CN102611534A - Method and system for transforming and updating codebook - Google Patents

Method and system for transforming and updating codebook Download PDF

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CN102611534A
CN102611534A CN2011100240232A CN201110024023A CN102611534A CN 102611534 A CN102611534 A CN 102611534A CN 2011100240232 A CN2011100240232 A CN 2011100240232A CN 201110024023 A CN201110024023 A CN 201110024023A CN 102611534 A CN102611534 A CN 102611534A
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code word
code book
transmitting terminal
receiving terminal
code
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CN102611534B (en
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张晨晨
张雷明
宋令阳
孙云锋
郭森宝
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses a method for transforming and updating a codebook and a system for transforming and updating the codebook. The method comprises the following steps of: precoding and transmitting a signal by a transmitting end, and receiving the signal by a receiving end; carrying out relevancy estimate of the space of an information channel at the transmitting end and the receiving end, and precoding the signal which is transmitted at a next time by the transmitting end according to an optimal code word which is feed back by the receiving end, wherein the optimal code word is an optimal information channel matching code selected by processing the fixed code word according to the space relevancy; and/or predicting the codebook at the transmitting end or the receiving end, and precoding the signal which is transmitted at the next time by the transmitting end according to the code word of the next time of the information channel predicted by the codebook. According to the method and the system, the adaptability and the precision of the cookbook can be improved, and the performance of the system can further improved.

Description

A kind of code book conversion method for updating and system
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of code book conversion method for updating and system.
Background technology
In multiple-input and multiple-output (MIMO, Multiple Input Multiple Output) system, be the system performance gain of realizing that the MIMO technology is brought, transmitting terminal need be known channel condition information (CSI, Channel State Information) usually; Frequency division multiplexing (FDD, Frequency DivisionDuplexing) system particularly, because the up-downgoing channel uses different frequency, the CSI of down channel need be obtained and mode through feedback feed back to transmitting terminal by receiving terminal.The CSI of feedback is accurate more, and the performance gain that system obtained is just obvious more, but much more infinitely CSI feeds back the bit number that needs fully, in real system, can not realize.
And because the CSI of feedback is accurate more, the number of bits of feedback that needs is just many more, therefore needs the compressed feedback bit.Be the compressed feedback bit, prior art solutions is to preset channel codebook at receiving terminal and transmitting terminal, only feeds back corresponding code word sequence number during feedback.On this basis, for improving systematic function, need good channel codebook design.Adopt the fixed codebook design in the present mimo system, fixed codebook is used
Figure BDA0000044779590000011
Generate, wherein u nIndication code the design's base vector.For the different antennae configuration, extract different column vectors as code book; The code book here is aimed at the weak channel of Rayleigh (Rayleigh), is the fixed codebook of no channel relevancy.
The inventor finds that in actual application prior art adopts the fixed codebook design, does not consider the temporal correlation and the spatial coherence of channel, because the adaptability of fixed codebook is relatively poor, therefore is unfavorable for the further raising of systematic function.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of code book conversion method for updating and system, to improve code book adaptability and precision, further improves systematic function.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of code book conversion method for updating, this method comprises:
Transmitting terminal carries out precoding and emission to signal, and receiving terminal receives signal;
Carry out the spatial coherence estimation of channel at transmitting terminal and receiving terminal; Said transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or, carrying out the code book prediction at said transmitting terminal or receiving terminal, said transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
Said transmitting terminal and receiving terminal carry out the spatial coherence of channel and estimate that transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, is specially:
Transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting;
Receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in said new code book;
Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
Saidly carry out code book prediction, be specially at transmitting terminal:
Transmitting terminal is according to the time correlation coefficient that calculates gained, and the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly.
Saidly carry out code book prediction, be specially at receiving terminal:
Receiving terminal is according to the time correlation coefficient that calculates gained, and historical channel information or code word carry out the temporal correlation prediction, obtains next code word of channel constantly, and will be said next constantly the code word sequence number of the code word correspondence of channel feed back to transmitting terminal;
Transmitting terminal reads corresponding codewords according to said code word sequence number from code book.
