CN102647257B - Downlink signal preprocessing transmission method and device - Google Patents

Abstract

The invention discloses a downlink signal preprocessing transmission method and device. The downlink signal preprocessing transmission method comprises the following steps that: a transmission end i acquires a channel coefficient matrix Hi between the transmission end i and a user, wherein Hi belongs to C<NR*NTi>, and represents a complex coefficient matrix, NR represents a receiving antenna number of the user, and NTi represents a transmission antenna number of the transmission end i; the transmission end i acquires an optimal precoding matrix Wi by utilizing the channel coefficient matrix Hi, wherein Wi belongs to C<NR*di> and represents the complex coefficient matrix, and di represents a transmission data stream number of the transmission end I; and the transmission end i calculates a rotation matrix Ui of the transmission end by utilizing all acquired channel coefficient matrixes H1,..., the precoding matrixes W1,..., Wi, and the rotation matrixes U1,..., Ui-1 in mutually cooperative transmission ends, wherein the rotation matrix is U1 and is a unit matrix when i is equal to 1; the transmission end calculates a final precoding matrix W<new>i=WiUi according to the precoding matrix Wi and the rotation matrix Ui; and preprocessing the transmitted data, and transmitting the data through an antenna interface. The method and device disclosed by the invention have the advantages of reducing the interference of a cell edge, improving the frequency spectrum efficiency of the cell edge and increasing the effectively coverage range of a cell.

Description

A kind of downstream signal preliminary treatment sending method and device

Technical field

The present invention relates to the communications field, more specifically, relate to a kind of downstream signal preliminary treatment sending method and device.

Background technology

Traditional cellular type network topological structure is the point-to-multipoint transmission mode that a transmitting terminal serves multiple user, and concerning the user of cell edge, this transmission mode also exists larger minizone co-channel interference.The method of current solution Cell Edge User minizone co-channel interference can combine multiple transmitting terminal, mutually cooperates, interference signal is become useful signal between transmitting terminal.We are multiple adjacent transmitting terminal (can be base station, relaying, radio frequency extension apparatus etc.) and the problem of multiple user terminal at the enterprising Serial Communication of identical running time-frequency resource, be called multicast communication technology (as shown in Figure 1), it comprises cooperative multipoint transmission (Comp) technology and distributed precoding technology (Distributed Precode Scheme:DPS), and wherein cooperative multipoint transmission comprises cooperative beam shaping (CB) and Combined Treatment technology (JP).

Multicast communication technology, although it can obtain comparatively excellent data transmission performance, but each base station participating in cooperation needs to obtain the channel information between each user to all cooperative base station, the transmission quantity of its information is very large, this is being difficult to of a task to the interface of up channel and transmitting terminal (base station), so in practice, people often have to take the second best excellent data transfer mode, namely each cooperative base station only obtains channel information (the i.e. so-called local message of all users to oneself, Local CSI), then this information is utilized to carry out optimum precoding processing, to reach the object that transmission was avoided and maximized in interference.

In a distributed pre-coding system, the cooperation set be made up of N number of cooperation transmitting terminal , they transmit data for K user simultaneously, and the data that so user k receives can be expressed as:

$Y_k=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{H}_{i,k}{W}_{i,k}{s}_k+\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j=1,j\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{H}_{i,j}{W}_{i,j}{s}_j+n_k---\left(1\right)$

Wherein represent the channel coefficient matrix between i-th transmitting terminal to a kth user, represent the pre-coding matrix between i-th transmitting terminal to a kth user, d _krepresent the number of data streams that user k is corresponding, wherein represent the desired signal of user k, s _krepresent that cooperation transmitting terminal sends to the data of user k, represent the noise of user k, represent the interference of other user that user k is subject to, wherein, k=1 ..., K.

For such distributed precoding system, can its key that obtain outstanding receptivity be, the expectation Received signal strength item of user k whether coherence's merging can be carried out, i.e. H _{i, k}w _{i, k}s _k, i=1 ..., N, can cophase stacking, makes value maximum may cause cancelling out each other because be directly superimposed with between plural number, thus make gain impaired, when only having the plural number superposition of same phase, the multiple sending end of acquisition that can be real cooperates the merging gain brought, here, k=1 ..., K.

