CN102035624A - Pre-coding method and device based on dual-space time transmit diversity (STTD) system - Google Patents

Abstract

The embodiment of the invention discloses a pre-coding method and device based on a dual-space time transmit diversity (STTD) system, which relates to the technical field of wireless communication. The pre-coding method and device are invented for solving the problem of poor performance of the whole dual-STTD system because user signals generate mutual interference in the transmission process of a transmission channel in the prior art. The pre-coding method based on the dual-STTD system, which is provided by the embodiment of the invention, comprises the following steps: acquiring a transmission signal matrix and a channel matrix corresponding to the transmission signal matrix; diagonalizing the channel matrix to acquire a pre-coding matrix; and pre-coding transmission signals according to the pre-coding matrix acquired by diagonalizing the channel matrix. The embodiment of the invention realizes the purpose of improving the performance of the dual-STTD system.

Description

A kind of method for precoding and device based on two space-time transmit diversity systems

Technical field

The present invention relates to wireless communication technology field, relate in particular to a kind of method for precoding and device based on two space-time transmit diversity systems.

Background technology

At present, because D-STTD (Double Space-Time Transmission Diversity, two space-time emission diversities) technology has diversity in many antenna processing and multiplexing advantage concurrently, so in wireless communication system, obtained extensive use, for example: WiMAX (Worldwide Interoperability for Microwave Access, global intercommunication microwave access) wireless communication system or the like.Wherein, include transmitting terminal and receiving terminal in the described D-STTD system.Include 4 transmit antennas in the described transmitting terminal, include 2 reception antennas in the described receiving terminal.

Modeling in described D-STTD system is established channel and is changed in time slowly, and the channel in 2 time slots in front and back can be thought identical or approximately uniform.Therefore the signal r that receives in receiving terminal can be expressed as:

$r=\left[\begin{array}{cccc}{h}_{11}& h_{12}& h_{13}& h_{14}\\ -h_{12}^{*}& h_{11}^{*}& -h_{14}^{*}& h_{13}^{*}\\ h_{21}& h_{22}& h_{23}& h_{24}\\ -h_{22}^{*}& h_{21}^{*}& -h_{24}^{*}& {\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}\end{array}\right]\left[\begin{array}{c}{s}_1\\ s_2\\ s_3\\ {\mathrm{<figure-callout\; id="4"\; label="s"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">s</figure-callout>}}_4\end{array}\right]+n$

$=\left[\begin{array}{cc}{H}_{11}& H_{12}\\ H_{21}& H_{22}\end{array}\right]s+n$

$=\mathrm{Hs}+n---\mathrm{1.1.1}$

Wherein:

$\begin{array}{cc}{H}_{11}=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ -h_{12}^{*}& h_{11}^{*}\end{array}\right]& H_{12}=\left[\begin{array}{cc}{h}_{13}& h_{14}\\ -h_{14}^{*}& h_{13}^{*}\end{array}\right]\end{array}$

$\begin{array}{cc}{H}_{21}=\left[\begin{array}{cc}{h}_{21}& h_{22}\\ -h_{22}^{*}& h_{21}^{*}\end{array}\right]& H_{22}=\left[\begin{array}{cc}{h}_{23}& h_{24}\\ -h_{24}^{*}& {\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}\end{array}\right]\end{array}---\mathrm{1.1.2}$

Described formula (1.1.2) is each submatrix of channel matrix H, and each submatrix all is an orthogonal matrix;

h _IjBe channel response from j transmitting antenna to i reception antenna, i ∈ (1,2) wherein, j ∈ (1,2), [a] * represents the conjugation of [a];

S=[s ₁s ₂s ₃s ₄] ^TBe through the subscriber signal after coding and the modulation, [a] ^TThe transposition of expression [a];

N is that variance is σ ²The white Gaussian noise signal.

In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem:

The signal r that described receiving terminal receives because mutual interference mutually can take place in described subscriber signal s1 and s2, s3 and s4 in the process of transmission channel H transmission, even when transmitting terminal known channel matrix, the performance of described whole D-STTD system also difficulty reach optimum.

Summary of the invention

The embodiment of the invention provides a kind of method for precoding and device based on two space-time transmit diversity systems, to realize that channel matrix when transmitting terminal is known, improves the performance of D-STTD system.

For achieving the above object, embodiments of the invention adopt following technical scheme:

On the one hand, the embodiment of the invention provides a kind of method for precoding based on two space-time transmit diversity systems; Described method for precoding comprises:

Obtain transmit matrix and corresponding channel matrix thereof;

Described channel matrix is carried out diagonalization handle, obtain pre-coding matrix;

Handle the accessed pre-coding matrix in back according to described channel matrix diagonalization, carry out precoding processing to transmitting.