This method further comprises:
Receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; And obtain next code word in the new code book of channel Optimum Matching constantly based on temporal correlation prediction, with said next constantly the corresponding code word sequence number of code word in the new code book of channel Optimum Matching feed back to transmitting terminal;
Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
This method further comprises:
Receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting, in said new code book, find optimum code word, and the code word sequence number of correspondence is fed back to transmitting terminal;
Transmitting terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; In new code book, read corresponding codewords according to said code word sequence number; And carry out temporal correlation according to the historical code word of receiving terminal feedback and predict; Obtain next code word of channel constantly, utilize the code word of resulting next moment channel that said next signal of launching is constantly carried out precoding.
The said spatial coherence that in the fixed codebook of selecting, adds generates new code book, is specially:
Adopt at random unitary matrice to rotate said fixed codebook, utilize spatial coherence that postrotational code book is upgraded and carry out normalization, generate said new code book.
Mode and corresponding seed that said transmitting terminal and receiving terminal generate unitary matrice at random are identical.
The system that the present invention also provides a kind of code book conversion to upgrade, this system comprises: transmitting terminal and receiving terminal, wherein,
Said transmitting terminal is used for signal is carried out precoding and emission, and said receiving terminal is used to receive signal;
Said transmitting terminal and receiving terminal also are used to carry out the spatial coherence estimation of channel; Said transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or said transmitting terminal or receiving terminal carry out the code book prediction, and said transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
Said transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting;
Said receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in said new code book;
Said transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
Said transmitting terminal is further used for, and according to the time correlation coefficient that calculates gained, and the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly.
Said receiving terminal is further used for; According to the time correlation coefficient that calculates gained; And historical channel information or code word carry out the temporal correlation prediction, obtains next code word of channel constantly, and will be said next constantly the code word sequence number of the code word correspondence of channel feed back to transmitting terminal;
Accordingly, said transmitting terminal is further used for, and from code book, reads corresponding codewords according to said code word sequence number.
Said receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; And obtain next code word in the new code book of channel Optimum Matching constantly based on temporal correlation code book prediction, with said next constantly the corresponding code word sequence number of code word in the new code book of channel Optimum Matching feed back to transmitting terminal;
Said transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
Said receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting, in said new code book, find optimum code word, and the code word sequence number of correspondence is fed back to transmitting terminal;
Said transmitting terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; In new code book, read corresponding codewords according to said code word sequence number; And carry out temporal correlation according to the historical code word of receiving terminal feedback and predict; Obtain next code word of channel constantly, utilize the code word of resulting next moment channel that said next signal of launching is constantly carried out precoding.
Said transmitting terminal and receiving terminal adopt at random unitary matrice to rotate said fixed codebook, utilize spatial coherence that postrotational code book is upgraded and carry out normalization, generate said new code book.
Mode and corresponding seed that said transmitting terminal and receiving terminal generate unitary matrice at random are identical.
A kind of code book conversion method for updating provided by the present invention and system, transmitting terminal carries out precoding and emission to signal, and receiving terminal receives signal; Carry out the spatial coherence estimation of channel at transmitting terminal and receiving terminal; Transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or, carrying out the code book prediction at transmitting terminal or receiving terminal, transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to next signal of launching constantly.Through the present invention, can effectively reduce the error rate of Channel Transmission, improve code book adaptability and precision, further improve systematic function.
Description of drawings
Fig. 1 is a kind of code book conversion of the present invention method for updating flow chart;
Fig. 2 is the sketch map that the code book conversion of the embodiment of the invention one is upgraded;
Fig. 3 is the sketch map that the code book conversion of the embodiment of the invention two is upgraded;
Fig. 4 is the sketch map that the code book conversion of the embodiment of the invention three is upgraded.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention further is discussed in more detail.
A kind of code book conversion method for updating provided by the present invention, as shown in Figure 1, may further comprise the steps:
Step 101, transmitting terminal carries out precoding and emission to signal, and receiving terminal receives signal.
Step 102; Carry out the spatial coherence estimation of channel at transmitting terminal and receiving terminal; Transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or, carrying out the code book prediction at transmitting terminal or receiving terminal, transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
In the step 102, said transmitting terminal and receiving terminal carry out the spatial coherence of channel and estimate that transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, is specially:
Transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting;
Receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in said new code book;
Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
In the step 102, saidly carry out code book prediction, be specially at transmitting terminal:
Transmitting terminal passes through to detect the speed calculation Doppler frequency shift of receiving terminal, and according to general frequency displacement coefficient correlation computing time of reining in;
Transmitting terminal is according to said time correlation coefficient, and the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly.
