CN101414864B - Method and apparatus for multi-antenna layered pre-encoding - Google Patents

Abstract

The embodiment of the invention discloses a multiaerial layered precoding method and a device thereof, which relates to the mobile communication field and is used for reducing the complexity of realizing the layered precoding process, shortening processing delay or saving hardware resource. The multiaerial layered precoding method provided by the embodiment of the invention comprises the following steps: a codebook corresponding to the data flow is determined according to the codebook number and the number of layers of the data flow and the relevant data of the prestored codebook; and carrying out precoding is carried out on the data flow by combining the codebook. The invention is applied to the precoding process of layered data flows of a transmitting end in a MIMO system.

Description

The method of multi-antenna layered pre-encoding and device

Technical field

The present invention relates to moving communicating field, relate in particular to method and the device of multi-antenna layered pre-encoding in a kind of mimo system.

Background technology

In order to improve power system capacity, follow-on WiMAX mobile communication system will adopt MIMO (Multi Input Multi Output, multiple-input and multiple-output) technology, namely place a plurality of antennas at the base station end, also place a plurality of antennas at travelling carriage, form the MIMO communication link between base station and the travelling carriage.

At the transmitting terminal of mimo system, transmitting data stream forms P data subflow through Space Time Coding, and this P data subflow gone out by P antenna transmission.For the transmitting data stream that is divided into the v layer, the layered pre-encoding process that converts thereof into P data subflow is as follows:

1) a kind of is without CDD (Cyclic Delay Diversity, cyclic delay diversity) precoding:

$\left[\begin{array}{c}{y}^{\left(0\right)}\left(i\right)\\ M\\ y^{(P-1)}\left(i\right)\end{array}\right]=W\left(i\right)\left[\begin{array}{c}{x}^{\left(0\right)}\left(i\right)\\ M\\ x^{(\mathrm{\υ}-1)}\left(i\right)\end{array}\right]$ ---formula 1

Formula 1 expression is mapped to the data flow of v layer on P the port (P antenna) and sends.Wherein: x (i) is v layer transmitting data stream, and y (i) is P data subflow; W (i) is a P * v matrix.

2) a kind of is large CDD precoding:

$\left[\begin{array}{c}{y}^{\left(0\right)}\left(i\right)\\ M\\ y^{(P-1)}\left(i\right)\end{array}\right]=W\left(i\right)D\left(i\right)U\left[\begin{array}{c}{x}^{\left(0\right)}\left(i\right)\\ M\\ x^{(\mathrm{\υ}-1)}\left(i\right)\end{array}\right]$ ---formula 2

Formula 2 expressions are mapped to the data flow of v layer on the P port (P antenna) and send.Wherein: x (i) is v layer transmitting data stream, and y (i) is P data subflow; W (i) is a P * v matrix; D (i) and U are known matrix, and D (i) U is a v * v matrix.

Top dual mode all relates to the calculating of code book W (i) and chooses process.Take 4 antennas as example, code book W (i) calculates by following formula:

$W_n=I-{2u}_n{u}_n^H/u_n^H{u}_n$ ---formula 3

Wherein, n is codebook number and n ∈ [0,15]; I is 4 * 4 unit matrix; u _nBe 4 * 1 known matrixes, can from table 1, inquire about according to codebook number obtaining; u _n ^HBe u _nConjugate transpose.The W that calculates by formula 3 _nBe 4 * 4 matrixes, and code book W (i) is the matrix of a P * v (P gets 4 here), therefore for different number of plies v, the choosing referring to table 1 of its code book.

Table 1

Take codebook number as 3, number of plies v is 2 for example, at first finds the u of codebook number 3 correspondences ₃, calculate in the substitution formula 3, obtain 4 * 4 matrix W ₃, then the value according to v is 2, inquires about the code book that obtains this moment to be in table 1

Namely choose matrix W ₃In the 1st row and 4 * 2 matrixes of the 2nd row composition, then with each element in this 4 * 2 matrix divided by

Obtain that matrix is that codebook number is 3 this moment, v is 2 o'clock codebook matrix W (i).