On the other hand, the embodiment of the invention provides a kind of pre-coding apparatus based on two space-time transmit diversity systems; Described pre-coding apparatus comprises:

The matrix acquiring unit is used to obtain transmit matrix and corresponding channel matrix thereof;

The diagonalization processing unit is used for that described channel matrix is carried out diagonalization and handles, and obtains pre-coding matrix;

The precoding processing unit is used for handling the accessed pre-coding matrix in back according to described channel matrix diagonalization, carries out precoding processing to transmitting.

A kind of method for precoding and device based on two space-time transmit diversity systems that the embodiment of the invention provides by obtaining transmit matrix and corresponding channel matrix thereof, and carry out diagonalization with described channel matrix and handle, and obtain pre-coding matrix; Make subscriber signal before the transmitting terminal emission, just can be according to the pairing channel matrix situation of the current matrix that transmits, to transmit and carry out precoding, the signal of eliminating described each interchannel disturbs, make the receiving terminal side joint receive after described the transmitting, need not to carry out again the signal interference processing of each interchannel, thereby improved the systematic function of two space-time transmit diversity systems greatly.

Description of drawings

The flow chart of a kind of method for precoding based on two space-time transmit diversity systems that Fig. 1 provides for the embodiment of the invention;

Fig. 2 for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of single user, based on the method for precoding flow chart of two space-time transmit diversity systems;

Fig. 3 for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems during for the two space-time transmit diversity systems of multi-user, based on the method for precoding flow chart of two space-time transmit diversity systems;

The structural representation of a kind of pre-coding apparatus based on two space-time transmit diversity systems that Fig. 4 provides for the embodiment of the invention;

Fig. 5 for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of single user, based on the structural representation of diagonalization processing unit described in the pre-coding apparatus of two space-time transmit diversity systems;

Fig. 6 for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems during for the two space-time transmit diversity systems of multi-user, based on the structural representation of diagonalization processing unit described in the pre-coding apparatus of two space-time transmit diversity systems;

The two space-time transmit diversity systems structural representations of a kind of single user that Fig. 7 provides for the embodiment of the invention;

The two space-time transmit diversity systems structural representations of a kind of multi-user that Fig. 8 provides for the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing a kind of method for precoding and device based on two space-time transmit diversity systems that the embodiment of the invention provides is described in detail.

As shown in Figure 1, be a kind of method for precoding based on two space-time transmit diversity systems that the embodiment of the invention provides, this method comprises:

101: transmitting terminal obtains transmit matrix and corresponding channel matrix thereof;

102: transmitting terminal carries out diagonalization with described channel matrix to be handled, and obtains pre-coding matrix; Wherein, the two kinds of situations that comprise are handled in described diagonalization: a kind ofly be the diagonalization processing procedure based on the two space-time transmit diversity systems of single user; Another kind is the diagonalization processing procedure based on the two space-time transmit diversity systems of multi-user.But the main process that described diagonalization is handled is: at first, obtain the submatrix of described channel matrix; Then, the submatrix of back-diagonal in the described channel matrix is carried out diagonalization handle, obtain first pre-coding matrix; Carry out singular value decomposition according to described first pre-coding matrix again, obtain second pre-coding matrix; At last, described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, obtain the pairing pre-coding matrix of described channel matrix information.

103: handle the accessed pre-coding matrix in back according to described channel matrix diagonalization, transmitting terminal carries out precoding processing to transmitting.Concrete implementation procedure is: described matrix and the described pre-coding matrix that gets access to of transmitting multiplied each other; Thereby obtain the precoding matrix that transmits and obtain transmitting after the precoding.

As shown in Figure 2, for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of single user, specific implementation process based on the method for precoding of described pair of space-time transmit diversity systems: wherein, the two space-time transmit diversity systems structures of described single user comprise a transmitting terminal and a receiving terminal that contains 2 reception antennas that contains 4 transmit antennas as shown in Figure 7; Matrix is s if its transmitting terminal transmits, and channel matrix is H.

201: transmitting terminal obtains transmit matrix and corresponding channel matrix thereof; Wherein, establish the described matrix s that transmits and be [s1 s2 s3 s4] ^TChannel matrix H is:

$H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& h_{13}& h_{14}\\ -h_{12}^{*}& h_{11}^{*}& -h_{14}^{*}& h_{13}^{*}\\ h_{21}& h_{22}& h_{23}& h_{24}\\ -h_{22}^{*}& h_{21}^{*}& -h_{24}^{*}& {\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}\end{array}\right]---\mathrm{2.2.1}$

202: transmitting terminal obtains the submatrix of described channel matrix; Described channel matrix H comprises: 4 submatrixs are H ₁₁, H ₁₂, H ₂₁, H ₂₂Be shown below:

$H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& h_{13}& h_{14}\\ -h_{12}^{*}& h_{11}^{*}& -h_{14}^{*}& h_{13}^{*}\\ h_{21}& h_{22}& h_{23}& h_{24}\\ -h_{22}^{*}& h_{21}^{*}& -h_{24}^{*}& {\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}\end{array}\right]$

