CN101867463B - Precoding method based on codebook mode and construction method of codebook - Google Patents

Precoding method based on codebook mode and construction method of codebook Download PDF

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CN101867463B
CN101867463B CN 201010207684 CN201010207684A CN101867463B CN 101867463 B CN101867463 B CN 101867463B CN 201010207684 CN201010207684 CN 201010207684 CN 201010207684 A CN201010207684 A CN 201010207684A CN 101867463 B CN101867463 B CN 101867463B
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matrix
codebook
code book
amp
φ
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CN 201010207684
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CN101867463A (en
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郭阳
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中兴通讯股份有限公司
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Abstract

The invention discloses a precoding method based on a codebook mode and a construction method of a codebook, which are applied in a multi-input multi-output system of two transmitting antennas. The precoding method comprises the following steps: constructing a codebook of a V matrix, wherein the rank is 1, the codebook at least comprises the following codebook matrix shown in the attached drawing, when the rank is 2, the codebook at least comprises the following matrix shown in the attached drawing, i.e. after configurating the codebook at a transmitting terminal and a receiving terminal, executing the following steps that: the receiving terminal obtains a precoding matrix of the transmitting terminal according to a channel matrix; the receiving terminal finds a codebook matrix proximal with the precoding matrix from the codebook configurated on the receiving terminal, and transmits the sequence number of the codebook matrix to the transmitting terminal; the transmitting terminal obtains a corresponding codebook matrix from the codebook configurated on the transmitting terminal according to the received sequence number of the codebook matrix, and carrying out the precoding on data stream by taking the corresponding codebook matrix as the precoding matrix. The invention can enable the system of the two transmitting antenna systems to obtain better performance with lower cost.

Description

A kind of method for precoding and code book construction method based on codebook mode

Technical field

The present invention relates to a kind of multiple-input and multiple-output (MIMO) mobile radio system, relate in particular to a kind of method for precoding and code book construction method based on codebook mode.

Background technology

Multiple-input and multiple-output (Multiple Input and Multiple Output; MIMO) system becomes in LTE (Long Term Evolution, the third generation mobile long evolving system) research the extremely technology paid close attention to of people owing to effectively improving channel capacity.Use precoding technique to carry out multiplexing between multiple data stream and the antenna and can more effectively utilize the existing channel resource, can improve power system capacity through power division, and can reduce the interference between the data flow, improve the overall performance of system data flow.Therefore precoding technique also becomes new research focus.

To introduce the basic theories method and the implementation of precoding in this part; The basic thought of this method is that receiving terminal obtains channel matrix through channel estimating, and this channel matrix is carried out obtaining transmitting terminal and employed pre-coding matrix V of receiving terminal and U after the singular value decomposition (SVD).Use i column vector of V matrix to send data flow as its weights when transmitting antenna; And i the column vector that reception antenna uses the U matrix (i=1 during as its weights; 2 ... S) during receiving data stream, this data flow just and only in i spatial sub-channel, transmit.Transmitting terminal can access the situation of the concrete element value of V matrix, is called desirable method for precoding, promptly based on the method for precoding of non-codebook mode.Based on drawing of codebook mode is owing to need the plain value of V entry of a matrix be fed back to transmitting terminal; But feedback space is not enough to transmit the information of all elements in the V matrix; So need simplify feedback information through making up code book, the code book through feedback and V approximate matrix carries out precoding.

In the prior art, realize for system based on the pre-coding scheme of codebook mode, as depicted in figs. 1 and 2.Receiving terminal searches out an immediate code book through the SVD decomposition computation in precoding weights code book, the sequence number of this code book is fed back to transmitting terminal; After the information via that transmitting terminal produces information source is encoded, is interweaved, modulates; Code book sequence number in conjunction with receiving reconstructs code book, information is carried out weighting after, through OFDMA (Orthogonal Frequency Division Multiple Access; OFDM) after the modulation, sends to receiving terminal; After receiving terminal is received, it is carried out restoring this information after OFDMA demodulation, detection, demodulation, deinterleaving, the channel decoding.

Summary of the invention

The invention provides a kind of method for precoding and code book construction method, with the precoding problem of the system that solves two transmitting antennas based on codebook mode.