In the step 102, saidly carry out code book prediction, be specially at receiving terminal:
Receiving terminal calculates Doppler frequency shift through detecting self speed, and based on Doppler frequency shift coefficient correlation computing time;
Receiving terminal is according to said time correlation coefficient, and historical channel information or code word carry out the temporal correlation prediction, obtains next code word of channel constantly, and will be said next constantly the code word sequence number of the code word correspondence of channel feed back to transmitting terminal;
Transmitting terminal reads corresponding codewords according to said code word sequence number from code book.
This shows that code book conversion update method of the present invention comprises the design of spatial coherence channel codebook and these two aspects of temporal correlation channel codebook prediction.
Wherein, spatial coherence channel codebook scheme of designing mainly comprises:
Step a1, transmitting terminal carry out precoding to signal x and launch then, and receiving terminal receives signal y:y=Hwx+n 0, wherein, H representes channel state matrix, w representes pre-coding matrix, n 0The expression additive noise.
Step a2, receiving terminal computer memory correlation, and in fixed codebook, add the new code book of spatial coherence generation.
Step a3, receiving terminal is selected optimum code word w in new code book i, and feedback code sequence number i.
Step a4; Transmitting terminal adopts the method computer memory correlation identical with receiving terminal; And in fixed codebook, adding the new code book of spatial coherence generation, the code word sequence number i according to feedback reads corresponding codewords from new code book then, utilizes this code word that next is sent signal constantly and carries out precoding.
Temporal correlation code book prediction scheme mainly comprises:
Step b1, transmitting terminal carry out precoding to signal x and launch then, and receiving terminal receives signal y:y=Hwx+n 0, wherein, H representes channel state matrix, w representes pre-coding matrix, n 0The expression additive noise.
Step b2, if receiving terminal time of implementation dependency prediction: receiving terminal carries out the temporal correlation prediction according to historical channel estimation results (being historical code word), predicts next code word w of channel constantly i, and feedback code sequence number i; Transmitting terminal reads corresponding codewords according to the code word sequence number of obtaining from code book, utilize this code word that next is sent signal constantly and carry out precoding;
If transmitting terminal time of implementation dependency prediction: receiving terminal carries out channel estimating, and feedback channel is estimated code word Wi (this is a last moment estimated channel code word), feedback code sequence number i; Transmitting terminal carries out the temporal correlation prediction according to the historical code word obtained, obtain next constantly the code word
Figure BDA0000044779590000071
of channel utilize this code word that next is sent signal constantly to carry out precoding.
In addition, combine the scheme of design of spatial coherence code book and the prediction of temporal correlation code book, can further improve systematic function, the practical implementation flow process is following:
Step c1, transmitting terminal carry out precoding to signal x and launch then, and receiving terminal receives signal y:y=Hwx+n 0, wherein, H representes channel state matrix, w representes pre-coding matrix, n 0The expression additive noise.
Step c2, if receiving terminal time of implementation dependency prediction: receiving terminal at first adopts the design of spatial coherence code book to produce new code book K New, prediction obtains next channel estimating constantly to receiving terminal according to temporal correlation then
Figure BDA0000044779590000072
And then predict next code word w of channel constantly i, w wherein i∈ K New, make
Figure BDA0000044779590000073
And feedback code sequence number i; Transmitting terminal adopts the design of spatial coherence code book to produce new code book K New, from new code book, read corresponding codewords according to the code word sequence number i that obtains, utilize this code word that next is sent signal constantly and carry out precoding;
If transmitting terminal end time of implementation dependency prediction: receiving terminal at first carries out channel estimating H, adopts the design of spatial coherence code book to produce new code book K then New, in new code book, find the channel code word W i(this is a last moment estimated channel code word) and feedback code sequence number i, transmitting terminal adopts the design of spatial coherence code book to produce new code book K New, in new code book, find corresponding code word according to the feedback sequence number; The historical code word that last basis is obtained is predicted, obtains next code word of channel constantly
Figure BDA0000044779590000074
And utilize this code word that next is sent signal constantly and carry out precoding.