$=\left[\begin{array}{cc}{H}_{11}& H_{12}\\ H_{21}& H_{22}\end{array}\right]---\mathrm{2.2.2}$

Wherein,

$\begin{array}{cc}{H}_{11}=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ -h_{12}^{*}& h_{11}^{*}\end{array}\right]& H_{12}=\left[\begin{array}{cc}{h}_{13}& h_{14}\\ -h_{14}^{*}& h_{13}^{*}\end{array}\right]\end{array}$

$\begin{array}{cc}{H}_{21}=\left[\begin{array}{cc}{h}_{21}& h_{22}\\ -h_{22}^{*}& h_{21}^{*}\end{array}\right]& H_{22}=\left[\begin{array}{cc}{h}_{23}& h_{24}\\ -h_{24}^{*}& {\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}\end{array}\right]\end{array}$

203: the submatrix of back-diagonal in the described channel matrix is carried out the diagonalization processing, obtain the first pre-coding matrix W1; Concrete diagonalization processing procedure is as follows: establish Then

$M=H_{11}^H{H}_{12}+H_{21}^H{H}_{22}$

$=\left[\begin{array}{cc}\mathrm{\&alpha;}& \mathrm{\&beta;}\\ -{\mathrm{\&beta;}}^{*}& {\mathrm{\&alpha;}}^{*}\end{array}\right]---\mathrm{2.2.3}$

$U_1=\frac{1}{\sqrt{{\left|\mathrm{\&alpha;}\right|}^2+{\left|\mathrm{\&beta;}\right|}^2}}*M^H,V_1=\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]---\mathrm{2.2.4}$

Wherein the value of each matrix element is as follows:

$\mathrm{\&alpha;}=h_{11}^{*}{h}_{13}+h_{12}{h}_{14}^{*}+h_{21}^{*}{\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}+h_{22}{h}_{24}^{*};$

$\mathrm{\&beta;}=h_{11}^{*}{h}_{14}-h_{12}{h}_{13}^{*}+h_{21}^{*}{h}_{24}-h_{22}{\mathrm{<figure-callout\; id="23"\; label="h"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">h</figure-callout>}}_{23}^{*}.$

Obtain W according to described 2.2.3 and 2.2.4 ₁:

$W_1=\left[\begin{array}{cc}{U}_1& 0_2\\ 0_2& V_1\end{array}\right]---\mathrm{2.2.5}$

Wherein, 0 ₂Null matrix for 2*2.

204: described channel matrix is carried out matrix operation according to described first pre-coding matrix; Its concrete processing procedure is:

If a=|h ₁₁| ²+ | h ₁₂| ²+ | h ₂₁| ²+ | h ₂₂| ²

b＝|h ₁₃| ²+|h ₁₄| ²+|h ₂₃| ²+|h ₂₄| ²；

$c=\sqrt{{\left|\mathrm{\&alpha;}\right|}^2+{\left|\mathrm{\&beta;}\right|}^2};$

${\left(H{W}_1\right)}^H*\left({\mathrm{HW}}_1\right)=\left[\begin{array}{cccc}a& 0& c& 0\\ 0& a& 0& c\\ c& 0& b& 0\\ 0& c& 0& b\end{array}\right]---\mathrm{2.2.6}$

205: will carry out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix, and obtain second pre-coding matrix; Concrete implementation procedure is:

Described formula 2.2.6 is carried out GSVD (General Singular Value Decomposition, generalized singular value decomposition) can be obtained:

Wherein:

Δ＝(a-b) ²+4c ²

$\begin{array}{cc}{\mathrm{\&lambda;}}_1=\frac{a+b-\sqrt{\mathrm{\&Delta;}}}{2}& {\mathrm{\&lambda;}}_2=\frac{a+b+\sqrt{\mathrm{\&Delta;}}}{2}\\ e=\frac{c}{\sqrt{{(a-{\mathrm{\&lambda;}}_1)}^2+c^2}}& g=\frac{{\mathrm{\&lambda;}}_1-a}{\sqrt{{(a-{\mathrm{\&lambda;}}_1)}^2+c^2}}\\ f=\frac{c}{\sqrt{{(a-{\mathrm{\&lambda;}}_2)}^2+c^2}}& h=\frac{{\mathrm{\&lambda;}}_2-a}{\sqrt{{(a-{\mathrm{\&lambda;}}_2)}^2+{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">c</figure-callout>}}^2}}\end{array}$

Can obtain W by following formula 2.2.6 and 2.2.7 ₂:

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\left[\begin{array}{cccc}e& 0& f& 0\\ 0& e& 0& f\\ g& 0& h& 0\\ 0& g& 0& h\end{array}\right]---\mathrm{2.2.8}$

206: described first pre-coding matrix W1 that obtains and the described second pre-coding matrix W2 are carried out matrix multiple, obtain the pairing pre-coding matrix W of described channel matrix information, i.e. W=W1W2.