For addressing the above problem; The invention provides a kind of method for precoding based on codebook mode; Be applied in the multi-input multi-output system of two transmitting antennas; Construct the code book of V matrix; Wherein, When order is 1; At least comprise following codebook matrix in the said code book: and when order is 2, comprise following codebook matrix in the said code book at least: and with this codebook configuration behind transmitting terminal and receiving terminal, execution as follows:

A, said receiving terminal obtain the pre-coding matrix V of said transmitting terminal according to channel matrix;

B, said receiving terminal find the immediate codebook matrix with said pre-coding matrix V, and the sequence number of this codebook matrix are sent to said transmitting terminal from configuration code book above that;

The sequence number of the said codebook matrix that c, said transmitting terminal basis receive obtains corresponding codebook matrix the code book on being configured in said transmitting terminal, as pre-coding matrix data stream is carried out precoding with the codebook matrix of said correspondence then.

Further, said method also can have following characteristic:

Among the step b, find the step with the immediate codebook matrix of said pre-coding matrix V the code book of said receiving terminal on being configured in said receiving terminal, specifically comprise:

B1, basis Obtain θ kAnd φ k

B2, find out and said θ respectively kAnd φ kThe angle value θ ' of immediate quantification kAnd φ ' k, find the code book on being configured in said receiving terminal and said θ ' kAnd φ ' kCorresponding codebook matrix.

Further, the construction method of above-mentioned code book comprises:

With θ kBe divided into the angle value of the quantification of i grade, with φ kBe divided into the angle value of the quantification of j grade;

Matrix is obtained in angle value difference substitution after quantizing; And with behind the evolution of this matrix divided by number of data streams N to be sent; Take out the preceding N row of this matrix, obtain code book.

Further, said method also can have following characteristic:

Said φ kWith the pi/2 is that magnitude is divided, said φ kThe phase place starting point is any; Said θ kValue after the quantification is: { π/4 π/4+ pi/2 π/4+ π π/4+3 pi/2 }.

Further, said method also can have following characteristic:

Said φ kValue be: { 0 pi/2 π, 3 pi/2s }.

Further, said method also can have following characteristic:

When N=2, the number of codebook matrix is 16 in the code book; When N=1, the number of codebook matrix is 8 in the code book.

The present invention also provides a kind of construction method of code book, is applied to may further comprise the steps in the multi-input multi-output system of two transmitting antennas:

With θ kAnd φ kBe divided into the angle value of the quantification of i, a j grade respectively;

Matrix is obtained in angle value difference substitution after quantizing; And with behind the evolution of this matrix divided by number of data streams N to be sent; Take out the preceding N row of this matrix, obtain code book; Wherein, When order is 1, comprise at least in the said code book that codebook matrix and comprise codebook matrix and at least in the said code book when order is 2

Further, said method also can have following characteristic:

Said φ kWith the pi/2 is that magnitude is divided, said φ kThe phase place starting point is any; Said θ kValue after the quantification is: { π/4 π/4+ pi/2 π/4+ π π/4+3 pi/2 }.

Further, said method also can have following characteristic:

Said φ kValue be: { 0 pi/2 π, 3 pi/2s }.

Further, said method also can have following characteristic:

When N=2, the number of codebook matrix is 16 in the code book; When N=1, the number of codebook matrix is 8 in the code book.

Adopt the present invention, can under the little situation of expense, make two system of transmit antennas obtain preferable performance.And this programme is not only applicable to the OFDMA system, equally is applicable to the system of other scheme yet.

Description of drawings

Fig. 1 is based on the transmitting antenna FB(flow block) of the pre-coding scheme of codebook mode in the prior art;

Fig. 2 is based on the reception antenna FB(flow block) of the pre-coding scheme of codebook mode in the prior art;

Fig. 3 is the flow chart of method for precoding in the embodiment of the invention.

Embodiment

Precoding based on codebook mode is on the basis of using non-codebook type precoding, selects immediate code book to carry out correspondence for the V matrix.

The method that code book makes up is as follows.