Combine accompanying drawing below again, above-mentioned code book conversion update method is elaborated.
Sketch map as shown in Figure 2, as to upgrade for the code book conversion of the embodiment of the invention one is based on the spatial coherence codebook design schemes.Wherein, the performed operation of receiving terminal (like subscriber equipment) comprises:
Step 1, selection fixed codebook K Fixed, spatial coherence initial value R is set t, R r
Step 2, receiving terminal are estimated channel H.
Step 3, usefulness is unitary matrice rotation code book, i.e. K at random Rot=UK Fixed, K wherein FixedBe fixed codebook, U is unitary matrice at random.
Step 4, channel relevancy are upgraded code book and normalization, promptly wherein norm () operate for normalization.
Step 5, receiving terminal are at new code book K NewThe optimum code word w of middle selection i, and the sequence number that will select code word feeds back to transmitting terminal.Wherein, w is the code word in the code book.
Step 6, receiving terminal are upgraded correlation matrix, promptly
Figure BDA0000044779590000083
wherein v represent renewal speed.
Step 7, feed back repetition above-mentioned steps 2～6 at every turn.
The performed operation of transmitting terminal (like the base station) comprises:
Step 8, selection fixed codebook K Fixed, spatial coherence initial value R is set t, R r
Step 9, use and the same unitary matrice at random of receiving terminal rotation code book, promptly Krot=UK Fixed, K wherein FixedBe fixed codebook, U is the unitary matrice (as long as guarantee the seed of generation random matrix identical, the at random unitary matrice that generated just identical) identical with receiving terminal.
Step 10, channel relevancy are upgraded code book and normalization, promptly
Figure BDA0000044779590000084
wherein norm () operate for normalization.
Step 11, according to the code word sequence number of receiving terminal feedback at K NewIn find corresponding code word.
Step 12, transmitting terminal are upgraded correlation matrix, promptly
Figure BDA0000044779590000085
wherein v represent renewal speed.
All repeat above-mentioned steps 9～12 before step 13, the each emission.
Need to prove, be to guarantee receiving terminal and the transmitting terminal usage space correlation code book design back consistency of code book newly, produce that the seed of unitary matrice should be identical at random.
In addition, need to prove, in practical application, also can only dispose initial value R t, then above-mentionedly upgrade code book and normalized process is revised as with channel relevancy
Figure BDA0000044779590000091
Accordingly, only need in the step 12 to upgrade
Figure BDA0000044779590000092
Sketch map as shown in Figure 3, as to upgrade for the code book conversion of the embodiment of the invention two is based on temporal correlation code book prediction scheme.Wherein, the scheme in the prediction of receiving terminal (like subscriber equipment) time of implementation correlation code book comprises following operation:
Prediction prerequisite: the channel matrix { H in several moment before the receiving terminal N-1, H N-2, H N-3..., H N-lKnown
Step 1, receiving terminal are through detecting UE speed calculation Doppler frequency shift f d, and computing time coefficient correlation α n=J 0(2 π f dT n).
Step 2, known before the channel value { H in several moment N-1, H N-2, H N-3..., H N-l, next channel is constantly predicted:
Figure BDA0000044779590000093
M=1 wherein, 2,3 ....
With three rank is example;
Figure BDA0000044779590000094
utilizes least mean-square error (MMSE; MinimumMean Square Error) calculates weights; By orthogonality principle j=1 wherein, 2,3; ...
Obtain thus:
1 α 1 α 2 α 1 1 α 1 α 2 α 1 1 a 1 a 2 a 3 = α 1 α 2 α 3 , And then a 1 a 2 a 3 = 1 α 1 α 2 α 1 1 α 1 α 2 α 1 1 - 1 α 1 α 2 α 3 .
Step 3, utilize the predicted channel value, find next prediction code word
Figure BDA0000044779590000098
constantly
Step 4, receiving terminal feedback code sequence number.
Step 5, transmitting terminal find corresponding codewords according to the feedback code sequence number in code book.
Step 6, transmitting terminal utilize this code word that signal is carried out precoding.