Then code book W (i) is updated in formula 1 or the formula 2, thereby converts the transmitting data stream of v layer to P data subflow, and send by P antenna.

State in realization in the process of multi-antenna layered pre-encoding, the inventor finds that there are the following problems at least in the prior art:

The process very complex is chosen in the calculating of code book W (i), wherein needs at least once to table look-up, the conjugate transpose computing of a matrix, twice matrix multiple, matrix and constant are divided by (u _n ^Hu _nThe result be constant), matrix subtracts each other, a sequence of operations such as rank transformation, so that the process of multi-antenna layered pre-encoding is at DSP (Digital Signal Processing, Digital Signal Processing) quite expends instruction in the realization, cause processing delay; In realizing, FPGA (Field Programmable Gate Array, field programmable gate array) also expends very much hardware resource.

Summary of the invention

Embodiments of the invention provide a kind of method and device of multi-antenna layered pre-encoding, in order to reduce the complexity of layered pre-encoding process implementation, shorten processing delay or save hardware resource.

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

A kind of method of multi-antenna layered pre-encoding comprises:

Call code table set of matrices or the codebook set of pre-save;

Codebook number according to data flow finds code table matrix corresponding to described data flow in the code table set of matrices of described pre-save, according to the number of plies of described data flow and the corresponding relation of code book, from the described code table matrix that finds, select the column vector corresponding with the described number of plies and form new matrix, obtain code book with described new matrix divided by the arithmetic square root of the described number of plies; Perhaps, codebook number and the number of plies according to data flow finds code book corresponding to described data flow in the codebook set of described pre-save;

In conjunction with described code book described data flow is carried out precoding.

A kind of device of multi-antenna layered pre-encoding comprises:

Determining unit is used for determining the code book that described data flow is corresponding according to the codebook number of data flow and the code book related data of the number of plies and pre-save; Described determining unit comprises: the first memory module is used for storage code table set of matrices; First searches module, is used for searching code table matrix corresponding to described codebook number according to the codebook number of described data flow at the described code table set of matrices of storage; Select module, be used for according to the number of plies of described data flow and the corresponding relation of code book, from the described code table matrix that finds, select the column vector corresponding with the described number of plies and form new matrix; The division module is used for the arithmetic square root of described new matrix divided by the described number of plies obtained code book; Perhaps, described determining unit comprises: the second memory module is used for the storage codebook set; Second searches module, is used for searching code book corresponding to described data flow according to codebook number and the number of plies of data flow at the described codebook set of storage;

Coding unit is used in conjunction with described code book described data flow being carried out precoding.

The method of the multi-antenna layered pre-encoding that the embodiment of the invention provides and device, the code book related data is preserved, when carrying out layered pre-encoding, only need find the code book related data like this, needed code book in the time of then just getting access to the data flow precoding by simple operation; With respect to prior art, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides and device, when carrying out layered pre-encoding, avoided loaded down with trivial details code book computational process, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Description of drawings

The method flow diagram of the multi-antenna layered pre-encoding that Fig. 1 provides for the embodiment of the invention;

Fig. 2 is the method flow diagram of the embodiment of the invention one;

Fig. 3 is the method flow diagram of the embodiment of the invention two;

The device schematic diagram of the multi-antenna layered pre-encoding that Fig. 4 provides for the embodiment of the invention;

Fig. 5 is the device schematic diagram of the embodiment of the invention three;

Fig. 6 is the device schematic diagram of the embodiment of the invention four.

Embodiment

In order to reduce the complexity of layered pre-encoding process implementation in the mimo system, shorten processing delay or save hardware resource, embodiments of the invention provide a kind of method and device of multi-antenna layered pre-encoding.The below is take the mimo system of 4 antennas as example, and the multi-antenna layered pre-encoding method and the device that by reference to the accompanying drawings the embodiment of the invention are provided are described in detail.

As shown in Figure 1, the multi-antenna layered pre-encoding method that the embodiment of the invention provides may further comprise the steps:

11, determine the code book W (i) that described data flow is corresponding according to the self-contained codebook number n of data flow and the code book related data of number of plies v and pre-save.