For the situation of two transmitting antennas, because the V matrix is a unitary matrice, 2 * 2 V matrix has self characteristics, according to its character can be with the V expression matrix:

V = cos ( θ k ) - sin ( θ k ) sin ( θ k ) exp ( jφ k ) cos ( θ k ) exp ( jφ k )

Wherein, φ kBe used to characterize the phase value of V matrix, its phase place starting point is any.Can be that magnitude is divided it with the pi/2, need the feedback space resource of 2 bits.4 phase places of recommending are: { 0 pi/2 π, 3 pi/2s };

θ kFor being used to characterize the angle that range value quantizes.In order further to reduce feedback overhead, so amplitude is not quantized, the amplitude of all elements is all equated, only utilize the phase of each element kSo the structure code book is θ kCan only get following 4 values:

{π/4?π/4+π/2?π/4+π?π/4+3π/2}。

The construction method of code book proposed by the invention may further comprise the steps:

To θ kAnd φ kAfter quantizing, the angle value of each quantification is brought into In, obtain the corresponding matrix of each quantized value.According to the number N (for two system of transmit antennas, N=1 or 2) of data flow to be sent, when N=1; First row that take out each matrix in these 16 matrixes are as code book, but because in these 16 matrixes, for first row of each matrix; All exist other a matrix to equate with its first row, therefore, for Rank1 situation (being the situation of N=1); The number of the codebook matrix in this code book is 8, and is as shown in table 1; When N=2, with the evolution of 16 matrixes, obtain 16 codebook matrix of V matrix under the Rank2 situation divided by N, as shown in table 2, and it is configured to transmitting terminal and receiving terminal respectively.

The code book of V matrix under the table 1 Rank1 mode

The code book of V matrix under the table 2 Rank2 mode

Wherein, the order that the Rank1 mode refers to channel matrix is 1, only have 1 layer to use, and transmitting antenna only sends a data flow; And the Rank2 mode refers to the order of channel matrix is 2, has 2 layers to use, and transmitting antenna can send 2 data flow simultaneously.The effect of the coefficient before the codebook matrix (mode is to Rank2 to the Rank1 mode for ) is to make transmitting power normalization, can not increase transmitting power because of using the code book weighting.

Code book adopts this code book to carry out the method for precoding after making up and accomplishing, and may further comprise the steps:

The first step: receiving terminal obtains channel matrix H according to channel estimating, and it is carried out obtaining the pre-coding matrix V of transmitting terminal and the pre-coding matrix U of receiving terminal after SVD decomposes;

Second step: from configuration code book above that, find and the immediate codebook matrix of V matrix, and feed back to transmitting terminal to the sequence number of this codebook matrix; The step of searching immediate codebook matrix specifically comprises:

(1) according to formula The V matrix is decomposed, obtain θ wherein kAnd φ k

(2) θ that finds out and try to achieve kAnd φ kThe angle value of immediate quantification obtains and the corresponding codebook matrix of the angle value of this quantification, and this codebook matrix is the codebook matrix the most approaching with the V matrix;

The 3rd step: transmitting terminal obtains corresponding pre-coding matrix according to the sequence number that receives from configuration code book above that, uses this matrix according to prior art data stream to be carried out precoding.

One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Claims (9)