Scheme in the prediction of transmitting terminal (like the base station) time of implementation correlation code book comprises following operation:
Prediction prerequisite: several moment feedback code book W={w before the receiving terminal N-1, w N-2, w N-3..., w N-lKnown
Step 1, transmitting terminal are through detecting UE speed calculation Doppler frequency shift f d, and computing time coefficient correlation α n=J 0(2 π f dT n).
Step 2, known before the code word value { w in several moment N-1, w N-2, w N-3..., w N-l, next code book is constantly predicted:
Figure BDA0000044779590000101
M=1 wherein, 2,3 ....
With three rank is example; utilizes MMSE to calculate weights; By orthogonality principle
Figure BDA0000044779590000103
j=1 wherein; 2; 3 ..., obtain thus:
1 α 1 α 2 α 1 1 α 1 α 2 α 1 1 a 1 a 2 a 3 = α 1 α 2 α 3 , And then a 1 a 2 a 3 = 1 α 1 α 2 α 1 1 α 1 α 2 α 1 1 - 1 α 1 α 2 α 3 .
Step 3, transmitting terminal utilization prediction code word
Figure BDA0000044779590000106
are carried out precoding to transmission signals.
Sketch map as shown in Figure 4, as to upgrade for the code book conversion of the embodiment of the invention three is based on the combination of spatial coherence codebook design schemes and temporal correlation code book prediction scheme.Wherein, carrying out the design of spatial coherence code book at receiving terminal (like subscriber equipment) comprises with the practical implementation step that the prediction of temporal correlation code book combines:
Step 1, selection fixed codebook K Fixed, spatial coherence initial value R is set t, R r
Temporal correlation Forecasting Methodology among step 2, the employing embodiment two obtains next channel estimating value constantly
Step 3, receiving terminal and transmitting terminal all adopt space correlation code book method for designing among the embodiment one, obtain normalized new code book K New
Step 4, receiving terminal are at K NewThe optimum code word of middle selection
Figure BDA0000044779590000108
And the feedback code sequence number is given transmitting terminal.
Step 5, transmitting terminal find corresponding codewords according to the feedback code sequence number, and carry out precoding to transmitting in new code book.
Step 6, upgrade correlation matrix simultaneously:
Figure BDA0000044779590000109
at transmitting terminal and receiving terminal
Carrying out the design of spatial coherence code book at transmitting terminal (like the base station) comprises with the practical implementation step that the prediction of temporal correlation code book combines:
Step 1, selection fixed codebook K Fixed, spatial coherence initial value R is set t, R r
Step 2, receiving terminal and transmitting terminal all adopt space correlation code book method for designing among the embodiment one, obtain normalized new code book K New
Step 3, receiving terminal are at K NewThe optimum code word of middle selection:
Figure BDA0000044779590000111
Receiving terminal feedback code sequence number i.
Step 4, upgrade correlation matrix simultaneously:
Figure BDA0000044779590000112
at transmitting terminal and receiving terminal
Step 5, transmitting terminal find corresponding codewords according to the feedback code sequence number in code book.
Code book value { the w in several moment before step 6, the utilization N-1, w N-2, w N-3..., w N-l, adopt next moment code word of code word prediction scheme acquisition among the embodiment two
Figure BDA0000044779590000113
Step 7, transmitting terminal utilization
Figure BDA0000044779590000114
are carried out precoding to transmission signals.
Need to prove, in practical application, can only dispose initial value R t, then above-mentionedly upgrade code book and normalized process is revised as with channel relevancy
Figure BDA0000044779590000115
Accordingly, only need in the step 4 to upgrade
Figure BDA0000044779590000116
In sum, adopt spatial coherence code book of the present invention, compare the design of existing fixed code book, can effectively reduce the error rate of Channel Transmission; Adopt temporal correlation code book prediction scheme of the present invention, also can effectively reduce the error rate of Channel Transmission; And combine design of spatial coherence code book and temporal correlation prediction scheme, and can further reduce the error rate of Channel Transmission, be preferred embodiment of the present invention.