Described code book related data can be the set of code table matrix, and described code table matrix is 4 * 4 matrixes;

Described code book related data also can be the set of code book, and described code book is 4 * v matrix, wherein v ∈ [Isosorbide-5-Nitrae].

12, in conjunction with described code book described data flow is carried out precoding.

The method of the multi-antenna layered pre-encoding that the embodiment of the invention provides is preserved the code book related data, only need find the code book related data when carrying out layered pre-encoding, needed code book in the time of then just getting access to the data flow precoding by simple operation; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Embodiment one:

Preserve data---the code table set of matrices relevant with the code book of data flow layered pre-encoding the transmitting terminal of mimo system is inner in advance, then when carrying out layered pre-encoding, only need search the code table matrix corresponding with data flow and need not again to calculate needed code table matrix in the precoding process.

As shown in Figure 2, the method for the multi-antenna layered pre-encoding that the embodiment of the invention provides may further comprise the steps:

21, the codebook number n according to data flow finds code table matrix corresponding to this data flow in the code table set of matrices of pre-save.

Wherein, the code table set of matrices of described pre-save is 4 * 4 matrix W that calculate by formula 3 _nSet; For 4 antenna mimo systems, the set of the data flow code table matrix that may occur is as follows:

$W_0=\frac{1}{2}\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& 1& (-1)& (-1)\\ 1& (-1)& 1& (-1)\\ 1& (-1)& (-1)& 1\end{array}\right]$ $W_4=\frac{1}{2}\left[\begin{array}{cccc}1& \sqrt{2}/2(1-j)& j& \sqrt{2}/2(-1-j)\\ \sqrt{2}/2(1+j)& 1& \sqrt{2}/2(-1+j)& j\\ j& \sqrt{2}/2(-1-j)& 1& \sqrt{2}/2(-1+j)\\ \sqrt{2}/2(-1+j)& j& \sqrt{2}/2(-1-j)& 1\end{array}\right]$ $W_8=\frac{1}{2}\left[\begin{array}{cccc}1& 1& (-1)& (-1)\\ 1& 1& 1& 1\\ (-1)& 1& 1& (-1)\\ (-1)& 1& (-1)& 1\end{array}\right]$ ${\mathrm{<figure-callout\; id="12"\; label="W"\; filenames="H2008101845438E00011.png"\; state="\{\{state\}\}">W</figure-callout>}}_{12}=\frac{1}{2}\left[\begin{array}{cccc}1& 1& 1& (-1)\\ 1& 1& (-1)& 1\\ 1& (-1)& 1& 1\\ (-1)& 1& 1& 1\end{array}\right]$

$W_1=\frac{1}{2}\left[\begin{array}{cccc}1& (-j)& (-1)& j\\ j& 1& j& 1\\ (-1)& (-j)& 1& j\\ (-j)& 1& (-j)& 1\end{array}\right]$ $W_5=\frac{1}{2}\left[\begin{array}{cccc}1& \sqrt{2}/2(-1-j)& j& \sqrt{2}/2(-1-j)\\ \sqrt{2}/2(-1+j)& 1& \sqrt{2}/2(-1+j)& -j\\ -j& \sqrt{2}/2(1-j)& 1& \sqrt{2}/2(1+j)\\ \sqrt{2}/2(1+j)& j& \sqrt{2}/2(1-j)& 1\end{array}\right]$ $W_9=\frac{1}{2}\left[\begin{array}{cccc}1& (-j)& 1& -j\\ j& 1& -j& (-1)\\ 1& j& 1& j\\ j& (-1)& (-j)& 1\end{array}\right]$ $W_{13}=\frac{1}{2}\left[\begin{array}{cccc}1& 1& (-1)& 1\\ 1& 1& 1& (-1)\\ (-1)& 1& 1& 1\\ 1& (-1)& 1& 1\end{array}\right]$