207: described matrix s and the described pre-coding matrix W of transmitting multiplied each other;

208: obtain transmitting after the precoding thereby obtain the precoding matrix W s that transmits.

As shown in Figure 3, for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems during for the two space-time transmit diversity systems of multi-user, specific implementation process based on the method for precoding of described pair of space-time transmit diversity systems: wherein, the two space-time transmit diversity systems of described multi-user include a transmitting terminal and two receiving terminals as shown in Figure 8; Described transmitting terminal comprises 4 transmit antennas, and described receiving terminal comprises 2 reception antennas; Be located at and send 4 son streams in 2 continuous time slots, wherein, s ₁And s ₂Be to send to receiving terminal 1, s ₃And s ₄Be to send to receiving terminal 2; The transmitting terminal matrix that transmits is s, and the channel matrix between transmitting terminal and the receiving terminal 1 is H ⁽¹⁾, the channel matrix between transmitting terminal and the receiving terminal 2 is H ⁽²⁾

301: obtain transmit matrix and corresponding channel matrix thereof; Wherein, establish the described matrix s that transmits and be [s1 s2 s3 s4] ^TChannel matrix H ⁽¹⁾For:

$H^{\left(1\right)}=\left[\begin{array}{cccc}{h}_{11}^{\left(1\right)}& h_{12}^{\left(1\right)}& h_{13}^{\left(1\right)}& h_{14}^{\left(1\right)}\\ {-h}_{12}^{\left(1\right)*}& h_{11}^{\left(1\right)*}& {-h}_{14}^{\left(1\right)*}& h_{13}^{\left(1\right)*}\\ h_{21}^{\left(1\right)}& h_{22}^{\left(1\right)}& h_{23}^{\left(1\right)}& h_{21}^{\left(1\right)}\\ -h_{22}^{\left(1\right)*}& h_{21}^{\left(1\right)*}& -h_{24}^{\left(1\right)*}& h_{23}^{\left(1\right)*}\end{array}\right]$

Channel matrix H ⁽²⁾For:

$H^{\left(2\right)}=\left[\begin{array}{cccc}{h}_{11}^{\left(2\right)}& h_{12}^{\left(2\right)}& h_{13}^{\left(2\right)}& h_{14}^{\left(2\right)}\\ {-h}_{12}^{\left(2\right)*}& h_{11}^{\left(2\right)*}& -h_{14}^{\left(2\right)*}& h_{13}^{\left(2\right)*}\\ h_{21}^{\left(2\right)}& h_{22}^{\left(2\right)}& h_{23}^{\left(2\right)}& h_{21}^{\left(2\right)}\\ -h_{22}^{\left(2\right)*}& h_{21}^{\left(2\right)*}& {-h}_{24}^{\left(2\right)*}& h_{23}^{\left(2\right)*}\end{array}\right]$

302: the submatrix that obtains each user institute respective channels matrix in the two space-time transmit diversity systems of described multi-user; Wherein, described channel matrix H ⁽¹⁾Comprise: 4 submatrixs are H ⁽¹⁾ ₁₁, H ⁽¹⁾ ₁₂, H ⁽¹⁾ ₂₁, H ⁽¹⁾ ₂₂Be shown below:

Described channel matrix H ⁽²⁾Comprise: 4 submatrixs are H ⁽²⁾ ₁₁, H ⁽²⁾ ₁₂, H ⁽²⁾ ₂₁, H ⁽²⁾ ₂₂Be shown below:

Wherein:

Be the channel of j transmitting antenna to i reception antenna of k receiving terminal, j=1 ..., 4, i=1,2; K=1,2;

Be k the channel submatrix in the receiving terminal.

303: the submatrix on described each user institute respective channels matrix back-diagonal is carried out singular value decomposition, obtain first pre-coding matrix; Concrete diagonalization processing procedure is as follows:

If $T_{11}=H_{11}^{{\left(1\right)}^H}{H}_{12}^{\left(1\right)}+H_{21}^{{\left(1\right)}^H}{H}_{22}^{\left(1\right)};$ $T_{12}=H_{12}^{{\left(2\right)}^H}{H}_{12}^{\left(2\right)}+H_{21}^{{\left(2\right)}^H}{H}_{22}^{\left(2\right)};$

To T ₁₁And T ₁₂Carrying out GSVD decomposes and can obtain:

T ₁₁V ₁＝T ₁₂V ₁D ₁ 3.3.1

Wherein, V ₁Be the 2*2 matrix of a full rank,

It is a diagonal matrix.