Thus, in order to enable user k receiver side to received signal in desired signal components carry out relevant merging, the transmitting terminal of multiple cooperation needs to carry out phase rotating to transmitting, and thus formula (1) becomes

$Y_k=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{H}_{i,k}{W}_{i,k}{U}_{i,k}{s}_k+\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j=1,j\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{H}_{i,j}{W}_{i,j}{U}_{i,j}{s}_j+n_k---\left(2\right)$

Wherein, U _{i, k}represent the phase rotation matrix between i-th transmitting terminal to a kth user, k=1 ..., K, other meaning of parameters is identical with the parameter in expression formula (1).And the acquisition of spin matrix, be related to receiving terminal and the relevant effect merged is carried out to cooperation transmitting terminal data, decide the performance of distributed precoding to a great extent, therefore the present invention aims to provide a kind of method obtaining spin matrix, to solve the relevant problem merged in multicast communication technology, and then reduce the problem of co-channel interference in communication system.

Summary of the invention

The invention provides a kind of downstream signal preliminary treatment sending method and device, with at least by solving the relevant problem that merges in multicast communication technology thus finally solving the problem reducing co-channel interference in system transfers process.

According to an aspect of the present invention, provide a kind of downstream signal preliminary treatment sending method, the method comprises:

(1) transmitting terminal i obtains the channel coefficient matrix H between it and user _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i;

(2) transmitting terminal i utilizes channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, d _irepresent the transmission number of data streams of transmitting terminal i;

(3) transmitting terminal i utilizes all channel coefficient matrix H obtained in co-operating transmitting terminal ₁..., H _i, pre-coding matrix W ₁..., W _i, spin matrix U ₁..., U _i-1calculate the spin matrix U of this transmitting terminal _i, wherein, as i=1, spin matrix is U ₁, be a unit matrix;

(4) transmitting terminal is according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix

$W_i^{\mathrm{new}}=W_i{U}_i;$

(5) described in using preliminary treatment is carried out to the data sent, and is sent by antenna port.

According to a further aspect in the invention, provide a kind of downstream signal preliminary treatment dispensing device, this device comprises:

Channel coefficient matrix acquisition module, for the channel coefficient matrix between the transmitting terminal that obtains cooperation to user;

Pre-coding matrix acquisition module, for the pre-coding matrix between the transmitting terminal that obtains cooperation to user;

Spin matrix acquisition module, is positioned at the transmitting terminal of each cooperation, or controls on the controller of cooperation transmitting terminal, for the spin matrix between the transmitting terminal that obtains cooperation to user;

Precoding update module, is positioned at the transmitting terminal of each cooperation, for the pre-coding matrix between the transmitting terminal that upgrades cooperation to user;

Data transmission blocks, it obtains pre-coding matrix from precoding update module, and is sent by antenna port after this pre-coding matrix is carried out preliminary treatment to the data sent.

By above technical scheme, the present invention is mainly by obtaining phase rotation matrix, receiving terminal can be made to carry out effective relevant merging to the signal that multiple transmitting terminal sends, thus efficiently utilize multicast communication technology, reduce the interference of cell edge, improve cell edge spectrum efficiency, add the effective coverage range of community.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 shows and relates to the multicast communication technology schematic diagram relevant with technical solution of the present invention application scenarios;

Fig. 2 shows the flow chart of downstream signal preliminary treatment sending method of the present invention.

Fig. 3 shows the pretreated device schematic diagram of downstream signal of the present invention.

Embodiment

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.As shown in Figure 2, technical solution of the present invention mainly comprises:

Step S1, transmitting terminal i obtain the channel coefficient matrix H between it and user _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i;

Step S2, transmitting terminal i utilize channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, d _irepresent the transmission number of data streams of transmitting terminal i.

Step S3, transmitting terminal i utilize all channel coefficient matrix H obtained in co-operating transmitting terminal ₁..., H _i, pre-coding matrix W ₁..., W _i, spin matrix U ₁..., U _i-1calculate the spin matrix U of this transmitting terminal _i, wherein, as i=1, spin matrix is U ₁, be a unit matrix;

Step S4, transmitting terminal are according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix

Described in step S5, use preliminary treatment is carried out to the data sent, and is sent by antenna port.