$W_2=\frac{1}{2}\left[\begin{array}{cccc}1& (-1)& 1& (-1)\\ (-1)& 1& 1& (-1)\\ 1& 1& 1& 1\\ (-1)& (-1)& 1& 1\end{array}\right]$ $W_6=\frac{1}{2}\left[\begin{array}{cccc}1& \sqrt{2}/2(-1+j)& -j& \sqrt{2}/2(1+j)\\ \sqrt{2}/2(-1-j)& 1& \sqrt{2}/2(1-j)& j\\ j& \sqrt{2}/2(1+j)& 1& \sqrt{2}/2(1-j)\\ \sqrt{2}/2(1-j)& -j& \sqrt{2}/2(1+j)& 1\end{array}\right]$ $W_{10}=\frac{1}{2}\left[\begin{array}{cccc}1& (-1)& (-1)& 1\\ (-1)& 1& (-1)& 1\\ (-1)& (-1)& 1& 1\\ 1& 1& 1& 1\end{array}\right]$ $W_{14}=\frac{1}{2}\left[\begin{array}{cccc}1& (-1)& 1& 1\\ (-1)& 1& 1& 1\\ 1& 1& 1& (-1)\\ 1& 1& (-1)& 1\end{array}\right]$

$W_3=\frac{1}{2}\left[\begin{array}{cccc}1& j& (-1)& j\\ j& 1& j& 1\\ (-1)& j& 1& j\\ j& 1& j& 1\end{array}\right]$ $W_7=\frac{1}{2}\left[\begin{array}{cccc}1& \sqrt{2}/2(1+j)& j& \sqrt{2}/2(-1+j)\\ \sqrt{2}/2(1-j)& 1& \sqrt{2}/2(-1-j)& -j\\ -j& \sqrt{2}/2(-1+j)& 1& \sqrt{2}/2(-1-j)\\ \sqrt{2}/2(-1-j)& j& \sqrt{2}/2(-1+j)& 1\end{array}\right]$ ${\mathrm{<figure-callout\; id="11"\; label="W"\; filenames="H2008101845438E00011.png"\; state="\{\{state\}\}">W</figure-callout>}}_{11}=\frac{1}{2}\left[\begin{array}{cccc}1& j& 1& j\\ (-j)& 1& j& (-1)\\ 1& (-j)& 1& (-j)\\ (-j)& (-1)& j& 1\end{array}\right]$ $W_{15}=\frac{1}{2}\left[\begin{array}{cccc}1& (-1)& (-1)& (-1)\\ (-1)& 1& (-1)& (-1)\\ (-1)& (-1)& 1& (-1)\\ (-1)& (-1)& (-1)& 1\end{array}\right]$

In above-mentioned code table set of matrices, have 16 4 * 4 matrixes, corresponding one of them 4 * 4 matrix W of each codebook number n (0≤n≤15) _n, be 7 data flow such as codebook number, its corresponding code table matrix is exactly the W in the above-mentioned code table set of matrices ₇

Directly being saved in DSP space as constant above-mentioned 16 matrixes or in the memory space of FPGA, can certainly be in the memory space that can conveniently read when being saved in other precoding.

22, according to the number of plies v of data flow and the corresponding relation of code book (seeing Table 1), from the code table matrix that finds, select the column vector corresponding with the described number of plies and form new matrix, obtain code book with described new matrix divided by the arithmetic square root of the described number of plies.

For example, the codebook number of data flow is 7, and the number of plies is 4, then can know by table 1, and code book corresponding to this data flow is

Namely choose the code table matrix W ₇In the 1st row, the 3rd row, the 2nd row and the 4th row, it is formed a new matrix, and with this new matrix divided by 2 obtain be code book corresponding to described data flow.

23, in conjunction with described code book described data flow is carried out precoding.

The code book that obtains is updated in formula 1 or the formula 2 data flow that is mapped to 4 antennas after can obtaining encoding by computing.

In addition, convenient for computing, the code table matrix that calculates in the step 21 all can be multiply by 2, and with it as new code table matrix, in follow-up precoding process, all carry out computing with this new code table matrix; Like this, when carrying out step 23, need to all multiply by 1/2 in conjunction with code book to the data that data stream carries out obtaining after the precoding with described, be only the data flow that finally is mapped to 4 antennas.