Can obtain according to described formula 3.31:

$T_{12}{V}_1=\left[\begin{array}{cc}e& f\\ -f^{*}& e^{*}\end{array}\right]---\mathrm{3.3.2}$

Can obtain various from top:

W ₂₁＝V ₁

$W_{11}=\frac{1}{\sqrt{{\left|e\right|}^2+{\left|f\right|}^2}}\left[\begin{array}{cc}e& f\\ -f^{*}& e^{*}\end{array}\right]$

$W_1=\left[\begin{array}{cc}{W}_{11}& 0_2\\ 0_2& W_{21}\end{array}\right]$

304: described channel matrix is carried out matrix operation according to described first pre-coding matrix;

If $a_i={\left|h_{11}^{\left(i\right)}\right|}^2+{\left|h_{12}^{\left(i\right)}\right|}^2+{\left|h_{21}^{\left(i\right)}\right|}^2+{\left|h_{22}^{\left(i\right)}\right|}^2,i=\mathrm{1,2};$

$b_i={\left|h_{13}^{\left(i\right)}\right|}^2+{\left|h_{14}^{\left(i\right)}\right|}^2+{\left|h_{23}^{\left(i\right)}\right|}^2+{\left|h_{24}^{\left(i\right)}\right|}^2,i=\mathrm{1,2};$

${\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2=\sqrt{{\left|e\right|}^2+{\left|f\right|}^2,c_1={\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2\mathrm{\&phi;}{,\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">c</figure-callout>}}_2={\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2{\mathrm{\&phi;}}^{*}};$

${\left(H^{\left(1\right)}{W}_1\right)}^H{H}^{\left(1\right)}{W}_1=\left[\begin{array}{cccc}{a}_1& 0& c_1& 0\\ 0& a_1& 0& c_2\\ c_1^{*}& 0& b_1& 0\\ 0& {\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">c</figure-callout>}}_2^{*}& 0& b_1\end{array}\right]$

${\left(H^{\left(2\right)}{W}_1\right)}^H{H}^{\left(2\right)}{W}_1=\left[\begin{array}{cccc}{a}_2& 0& {\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2& 0\\ 0& a_2& 0& d_2\\ {\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2& 0& {\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">b</figure-callout>}}_2& 0\\ 0& {\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2& 0& b_2\end{array}\right]---\mathrm{3.3.3}$

305: will carry out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix, and obtain second pre-coding matrix; The concrete process of obtaining second pre-coding matrix is:

Described formula 3.3.3 is carried out GSVD (General Singular Value Decomposition, generalized singular value decomposition) can be obtained:

$\left\{\begin{array}{c}{T}_{21}=\begin{array}{}\end{array}\left[\begin{array}{cc}{a}_1& c_1\\ c_1^{*}& b_1\end{array}\right]\\ T_{22}=\left[\begin{array}{cc}{a}_2& d_2\\ d_2& {\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">b</figure-callout>}}_2\end{array}\right]\end{array}\right.\&DoubleRightArrow;\left\{\begin{array}{c}{T}_{21}{V}_{21}=T_{22}{V}_{21}{D}_{21}\\ V_{21}=\begin{array}{}\end{array}\left[\begin{array}{cc}{\mathrm{\&mu;}}_1& {\mathrm{\&mu;}}_2\\ {\mathrm{\&mu;}}_3& {\mathrm{\&mu;}}_4\end{array}\right]\\ D_{21}=\left]\begin{array}{cc}{\mathrm{\&chi;}}_1& 0\\ 0& {\mathrm{\&chi;}}_2\end{array}\right]\end{array}\right.---\mathrm{3.3.4}$

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="23"\; label="T"\; filenames="H2009101745913E0000033.png"\; state="\{\{state\}\}">T</figure-callout>}}_{23}=\begin{array}{}\end{array}\left[\begin{array}{cc}{a}_1& c_2\\ {\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">c</figure-callout>}}_2^{*}& b_1\end{array}\right]\\ T_{24}=\left[\begin{array}{cc}{a}_2& d_2\\ {\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">d</figure-callout>}}_2^{*}& {\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">b</figure-callout>}}_2\end{array}\right]\end{array}\right.\&DoubleRightArrow;\left\{\begin{array}{c}{T}_{24}{V}_{22}=T_{23}{V}_{22}{D}_{22}\\ V_{22}=\begin{array}{}\end{array}\left[\begin{array}{cc}{\mathrm{\&kappa;}}_1& {\mathrm{\&kappa;}}_2\\ {\mathrm{\&kappa;}}_3& {\mathrm{\&kappa;}}_4\end{array}\right]\\ D_{22}=\left]\begin{array}{cc}{\mathrm{\&nu;}}_1& 0\\ 0& {\mathrm{\&nu;}}_2\end{array}\right]\end{array}\right.$

Can obtain needed W from following formula ₂:

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="H2009101745913E0000033.png,H2009101745913E0000034.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\mathrm{\&beta;}\left[\begin{array}{cccc}{\mathrm{\&mu;}}_1& 0& {\mathrm{\&mu;}}_2& 0\\ 0& {\mathrm{\&kappa;}}_1& 0& {\mathrm{\&kappa;}}_2\\ {\mathrm{\&mu;}}_3& 0& {\mathrm{\&mu;}}_4& 0\\ 0& {\mathrm{\&kappa;}}_3& 0& {\mathrm{\&kappa;}}_4\end{array}\right]---\mathrm{3.3.5}$

306: described first pre-coding matrix W1 that obtains and the described second pre-coding matrix W2 are carried out matrix multiple, obtain the pairing pre-coding matrix W of described channel matrix information, i.e. W=W1W2;

307: described matrix s and the described pre-coding matrix W of transmitting multiplied each other;

308: obtain transmitting after the precoding thereby obtain the precoding matrix W s that transmits.