Further, spin matrix U is obtained in step S3 _ifirst method as follows,

A () calculates split-matrix

B () is to G _icarry out QR decomposition, i.e. G _i=Q _ir _i

C () calculates U _i, i.e. U _i=Q _id _i.

Here, D _ifor the element on diagonal is the diagonal matrix of+1 or-1, namely

Wherein, represent D _ithe element of the capable n row of m, r _mmfor matrix R _ithe element of m capable m row.≠ expression is not equal to, () ^hthe conjugate transpose of representing matrix, m, n=1 ..., d _i, d _ifor the number of data streams that cooperation transmitting terminal i sends.

Step S3 is in cooperation transmitting terminal number N=2, and during the data fluxion d=2 sent, the second method obtaining spin matrix is as follows,

$U_1=\left(\begin{array}{cc}1& 0\\ 0& 1\end{array}\right),U_2=\left(\begin{array}{cc}{e}^{-j{\mathrm{\&theta;}}_{11}}& 0\\ 0& e^{-j{\mathrm{\&theta;}}_{22}}\end{array}\right),$

Wherein, be respectively matrix the real part of the 1st row 1 column element and imaginary part. be respectively matrix the real part of the 2nd row 2 column element and imaginary part.Arctan () represents arctan function.

Step S3 is in cooperation transmitting terminal number N=2, and during the data fluxion d=2 sent, the third method obtaining spin matrix is as follows,

$U_1=\left(\begin{array}{cc}1& 0\\ 0& 1\end{array}\right),U_2=\left(\begin{array}{cc}{e}^{j{\mathrm{\&theta;}}_1}& -e^{j{\mathrm{\&theta;}}_2}\\ e^{j{\mathrm{\&theta;}}_2}& e^{-j{\mathrm{\&theta;}}_1}\end{array}\right),$

Wherein, δ ₁value is 0 or 1; δ ₂value is 0 or 1; be respectively matrix the real part of the capable n column element of m and imaginary part, m, n=1,2.Arctan () represents arctan function.

Further, δ ₁and δ ₂value determine with the following method.

By δ ₁=0, δ ₂=0 or δ ₁=1, δ ₂=0 or δ ₁=0, δ ₂=1 or δ ₁=1, δ ₂θ in=1 four kind of situation ₁, θ ₂value, substitutes into following formula and the class value making following formula value maximum.

$f({\mathrm{\&theta;}}_1,{\mathrm{\&theta;}}_2)=(g_{11}^r+g_{22}^r)\cos \left({\mathrm{\&theta;}}_1\right)+(-g_{11}^i+g_{22}^i)\sin \left({\mathrm{\&theta;}}_1\right)+(g_{12}^r-g_{21}^r)\cos \left({\mathrm{\&theta;}}_2\right)-(g_{12}^i+g_{21}^i)\sin \left({\mathrm{\&theta;}}_2\right)$

Wherein, be respectively matrix the real part of the capable n column element of m and imaginary part, m, n=1,2.

Embodiment 1

In a distributed pre-coding system, have the base station of N number of cooperation, they transmit data for K user simultaneously, and the data flow number of transmission is d _k.For each user k, k=1 ..., K, the base station i of each cooperation, i=1 ..., N proceeds as follows respectively, with the distributed precoding matrix that the user k obtaining its service is corresponding, and sends after carrying out preliminary treatment with pre-coding matrix to transmission data.

(1) transmitting terminal i obtains the channel coefficient matrix H between it and user _i, wherein complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i.

(2) transmitting terminal i utilizes channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, d _irepresent the transmission number of data streams of transmitting terminal i.

W _ican be the matrix selecting to get from codebook set W, it can make maximum.Wherein, representing matrix determinant, the conjugate transpose of subscript H representing matrix.

(3) if i=1, it is U that base station i calculates spin matrix ₁, U ₁a d _k× d _kunit matrix; Otherwise transmitting terminal utilizes all channel information H obtained in co-operating transmitting terminal ₁..., H _i, pre-coding matrix W ₁..., W _i, spin matrix U ₁..., U _i-1calculate the spin matrix U of this transmitting terminal _i.Its calculation procedure is as follows

(3.1) split-matrix is calculated,

(3.2) to G _icarry out QR decomposition, i.e. G _i=Q _ir _i

(3.3) U is calculated _i, i.e. U _i=Q _id _i.