The method of the multi-antenna layered pre-encoding that the embodiment of the invention provides, the code table matrix relevant with data flow preserved, when carrying out layered pre-encoding, only need find code table matrix corresponding to data flow codebook number, needed code book in the time of then just getting access to the data flow precoding by simple operation; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Embodiment two:

Preserve data---the codebook set relevant with the code book of data flow layered pre-encoding the transmitting terminal of mimo system is inner in advance, then when carrying out layered pre-encoding, only need search the code book corresponding with data flow and need not again to calculate needed code book in the precoding process.

As shown in Figure 3, the method for the multi-antenna layered pre-encoding that the embodiment of the invention provides may further comprise the steps:

31, codebook number n and the number of plies v according to data flow finds code book corresponding to described data flow in the codebook set of pre-save.

Wherein, the codebook set of described pre-save obtains by following process:

I) calculate the data flow code table matrix W that might occur by formula 3 _n(0≤n≤15) obtain 16 4 * 4 matrixes altogether (with 16 code table matrix W among the embodiment one _nIdentical, no longer describe in detail) herein;

Ii) according to the number of plies v of data flow and the corresponding relation of code book (seeing Table 1), from described code table matrix W _nIn select the column vector corresponding with the described number of plies and form new matrix, obtain code book divided by the arithmetic square root of the described number of plies and preserve with described new matrix.For example, the codebook number of data flow is 7, and the number of plies is 4, then can know by table 1, and code book corresponding to this data flow is

Namely choose the code table matrix W ₇In the 1st row, the 3rd row, the 2nd row and the 4th row, it is formed a new matrix, and with this new matrix divided by 2 obtain be code book corresponding to described data flow.

Directly being saved in DSP space as constant above-mentioned code book or in the memory space of FPGA, can certainly be in the memory space that can conveniently read when being saved in other precoding.

At this moment, have 16 * 4 matrixes in the codebook set of pre-save, corresponding to different data flow number of plies v, the size of its code book is respectively 4 * v (1≤v≤4).As long as known codebook number n and the number of plies v of data flow, just can in the codebook set of pre-save, find code book corresponding to described data flow.

32, in conjunction with the code book that finds described data flow is carried out precoding.

The code book that finds is updated in formula 1 or the formula 2 data flow that is mapped to 4 antennas after can obtaining encoding by computing.

In addition, convenient for computing, the code table matrix that calculates in the step 21 all can be multiply by 2, and with it as new code table matrix, in follow-up precoding process, all carry out computing with this new code table matrix; Like this, when carrying out step 23, need to all multiply by 1/2 in conjunction with code book to the data that data stream carries out obtaining after the precoding with described, be only the data flow that finally is mapped to 4 antennas.

The method of the multi-antenna layered pre-encoding that the embodiment of the invention provides, the code book relevant with data flow preserved, when carrying out layered pre-encoding, only needed once to search needed code book just can obtain described data flow and carry out layered pre-encoding the time according to data flow codebook number and the number of plies; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Corresponding to the method for above-mentioned multi-antenna layered pre-encoding, the embodiment of the invention also provides a kind of device of multi-antenna layered pre-encoding, as shown in Figure 4, comprises determining unit 41 and coding unit 42; Wherein,

Determining unit 41 is determined the code book that described data flow is corresponding according to the codebook number of data flow and the code book related data of the number of plies and pre-save, and then coding unit 42 carries out precoding in conjunction with described code book to described data flow.

The device of the multi-antenna layered pre-encoding that the embodiment of the invention provides is preserved the code book related data, only need find the code book related data when carrying out layered pre-encoding, needed code book in the time of then just getting access to the data flow precoding by simple operation; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Embodiment three:

If be the code table set of matrices in the inner code book related data of preserving of the transmitting terminal of mimo system in advance, then the device of the multi-antenna layered pre-encoding that provides of the embodiment of the invention as shown in Figure 5, comprises determining unit 51, coding unit 52 and computing unit 53; Wherein,

Determining unit 51 is determined the code book that described data flow is corresponding according to the codebook number n of data flow and the code table set of matrices of number of plies v and pre-save, and then coding unit 52 carries out precoding in conjunction with described code book to described data flow.