It should be noted that this method can also comprise:

S1: transmitting terminal obtains the described matrix that transmits and is mapped to various mappings combination and corresponding channel capacity thereof on the transmitting antenna;

Wherein, the described matrix that transmits is mapped to the various combinations on the transmitting antenna:

Φ ₁＝[φ ₁ φ ₂ φ ₃ φ ₄] Φ ₂＝[φ ₁ φ ₃ φ2 φ ₄]

Φ ₃＝[φ ₁ φ ₃ φ ₄ φ ₂] Φ ₄＝[φ ₃ φ ₁ φ ₂ φ ₄] 3.3.6

Φ ₅＝[φ ₃ φ ₁ φ ₄ φ ₂] Φ ₆＝[φ ₃ φ ₄ φ ₁ φ ₂]

φ among the formula 3.3.6 ₁, φ ₂, φ ₃, φ ₄As follows:

φ ₁＝[1 0 0 0] ^T φ ₂＝[0 1 0 0] ^T

φ ₃＝[0 0 1 0] ^T φ ₄＝[0 0 0 1] ^T

The above φ _iBe used for indicating the s emission signal s of the described matrix that transmits _iBe mapped on the transmitting antenna i.

The pairing channel capacity of various combinations that the described matrix that transmits is mapped on the transmitting antenna is R:

$R=\underset{k=1}{\overset{4}{\mathrm{\&Sigma;}}}{\log }_2(1+\sin r\_k)$

Wherein, as k=1,2,3,4 the time; The acquisition process of sinr_k is:

$H_{\mathrm{\&omega;}}^{\left(1\right)}=H^{\left(1\right)}W$ $H_{\mathrm{\&omega;}}^{\left(2\right)}=H^{\left(2\right)}W$

${\left(H_{\mathrm{\&omega;}}^{\left(1\right)}\right)}^H{H}_{\mathrm{\&omega;}}^{\left(1\right)}=\left[\begin{array}{cccc}p\_11& 0& 0& 0\\ 0& p\_12& 0& 0\\ 0& 0& p\_13& 0\\ 0& 0& 0& p\_14\end{array}\right]$

${\left(H_{\mathrm{\&omega;}}^{\left(2\right)}\right)}^H{H}_{\mathrm{\&omega;}}^{\left(2\right)}=\left[\begin{array}{cccc}p\_21& 0& 0& 0\\ 0& p\_22& 0& 0\\ 0& 0& p\_23& 0\\ 0& 0& 0& p\_24\end{array}\right]$

$\begin{array}{cc}\sin r\_1=\frac{{|p\_11|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(1\right)}(:,1)\right|}^2{\mathrm{\&sigma;}}^2}& \sin r\_2=\frac{{|p\_12|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(1\right)}(:,2)\right|}^2{\mathrm{\&sigma;}}^2}\\ \sin r\_3=\frac{{|p\_23|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(2\right)}(:,3)\right|}^2{\mathrm{\&sigma;}}^2}& \sin r\_4=\frac{{|p\_24|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(2\right)}(:,4)\right|}^2{\mathrm{\&sigma;}}^2}\end{array}$

$\begin{array}{cc}\sin r\_1=\frac{{|p\_11|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(1\right)}(:,1)\right|}^2{\mathrm{\&sigma;}}^2}& \sin r\_2=\frac{{|p\_12|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(1\right)}(:,2)\right|}^2{\mathrm{\&sigma;}}^2}\\ \sin r\_3=\frac{{|p\_23|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(2\right)}(:,3)\right|}^2{\mathrm{\&sigma;}}^2}& \sin r\_4=\frac{{|p\_24|}^2}{{\left|H_{\mathrm{\&omega;}}^{\left(2\right)}(:,4)\right|}^2{\mathrm{\&sigma;}}^2}\end{array}$

With in the following formula (:, k) representing matrix (:, the k row in k).

S2: obtain the maximum in the described channel capacity, and determine that according to the maximum of channel capacity the described matrix that transmits is mapped to the mapping compound mode on the transmitting antenna.Wherein, the maximum in the described channel capacity can obtain by following formula:

$\arg \underset{{\mathrm{\&Phi;}}_{i}i,=1,...,6}{\max }\left(\underset{k=1}{\overset{4}{\mathrm{\&Sigma;}}}{\log }_2(1+\sin r\_k)\right)$

By top description as can be seen, can be at the method for precoding that transmitting terminal adopted by carrying out precoding processing to transmitting based on two space-time transmit diversity systems, the difference that makes receiving terminal receive receives son stream s ₁, s ₂, s ₃And s ₄Between interference be 0; Described transmitting terminal can also obtain various mapping combinations and the corresponding channel capacity thereof of matrix on each transmitting antenna that transmit in advance, thereby obtain the maximum in the described channel capacity, and determine that according to the maximum of channel capacity the described matrix that transmits is mapped to the mapping compound mode on the transmitting antenna, makes the performance of whole system reach optimization.