Here, D _ifor the element on diagonal is the diagonal matrix of+1 or-1, namely

Wherein, represent D _ithe element of the capable n row of m, r _mmfor matrix R _ithe element of m capable m row.≠ expression is not equal to, () ^hthe conjugate transpose of representing matrix.

(4) transmitting terminal is according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix

$W_i^{\mathrm{new}}=W_i{U}_i.$

(5) use preliminary treatment is carried out to transmission data, and is sent by antenna port

Embodiment 2

In a distributed pre-coding system, have 2 base stations cooperated, they transmit data for K user simultaneously, and the data flow number d of transmission _k=2.For each user k, k=1 ..., K, the base station i of each cooperation, i=1,2 proceed as follows respectively, with the distributed precoding matrix that the user k obtaining its service is corresponding, and send after carrying out preliminary treatment with pre-coding matrix to transmission data.

(1) transmitting terminal i obtains the channel coefficient matrix H between it and user _i, wherein complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i.

(2) transmitting terminal i utilizes channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, d _irepresent the transmission number of data streams of transmitting terminal i.

W _ican be the matrix selecting to get from codebook set W, it can make maximum.Wherein, representing matrix determinant, the conjugate transpose of subscript H representing matrix.

(3) if i=1, calculating spin matrix is unit matrix otherwise spin matrix is

$U_2=\left(\begin{array}{cc}{e}^{-j{\mathrm{\&theta;}}_{11}}& 0\\ 0& e^{-j{\mathrm{\&theta;}}_{22}}\end{array}\right),$

Wherein, be respectively matrix the real part of the 1st row 1 column element and imaginary part. be respectively matrix the real part of the 2nd row 2 column element and imaginary part.Arctan () represents arctan function.

(4) transmitting terminal is according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix

(5) use preliminary treatment is carried out to transmission data, and is sent by antenna port.

Embodiment 3

In a distributed pre-coding system, have 2 base stations cooperated, they transmit data for K user simultaneously, and the data flow number d of transmission _k=2.For each user k, k=1 ..., K, the base station i of each cooperation, i=1,2 proceed as follows respectively, with the distributed precoding matrix that the user k obtaining its service is corresponding, and send after carrying out preliminary treatment with pre-coding matrix to transmission data.

(1) transmitting terminal i obtains the channel coefficient matrix H between it and user _i, wherein complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i.

(2) transmitting terminal i utilizes channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, d _irepresent the transmission number of data streams of transmitting terminal i.

W _ican be the matrix selecting to get from codebook set W, it can make maximum.Wherein, representing matrix determinant, the conjugate transpose of subscript H representing matrix.

(3) if i=1, calculating spin matrix is unit matrix otherwise spin matrix is

$U_2=\left(\begin{array}{cc}{e}^{j{\mathrm{\&theta;}}_1}& -e^{j{\mathrm{\&theta;}}_2}\\ e^{j{\mathrm{\&theta;}}_2}& e^{-j{\mathrm{\&theta;}}_1}\end{array}\right),$

Wherein, δ ₁value is 0 or 1; δ ₂value is 0 or 1.δ ₁and δ ₂value determine with the following method: by δ ₁=0, δ ₂=0 or δ ₁=1, δ ₂=0 or δ ₁=0, δ ₂=1 or δ ₁=1, δ ₂θ in=1 four kind of situation ₁, θ ₂value, substitutes into following formula and the class value making its value maximum,

$f({\mathrm{\&theta;}}_1,{\mathrm{\&theta;}}_2)=(g_{11}^r+g_{22}^r)\cos \left({\mathrm{\&theta;}}_1\right)+(-g_{11}^i+g_{22}^i)\sin \left({\mathrm{\&theta;}}_1\right)+(g_{12}^r-g_{21}^r)\cos \left({\mathrm{\&theta;}}_2\right)-(g_{12}^i+g_{21}^i)\sin \left({\mathrm{\&theta;}}_2\right)$

be respectively matrix the real part of the capable n column element of m and imaginary part, m, n=1,2.Arctan () represents arctan function.