Further, determining unit 51 comprises: memory module 511, search module 512, select module 513 and division module 514;

Wherein, store the code table set of matrices in the memory module 511, search module 512 and in the code table set of matrices that memory module 511 is stored, search code table matrix W corresponding to this codebook number according to the codebook number n of data flow _n, select afterwards module 513 according to the number of plies v of data flow and the corresponding relation of code book, from the code table matrix W that finds _nIn select the column vector corresponding with the described number of plies and form new matrix, and by division module 514 with the arithmetic square root of described new matrix divided by number of plies v, obtain code book.

The code table matrix of storage is all calculated according to formula 3 by computing unit 53 in memory module 511.

In addition, convenient for computing, the device of the multi-antenna layered pre-encoding that the embodiment of the invention provides also comprises: the first multiplication unit 54 and the second multiplication unit 55;

The first multiplication unit 54 all multiply by 2 with the code table matrix that computing unit 53 calculates, and with it as new code table matrix; The second multiplication unit 55 all multiply by 1/2 in conjunction with code book to the data that data stream carries out obtaining after the precoding with described coding unit 52.

The device of the multi-antenna layered pre-encoding that the embodiment of the invention provides, the code table matrix relevant with data flow preserved, when carrying out layered pre-encoding, only need find code table matrix corresponding to data flow codebook number, needed code book in the time of then just getting access to the data flow precoding by simple operation; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

Embodiment four:

If be codebook set in the inner code book related data of preserving of the transmitting terminal of mimo system in advance, the device of the multi-antenna layered pre-encoding that provides of the embodiment of the invention then, as shown in Figure 6, comprise determining unit 61, coding unit 62 and computing unit 63, selected cell 64, divider 65; Wherein,

Determining unit 61 is determined the code book that described data flow is corresponding according to the codebook number n of data flow and the codebook set of number of plies v and pre-save, and then coding unit 62 carries out precoding in conjunction with described code book to described data flow.

Further, determining unit 61 comprises: memory module 611 and search module 612;

Wherein, store codebook set in the memory module 611, search 612 codebook number n and number of plies v according to data flow of module and in the codebook set that memory module 611 is stored, search code book corresponding to described data flow.

The code book of storage obtains by computing unit 63, selected cell 64 and divider 65 in memory module 611; Wherein, computing unit 63 calculates 4 * 4 code table matrix W according to formula 3 _n, then selected cell 64 according to the corresponding relation of the number of plies v of data flow and code book from described code table matrix W _nIn select the column vector corresponding with number of plies v and form new matrix, divider 65 obtains code book with described new matrix divided by the arithmetic square root of number of plies v afterwards, and sends described code book to memory module 611.

In addition, convenient for computing, the device of the multi-antenna layered pre-encoding that the embodiment of the invention provides also comprises: the first multiplication unit 66 and the second multiplication unit 67;

The first multiplication unit 66 all multiply by 2 with the code table matrix that computing unit 63 calculates, and with it as new code table matrix; The second multiplication unit 67 all multiply by 1/2 in conjunction with code book to the data that data stream carries out obtaining after the precoding with described coding unit 62.

The device of the multi-antenna layered pre-encoding that the embodiment of the invention provides, the code book relevant with data flow preserved, when carrying out layered pre-encoding, only needed once to search needed code book just can obtain described data flow and carry out layered pre-encoding the time according to data flow codebook number and the number of plies; Like this, the method of the multi-antenna layered pre-encoding that the embodiment of the invention provides has been avoided loaded down with trivial details code book computational process when carrying out layered pre-encoding, reduce the complexity that layered pre-encoding is realized, and can shorten processing delay and saving the hardware resource in FPGA realize of cataloged procedure in DSP realizes.