As shown in Figure 4, be a kind of pre-coding apparatus based on two space-time transmit diversity systems that the embodiment of the invention provides, this device comprises:

Matrix acquiring unit 401 is used to obtain transmit matrix and corresponding channel matrix thereof;

Diagonalization processing unit 402 is used for that described channel matrix is carried out diagonalization and handles, and obtains pre-coding matrix;

Precoding processing unit 403 is used for handling the accessed pre-coding matrix in back according to described channel matrix diagonalization, carries out precoding processing to transmitting.

It should be noted that precoding processing unit in the described device, specifically comprise:

The precoding processing subelement is used for described matrix and the described pre-coding matrix of transmitting multiplied each other;

Precoding transmits and obtains subelement, obtains transmitting after the precoding thereby be used to obtain the precoding matrix that transmits.

As shown in Figure 5, for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of single user, based on diagonalization processing unit 402 described in the pre-coding apparatus of two space-time transmit diversity systems, this unit comprises:

Submatrix obtains subelement 501, is used to obtain the submatrix of described channel matrix;

First pre-coding matrix obtains subelement 502, is used for the submatrix of described channel matrix back-diagonal is carried out the diagonalization processing, obtains first pre-coding matrix;

Channel matrix is handled subelement 503, is used for according to described first pre-coding matrix described channel matrix being carried out matrix operation;

Second pre-coding matrix obtains subelement 504, is used for obtaining second pre-coding matrix with carrying out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix;

Pre-coding matrix obtains subelement 505, is used for described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, obtains the pairing pre-coding matrix of described channel matrix.

As shown in Figure 6, for the embodiment of the invention provide a kind of when described pair of space-time transmit diversity systems during for the two space-time transmit diversity systems of multi-user, based on diagonalization processing unit described in the pre-coding apparatus of two space-time transmit diversity systems, this unit comprises:

Submatrix obtains subelement 601, is used for obtaining the submatrix of two each user institute respective channels matrixes of space-time transmit diversity systems of described multi-user;

First pre-coding matrix obtains subelement 602, is used for the submatrix on described each user institute respective channels matrix back-diagonal is carried out singular value decomposition, obtains first pre-coding matrix;

Channel matrix is handled subelement 603, is used for according to described first pre-coding matrix described channel matrix being carried out matrix operation;

Second pre-coding matrix obtains subelement 604, is used for obtaining second pre-coding matrix with carrying out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix;

Pre-coding matrix obtains subelement 605, is used for described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, obtains the pairing pre-coding matrix of described channel matrix information.

It should be noted that described pre-coding apparatus based on two space-time transmit diversity systems can also comprise when described pair of space-time transmit diversity systems during for the two space-time transmit diversity systems of multi-user:

The capacity acquiring unit is used to obtain the described matrix that transmits and is mapped to various mappings combinations and corresponding channel capacity thereof on the transmitting antenna;

The antenna selected cell is used for obtaining the maximum of described channel capacity, and determines that according to the maximum of channel capacity the described matrix that transmits is mapped to the mapping compound mode on the transmitting antenna.

A kind of method for precoding and device that the embodiment of the invention provides based on two space-time transmit diversity systems, by obtaining transmit matrix and corresponding channel matrix thereof, and described channel matrix is carried out diagonalization handle, make subscriber signal before the transmitting terminal emission, just can be according to the pairing channel matrix situation of the current matrix that transmits, to transmit and carry out precoding, the signal of eliminating described each interchannel disturbs, make the receiving terminal side joint receive after described the transmitting, need not to carry out again the signal interference processing of each interchannel, thereby improved the systematic function of two space-time transmit diversity systems greatly.Can adopt the mode of precoding further to promote acceptance and channel capacity this moment.

Through the above description of the embodiments, one of ordinary skill in the art will appreciate that: realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise step as above-mentioned method embodiment, described storage medium, as: ROM/RAM, magnetic disc, CD etc.

The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (10)

1. the method for precoding based on two space-time transmit diversity systems is characterized in that, comprising:

Obtain transmit matrix and corresponding channel matrix thereof;

Described channel matrix is carried out diagonalization handle, obtain pre-coding matrix;

Handle the accessed pre-coding matrix in back according to described channel matrix diagonalization, carry out precoding processing to transmitting.