(4) transmitting terminal is according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix

(5) use preliminary treatment is carried out to transmission data, and is sent by antenna port

It should be noted that, the method is except the part described in detail in an embodiment, and other is all the prior art that the technology of the present invention exercising ordinary skill can be known without creative work or be familiar with.

As shown in Figure 3, downstream signal preliminary treatment dispensing device provided by the invention comprises with lower module:

Channel coefficient matrix acquisition module 1 ', is positioned at the transmitting terminal of each cooperation, for the channel coefficient matrix between the transmitting terminal that obtains cooperation to user;

Pre-coding matrix acquisition module 2 ', is positioned at the transmitting terminal of each cooperation, for the pre-coding matrix between the transmitting terminal that obtains cooperation to user;

Spin matrix acquisition module 3 ', is positioned at the transmitting terminal of each cooperation, or controls on the controller of cooperation transmitting terminal, for the spin matrix between the transmitting terminal that obtains cooperation to user;

Precoding update module 4 ', is positioned at the transmitting terminal of each cooperation, for the pre-coding matrix between the transmitting terminal that upgrades cooperation to user;

Data transmission blocks 5 ', it obtains pre-coding matrix from precoding update module, and is sent by antenna port after this pre-coding matrix is carried out preliminary treatment to the data sent.

Transmitting terminal in the present invention can be the control appliance such as base station, relay station, radio frequency remote equipment in wireless communication system in down link.Similarly, user is the data-signal for receiving end/sending end, and user can be the terminal equipment in wireless communication system in up link, as mobile phone, notebook computer, Hand Personal Computer etc.And the method and apparatus in the present invention can be applicable to the wireless communication systems such as LTE and WIMAX.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a downstream signal preliminary treatment sending method, is characterized in that, comprising:

(1), transmitting terminal i obtains the channel coefficient matrix H between it and user _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i;

(2), transmitting terminal i utilizes channel coefficient matrix H _iobtain optimum pre-coding matrix W _i, wherein, complex coefficient matrix, d _irepresent the transmission number of data streams of transmitting terminal i;

(3), transmitting terminal i utilizes all channel coefficient matrix H obtained in co-operating transmitting terminal ₁..., H _i, pre-coding matrix W ₁..., W _i, spin matrix U ₁..., U _i-1calculate the spin matrix U of this transmitting terminal _i, wherein, as i=1, spin matrix is U ₁, be a unit matrix;

(4), transmitting terminal i is according to pre-coding matrix W _iand spin matrix U _icalculate final pre-coding matrix $W_i^{\mathrm{new}}=W_i{U}_i;$

(5), described in transmitting terminal i uses preliminary treatment is carried out to the data sent, and is sent by antenna port.

2. downstream signal preliminary treatment sending method according to claim 1, is characterized in that, in described step (2), and described W _ibe the matrix chosen from codebook set W, the condition of choosing is that it can make maximum, wherein, representing matrix determinant, the conjugate transpose of subscript H representing matrix.

3. downstream signal preliminary treatment sending method according to claim 1, is characterized in that, obtains spin matrix U in described step (3) _istep be:

(3a), split-matrix is calculated $G_i={\mathrm{\&Sigma;}}_{j=1}^{i-1}{U}_j^H\left(W_j^H{H}_j^H{H}_i{W}_i\right);$

(3b), to G _icarry out QR decomposition, i.e. G _i=Q _ir _i;

(3c), U is calculated _i, i.e. U _i=Q _id _i;

Wherein, described D _ifor the element on diagonal is the diagonal matrix of+1 or-1, namely

Described represent D _ithe element of the capable n row of m, r _mmfor matrix R _ithe element of m capable m row, () ^hthe conjugate transpose of representing matrix, m, n=1 ..., d _i, d _ifor the number of data streams that cooperation transmitting terminal i sends.