In the embodiment of the method for multi-antenna layered pre-encoding provided by the invention and device, all be that situation take 4 antennas is as example.Development along with the MIMO technology; the situation that 8 antennas even more antennas also can occur later; its method and apparatus that carries out layered pre-encoding is all identical with the method and apparatus that the embodiment of the invention provides; only the size of the code book related data of pre-save changes to some extent, so all should be included within protection scope of the present invention.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

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

Claims (8)

1. the method for a multi-antenna layered pre-encoding is characterized in that, comprising:

Call code table set of matrices or the codebook set of pre-save;

Codebook number according to data flow finds code table matrix corresponding to described data flow in the code table set of matrices of described pre-save, according to the number of plies of described data flow and the corresponding relation of code book, from the described code table matrix that finds, select the column vector corresponding with the described number of plies and form new matrix, obtain code book with described new matrix divided by the arithmetic square root of the described number of plies; Perhaps, codebook number and the number of plies according to data flow finds code book corresponding to described data flow in the codebook set of described pre-save;

In conjunction with described code book described data flow is carried out precoding.

2. the method for multi-antenna layered pre-encoding according to claim 1 is characterized in that, the code table set of matrices of described pre-save obtains by following process:

Pass through formula

Calculate described code table matrix, and described code table matrix is preserved;

Wherein, n is described codebook number, and I is unit matrix, u _nBe known column matrix.

3. the method for multi-antenna layered pre-encoding according to claim 1 is characterized in that, the codebook set of described pre-save obtains by following process:

Pass through formula

Calculate the code table matrix; Wherein, n is described codebook number, and I is unit matrix, u _nBe known column matrix;

According to the number of plies of described data flow and the corresponding relation of code book, from described code table matrix, select the column vector corresponding with the described number of plies and form new matrix, obtain code book with described new matrix divided by the arithmetic square root of the described number of plies, and described code book is preserved.

4. according to claim 2 or the method for 3 described multi-antenna layered pre-encodings, it is characterized in that, also comprise:

The described code table matrix that calculates all be multiply by 2 as new code table matrix;

Described data of described data flow being carried out obtaining after the precoding in conjunction with code book all be multiply by 1/2.

5. the device of a multi-antenna layered pre-encoding is characterized in that, comprising:

Determining unit is used for determining the code book that described data flow is corresponding according to the codebook number of data flow and the code book related data of the number of plies and pre-save; Described determining unit comprises: the first memory module is used for storage code table set of matrices; First searches module, is used for searching code table matrix corresponding to described codebook number according to the codebook number of described data flow at the described code table set of matrices of storage; Select module, be used for according to the number of plies of described data flow and the corresponding relation of code book, from the described code table matrix that finds, select the column vector corresponding with the described number of plies and form new matrix; The division module is used for the arithmetic square root of described new matrix divided by the described number of plies obtained code book; Perhaps, described determining unit comprises: the second memory module is used for the storage codebook set; Second searches module, is used for searching code book corresponding to described data flow according to codebook number and the described number of plies of described data flow at the described codebook set of storage;

Coding unit is used in conjunction with described code book described data flow being carried out precoding.

6. the device of multi-antenna layered pre-encoding according to claim 5 is characterized in that, when described determining unit comprised described the first memory module, this device also comprised:

Computing unit is used for according to formula Calculate described code table matrix, and described code table matrix is sent to described the first memory module; Wherein, n is described codebook number, and I is unit matrix, u _nBe known column matrix.

7. the device of multi-antenna layered pre-encoding according to claim 5 is characterized in that, when described determining unit comprised described the second memory module, this device also comprised:

Computing unit is used for according to formula

Calculate the code table matrix; Wherein, n is described codebook number, and I is unit matrix, u _nBe known column matrix;

Selected cell is used for according to the number of plies of described data flow and the corresponding relation of code book, selects the column vector corresponding with the described number of plies and form new matrix from described code table matrix;

Divider is used for described new matrix is obtained code book divided by the arithmetic square root of the described number of plies, and sends described code book to described the second memory module.

8. according to claim 6 or the device of 7 described multi-antenna layered pre-encodings, it is characterized in that, this device also comprises:

The first multiplication unit, the described code table matrix that is used for computing unit is obtained all multiply by 2 as new code table matrix;

The second multiplication unit is used for described data of described data flow being carried out obtaining after the precoding in conjunction with code book all be multiply by 1/2.

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