2. the method for precoding based on two space-time transmit diversity systems according to claim 1, it is characterized in that, when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of single user, describedly described channel matrix is carried out diagonalization handle, obtain the step of pre-coding matrix, comprising:

Obtain the submatrix of described channel matrix;

The submatrix of back-diagonal in the described channel matrix is carried out the diagonalization processing, obtain first pre-coding matrix;

According to described first pre-coding matrix described channel matrix is carried out matrix operation;

To carry out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix, obtain second pre-coding matrix;

Described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, obtain pre-coding matrix.

3. the method for precoding based on two space-time transmit diversity systems according to claim 1, it is characterized in that, when described pair of space-time transmit diversity systems is the two space-time transmit diversity systems of multi-user, describedly described channel matrix is carried out diagonalization handle, obtain the step of pre-coding matrix, comprising:

Obtain the submatrix of each user institute respective channels matrix in the two space-time transmit diversity systems of described multi-user;

Submatrix on described each user institute respective channels matrix back-diagonal is carried out singular value decomposition, obtain first pre-coding matrix;

According to described first pre-coding matrix described channel matrix is carried out matrix operation;

To carry out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix, obtain second pre-coding matrix;

Described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, obtain pre-coding matrix.

4. the method for precoding based on two space-time transmit diversity systems according to claim 3 is characterized in that, this method also comprises:

Obtain the described matrix that transmits and be mapped to various mappings combination and corresponding channel capacity thereof on the transmitting antenna;

Obtain the maximum in the described channel capacity, and determine that according to the maximum of channel capacity the described matrix that transmits is mapped to the mapping compound mode on the transmitting antenna.

5. according to any described method for precoding in the claim 1 to 4 based on two space-time transmit diversity systems, it is characterized in that, the described pre-coding matrix that gets access to after handling according to described channel matrix diagonalization carries out the step of precoding processing to transmitting, and comprising:

Described matrix and the described pre-coding matrix of transmitting multiplied each other;

Thereby obtain the precoding matrix that transmits and obtain transmitting after the precoding.

6. the pre-coding apparatus based on two space-time transmit diversity systems is characterized in that, comprising:

The matrix acquiring unit is used to obtain transmit matrix and corresponding channel matrix thereof;

The diagonalization processing unit is used for that described channel matrix is carried out diagonalization and handles, and obtains pre-coding matrix;

The precoding processing unit is used for handling the accessed pre-coding matrix in back according to described channel matrix diagonalization, carries out precoding processing to transmitting.

7. the pre-coding apparatus based on two space-time transmit diversity systems according to claim 6 is characterized in that, when described pair of space-time transmit diversity systems was the two space-time transmit diversity systems of single user, described diagonalization processing unit comprised:

Submatrix obtains subelement, is used to obtain the submatrix of described channel matrix;

First pre-coding matrix obtains subelement, is used for the submatrix of described channel matrix back-diagonal is carried out the diagonalization processing, obtains first pre-coding matrix;

Channel matrix is handled subelement, is used for according to described first pre-coding matrix described channel matrix being carried out matrix operation;

Second pre-coding matrix obtains subelement, is used for obtaining second pre-coding matrix with carrying out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix;

Pre-coding matrix obtains subelement, is used for described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, pre-coding matrix.

8. the pre-coding apparatus based on two space-time transmit diversity systems according to claim 6 is characterized in that, when described pair of space-time transmit diversity systems was the two space-time transmit diversity systems of multi-user, described diagonalization processing unit comprised:

Submatrix obtains subelement, is used for obtaining the submatrix of two each user institute respective channels matrixes of space-time transmit diversity systems of described multi-user;

First pre-coding matrix obtains subelement, is used for the submatrix on described each user institute respective channels matrix back-diagonal is carried out singular value decomposition, obtains first pre-coding matrix;

Channel matrix is handled subelement, is used for according to described first pre-coding matrix described channel matrix being carried out matrix operation;

Second pre-coding matrix obtains subelement, is used for obtaining second pre-coding matrix with carrying out singular value decomposition through the channel matrix after the matrix operation of described first pre-coding matrix;

Pre-coding matrix obtains subelement, is used for described first pre-coding matrix that obtains and described second pre-coding matrix are carried out matrix multiple, pre-coding matrix.

9. the pre-coding apparatus based on two space-time transmit diversity systems according to claim 8 is characterized in that, this device also comprises:

The capacity acquiring unit is used to obtain the described matrix that transmits and is mapped to various mappings combinations and corresponding channel capacity thereof on the transmitting antenna;

The antenna selected cell is used for obtaining the maximum of described channel capacity, and determines that according to the maximum of channel capacity the described matrix that transmits is mapped to the mapping compound mode on the transmitting antenna.

10. according to any described pre-coding apparatus in the claim 6 to 9, it is characterized in that described precoding processing unit comprises based on two space-time transmit diversity systems:

The precoding processing subelement is used for described matrix and the described pre-coding matrix of transmitting multiplied each other;

Precoding transmits and obtains subelement, obtains transmitting after the precoding thereby be used to obtain the precoding matrix that transmits.

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