in claim 2, it is characterized in that, the computational methods of described rotated factor matrix K are:

Definition matrix G:

Feature decomposition is carried out to described matrix G:

Obtain described rotated factor matrix K:K=U _g.

4. information transferring method as claimed in claim 2, is characterized in that, described channel allocation matrix A _mfor:

As m=1:

As 1 < m < M:

As m=M:

5. information transferring method as claimed in claim 1, it is characterized in that, described first user is according to described pre-coding matrix F _mprocess is carried out to pre-transmission information and forms sending metrix X _m, comprising:

Described first user is according to described pre-coding matrix F _mcalculate described sending metrix X _m: X _m=F _mc _m; Wherein, c _mfor the vector of described pre-transmission information.

6. information transferring method as claimed in claim 1, it is characterized in that, described first user is according to decoding matrix P _mto described broadcast singal X _rcarry out the information processing to obtain multiple second user's transmission, comprising:

Described first user is according to decoding matrix P _mto described broadcast singal X _rcarry out decoding;

Described first user is to described broadcast singal X _rdecoding obtains Received signal strength Y _m: wherein, for down channel matrix, n _mit is the additive white Gaussian noise vector of user m;

Described first user is according to described decoding matrix P _mobtain coded message: wherein, Ψ _mfor power division matrix, for the diagonal matrix Σ of diagonal element descending _mpseudo inverse matrix.

7. an information transferring method for multiuser MIMO relay system, is characterized in that, comprising:

The sending metrix X that relay reception first user and multiple second user send _m; Described sending metrix X _mthe pre-coding matrix F arranged according to channel condition information CSI by described first user or described second user _mprocess formation is carried out to pre-transmission information;

Described relaying is to multiple described sending metrix X _mcarry out coding and form coding strand Y _r;

Described relaying is to described coding strand Y _radopt physical layer encodes to map and form broadcast singal X _r; And

Described relaying sends described broadcast singal X to described first user and multiple described second user _r.

8. information transferring method as claimed in claim 6, is characterized in that, arrange pre-coding matrix F according to channel condition information CSI _m, comprising:

Described first user does singular value decomposition to described channel matrix: wherein, m is Customs Assigned Number, U _mwith for unitary matrice, Σ _mfor the diagonal matrix of diagonal element descending;

When number of antennas meets n _t>=n _rand n _rduring=M-1, described pre-coding matrix F _mfor: in its m, M is total number of described multiple user, n _tfor each user configured antenna number, n _rfor the antenna number of described link deployment, for Σ _mpseudo inverse matrix, Ψ _mfor power division matrix, A _mfor channel allocation matrix.

9. information transferring method as claimed in claim 6, is characterized in that, described pre-coding matrix F _min be provided with rotated factor matrix K, described rotated factor matrix K be used for channel matrix H _min the alignment space of characteristic direction, alignment direction is selected when doing singular value decomposition; Wherein, the computational methods of described rotated factor matrix K are:

Definition matrix G:

Feature decomposition is carried out to described matrix G:

Obtain described rotated factor matrix K:K=U _g.

10. information transferring method as claimed in claim 6, is characterized in that, form described coding strand Y _rprocess be:

Wherein, m is Customs Assigned Number, U _mwith for unitary matrice, Σ _mfor the diagonal matrix of diagonal element descending, for Σ _mpseudo inverse matrix, Ψ _mfor power division matrix, A _mfor channel allocation matrix, n _rfor relaying additive white Gaussian noise vector.