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 PDFInfo
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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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 code book
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 239000011159 matrix materials Substances 0.000 claims abstract description 108
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Abstract
Description
Technical field
The present invention relates to a kind of multipleinput and multipleoutput (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
Multipleinput and multipleoutput (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 precoding 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 subchannel, 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 noncodebook 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 precoding 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 multiinput multioutput 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 precoding matrix V of said transmitting terminal according to channel matrix;
B, said receiving terminal find the immediate codebook matrix with said precoding 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 precoding 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 precoding matrix V the code book of said receiving terminal on being configured in said receiving terminal, specifically comprise:
B1, basis Obtain θ _{k}And φ _{k}
B2, find out and said θ respectively _{k}And φ _{k}The angle value θ ' of immediate quantification _{k}And φ ' _{k}, find the code book on being configured in said receiving terminal and said θ ' _{k}And φ ' _{k}Corresponding codebook matrix.
Further, the construction method of abovementioned code book comprises:
With θ _{k}Be divided into the angle value of the quantification of i grade, with φ _{k}Be 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 _{k}With the pi/2 is that magnitude is divided, said φ _{k}The phase place starting point is any; Said θ _{k}Value 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 _{k}Value 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 multiinput multioutput system of two transmitting antennas:
With θ _{k}And φ _{k}Be 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 _{k}With the pi/2 is that magnitude is divided, said φ _{k}The phase place starting point is any; Said θ _{k}Value 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 _{k}Value 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 precoding scheme of codebook mode in the prior art;
Fig. 2 is based on the reception antenna FB(flow block) of the precoding 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 noncodebook 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:
Wherein, φ _{k}Be 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 _{k}For 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 _{k}So the structure code book is θ _{k}Can 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 _{k}And φ _{k}After 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 precoding matrix V of transmitting terminal and the precoding 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 _{k}And φ _{k}
(2) θ that finds out and try to achieve _{k}And φ _{k}The 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 precoding 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 computerreadable recording medium, like readonly 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.
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CN1756119A (en) *  20040928  20060405  上海贝尔阿尔卡特股份有限公司  Precoding method and device for improving VBLAST detection performance 
CN1973473A (en) *  20040623  20070530  英特尔公司  Closed loop MIMO systems using codebooks for feedback 

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CN1973473A (en) *  20040623  20070530  英特尔公司  Closed loop MIMO systems using codebooks for feedback 
CN1756119A (en) *  20040928  20060405  上海贝尔阿尔卡特股份有限公司  Precoding method and device for improving VBLAST detection performance 
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