1. the method for precoding based on codebook mode is applied to construct the code book of V matrix in the multi-input multi-output system of two transmitting antennas, wherein, when order is 1, comprises following codebook matrix in the said code book at least: 2 2 1 1 , 2 2 1 - 1 , 2 2 1 j And 2 2 1 - j ; , order comprises following codebook matrix when being 2 in the said code book at least: 1 2 1 1 1 - 1 And 1 2 1 1 i - i ; This codebook configuration behind transmitting terminal and receiving terminal, is carried out as follows:
A, said receiving terminal obtain the pre-coding matrix V of said transmitting terminal according to channel matrix;
B, said receiving terminal find the immediate codebook matrix with said pre-coding matrix V, and the sequence number of this codebook matrix are sent to said transmitting terminal from configuration code book above that;
The sequence number of the said codebook matrix that c, said transmitting terminal basis receive obtains corresponding codebook matrix the code book on being configured in said transmitting terminal, as pre-coding matrix data stream is carried out precoding with the codebook matrix of said correspondence then;
Wherein, the structure of said code book comprises:
With θ kBe divided into the angle value of the quantification of i grade, with φ kBe divided into the angle value of the quantification of j grade; φ kBe used to characterize the phase value of V matrix, its phase place starting point is any, θ kFor being used to characterize the angle that range value quantizes;
With the angle value substitution respectively after quantizing V = Cos ( θ k ) - Sin ( θ k ) Sin ( θ k ) Exp ( Jφ k ) Cos ( θ k ) Exp ( Jφ k ) Obtain matrix, and, take out the preceding N row of this matrix, obtain code book behind the evolution of this matrix divided by number of data streams N to be sent.
2. the method for claim 1 is characterized in that, among the step b, finds the step with the immediate codebook matrix of said pre-coding matrix V the code book of said receiving terminal on being configured in said receiving terminal, specifically comprises:
B1, basis V = Cos ( θ k ) - Sin ( θ k ) Sin ( θ k ) Exp ( Jφ k ) Cos ( θ k ) Exp ( Jφ k ) Obtain θ kAnd φ k
B2, find out and said θ respectively kAnd φ kThe angle value θ ' of immediate quantification kAnd φ ' k, find the code book on being configured in said receiving terminal and said θ ' kAnd φ ' kCorresponding codebook matrix.
3. the method for claim 1 is characterized in that, said φ kWith the pi/2 is that magnitude is divided, said φ kThe phase place starting point is any; Said θ kValue after the quantification is: { π/4 π/4+ pi/2 π/4+ π π/4+3 pi/2 }.
4. method as claimed in claim 3 is characterized in that, said φ kValue be: { 0 pi/2 π, 3 pi/2s }.
5. the method for claim 1 is characterized in that, when N=2, the number of codebook matrix is 16 in the code book; When N=1, the number of codebook matrix is 8 in the code book.
6. the construction method of a code book is applied to it is characterized in that in the multi-input multi-output system of two transmitting antennas, may further comprise the steps:
With θ kAnd φ kBe divided into the angle value of the quantification of i, a j grade respectively; Wherein, φ kBe used to characterize the phase value of V matrix, its phase place starting point is any, θ kFor being used to characterize the angle that range value quantizes;
With the angle value substitution respectively after quantizing V = Cos ( θ k ) - Sin ( θ k ) Sin ( θ k ) Exp ( Jφ k ) Cos ( θ k ) Exp ( Jφ k ) Obtain matrix, and, take out the preceding N row of this matrix, obtain code book behind the evolution of this matrix divided by number of data streams N to be sent; Wherein, when order is 1, comprise codebook matrix in the said code book at least 2 2 1 1 , 2 2 1 - 1 , 2 2 1 j And 2 2 1 - j , , order comprises codebook matrix when being 2 in the said code book at least 1 2 1 1 1 - 1 And 1 2 1 1 i - i .
7. method as claimed in claim 6 is characterized in that, said φ kWith the pi/2 is that magnitude is divided, said φ kThe phase place starting point is any; Said θ kValue after the quantification is: { π/4 π/4+ pi/2 π/4+ π π/4+3 pi/2 }.
8. method as claimed in claim 6 is characterized in that, said φ kValue be: { 0 pi/2 π, 3 pi/2s }.
9. method as claimed in claim 7 is characterized in that, when N=2, the number of codebook matrix is 16 in the code book; When N=1, the number of codebook matrix is 8 in the code book.
CN 201010207684 2007-09-18 2007-09-18 Precoding method based on codebook mode and construction method of codebook CN101867463B (en)

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Publication number Priority date Publication date Assignee Title
CN1756119A (en) * 2004-09-28 2006-04-05 上海贝尔阿尔卡特股份有限公司 Pre-coding method and device for improving V-BLAST detection performance
CN1973473A (en) * 2004-06-23 2007-05-30 英特尔公司 Closed loop MIMO systems using codebooks for feedback

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1973473A (en) * 2004-06-23 2007-05-30 英特尔公司 Closed loop MIMO systems using codebooks for feedback
CN1756119A (en) * 2004-09-28 2006-04-05 上海贝尔阿尔卡特股份有限公司 Pre-coding method and device for improving V-BLAST detection performance

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