4. downstream signal preliminary treatment sending method according to claim 1, is characterized in that, in described step (3), when cooperation transmitting terminal number N=2, and during the data fluxion d=2 sent, obtains the acquisition spin matrix U of spin matrix _imethod be:

$U_1=\left(\begin{array}{cc}1& 0\\ 0& 1\end{array}\right),U_2=\left(\begin{array}{cc}{e}^{{-\mathrm{j\&theta;}}_{11}}& 0\\ 0& e^{-j{\mathrm{\&theta;}}_{22}}\end{array}\right),$

Wherein, ${\mathrm{\&theta;}}_{11}=\arctan \frac{g_{11}^i}{g_{11}^r},{\mathrm{\&theta;}}_{22}=\arctan \frac{g_{22}^i}{g_{22}^r},$ be respectively matrix the real part of the 1st row 1 column element and imaginary part, be respectively matrix the real part of the 2nd row 2 column element and imaginary part, arctan () represents arctan function.

5. downstream signal preliminary treatment sending method according to claim 1, is characterized in that, in described step (3), when cooperation transmitting terminal number N=2, and during the data fluxion d=2 sent, obtains the acquisition spin matrix U of spin matrix _imethod be:

$U_1=\left(\begin{array}{cc}1& 0\\ 0& 1\end{array}\right),U_2=\left(\begin{array}{cc}{e}^{{-\mathrm{j\&theta;}}_{11}}& {-e}^{j{\mathrm{\&theta;}}_2}\\ e^{{\mathrm{j\&theta;}}_2}& e^{-j{\mathrm{\&theta;}}_{22}}\end{array}\right),$

Wherein, ${\mathrm{\&theta;}}_1=\arctan \frac{{-g}_{11}^i+g_{22}^i}{g_{11}^r+g_{22}^r}+{\mathrm{\&delta;}}_1\mathrm{\&pi;}{,\mathrm{\&theta;}}_2=\arctan \frac{{-g}_{22}^i-g_{21}^i}{g_{22}^r-g_{22}^r}+,{\mathrm{\&delta;}}_2\mathrm{\&pi;},$ δ ₁value is 0 or 1, δ ₂value is 0 or 1, be respectively matrix the real part of the capable n column element of m and imaginary part, m, n=1,2, arctan () represents arctan function;

Wherein, described δ ₁and δ ₂for making cost function f (θ ₁, θ ₂) a maximum class value; Wherein cost function is:

$f({\mathrm{\&theta;}}_1,{\mathrm{\&theta;}}_2)=(g_{11}^r+g_{22}^r)\cos \left({\mathrm{\&theta;}}_1\right)+({-g}_{11}^i+g_{22}^i)\sin \left({\mathrm{\&theta;}}_1\right)+(g_{12}^r-g_{21}^r)\cos \left({\mathrm{\&theta;}}_2\right)-(g_{12}^i+g_{21}^i)\sin \left({\mathrm{\&theta;}}_2\right)$ Wherein, be respectively matrix the real part of the capable n column element of m and imaginary part, m, n=1,2.

6. downstream signal preliminary treatment sending method according to claim 1, it is characterized in that, described transmitting terminal i is base station, relay station or radio frequency extension apparatus, described user is used for the data-signal of receiving end/sending end, is the terminal equipment in up link in wireless communication system, mobile phone, notebook computer, Hand Personal Computer.

7. a downstream signal preliminary treatment dispensing device, is characterized in that, comprising:

Channel coefficient matrix acquisition module, for the channel coefficient matrix H between the transmitting terminal that obtains cooperation to user _i, wherein, complex coefficient matrix, N _rrepresent the reception antenna number of user, represent the transmitting antenna number of transmitting terminal i;

Pre-coding matrix acquisition module, for utilizing channel coefficient matrix H _ioptimum pre-coding matrix W between the transmitting terminal that acquisition cooperates to user _i, wherein, complex coefficient matrix, d _irepresent the transmission number of data streams of transmitting terminal i;

Spin matrix acquisition module, for utilizing all channel coefficient matrix H obtained in co-operating transmitting terminal ₁..., H _i, pre-coding matrix W ₁..., W _i, spin matrix U ₁..., U _i-1calculate and the transmitting terminal obtaining cooperation to the spin matrix U between user _i, wherein, as i=1, spin matrix is U ₁, be a unit matrix;

Precoding update module, for according to pre-coding matrix W _iand spin matrix U _icalculate and the transmitting terminal upgrading cooperation to the final pre-coding matrix between user

Data transmission blocks, for the pre-coding matrix that will upgrade sent by antenna port after preliminary treatment is carried out to the data sent.