Corresponding above-mentioned code book conversion method for updating, the system that the present invention also provides a kind of code book conversion to upgrade comprises transmitting terminal and receiving terminal.Wherein, transmitting terminal is used for signal is carried out precoding and emission, and receiving terminal is used to receive signal; Transmitting terminal and receiving terminal also are used to carry out the spatial coherence estimation of channel; Transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or transmitting terminal or receiving terminal carry out the code book prediction, and transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
Preferable, transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting; Receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in new code book; Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
Preferable, transmitting terminal is according to the time correlation coefficient that calculates gained, and the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly; Perhaps
Receiving terminal is according to the time correlation coefficient that calculates gained, and historical channel information or code word carry out the temporal correlation prediction, obtains next code word of channel constantly, and will be said next constantly the code word sequence number of the code word correspondence of channel feed back to transmitting terminal; Transmitting terminal reads corresponding codewords according to said code word sequence number from code book.
Preferable; Receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; And obtain next code word in the new code book of channel Optimum Matching constantly according to temporal correlation code book prediction, with next constantly the corresponding code word sequence number of code word in the new code book of channel Optimum Matching feed back to transmitting terminal; Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
Preferable, receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting, in new code book, find optimum code word, and the code word sequence number of correspondence is fed back to transmitting terminal; Transmitting terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; In new code book, read corresponding codewords according to said code word sequence number; And carry out temporal correlation according to the historical code word of receiving terminal feedback and predict; Obtain next code word of channel constantly, utilize the code word of resulting next moment channel that said next signal of launching is constantly carried out precoding.
Wherein, transmitting terminal and receiving terminal can adopt at random unitary matrice to rotate said fixed codebook, utilize spatial coherence that postrotational code book is upgraded and carry out normalization, generate new code book.Mode and corresponding seed that transmitting terminal and receiving terminal generate unitary matrice at random are identical.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims (16)

1. code book conversion method for updating is characterized in that this method comprises:
Transmitting terminal carries out precoding and emission to signal, and receiving terminal receives signal;
Carry out the spatial coherence estimation of channel at transmitting terminal and receiving terminal; Said transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or, carrying out the code book prediction at said transmitting terminal or receiving terminal, said transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
2. according to the said code book conversion of claim 1 method for updating; It is characterized in that; Said transmitting terminal and receiving terminal carry out the spatial coherence of channel and estimate that transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, is specially:
Transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting;
Receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in said new code book;
Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
3. according to the said code book conversion of claim 1 method for updating, it is characterized in that, saidly carry out code book prediction, be specially at transmitting terminal:
Transmitting terminal is according to the time correlation coefficient that calculates gained, and the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly.
4. according to the said code book conversion of claim 1 method for updating, it is characterized in that, saidly carry out code book prediction, be specially at receiving terminal:
Receiving terminal is according to the time correlation coefficient that calculates gained, and historical channel information or code word carry out the temporal correlation prediction, obtains next code word of channel constantly, and will be said next constantly the code word sequence number of the code word correspondence of channel feed back to transmitting terminal;
Transmitting terminal reads corresponding codewords according to said code word sequence number from code book.
5. according to the said code book conversion of claim 1 method for updating, it is characterized in that this method further comprises:
Receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; And obtain next code word in the new code book of channel Optimum Matching constantly based on temporal correlation prediction, with said next constantly the corresponding code word sequence number of code word in the new code book of channel Optimum Matching feed back to transmitting terminal;
Transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
6. according to the said code book conversion of claim 1 method for updating, it is characterized in that this method further comprises:
Receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting, in said new code book, find optimum code word, and the code word sequence number of correspondence is fed back to transmitting terminal;
Transmitting terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; In new code book, read corresponding codewords according to said code word sequence number; And carry out temporal correlation according to the historical code word of receiving terminal feedback and predict; Obtain next code word of channel constantly, utilize the code word of resulting next moment channel that said next signal of launching is constantly carried out precoding.
7. according to claim 2,5 or 6 said code book conversion method for updating, it is characterized in that the said spatial coherence that in the fixed codebook of selecting, adds generates new code book, is specially:
Adopt at random unitary matrice to rotate said fixed codebook, utilize spatial coherence that postrotational code book is upgraded and carry out normalization, generate said new code book.
8. according to the said code book conversion of claim 7 method for updating, it is characterized in that mode and corresponding seed that said transmitting terminal and receiving terminal generate unitary matrice at random are identical.
9. the system that upgrades of a code book conversion is characterized in that this system comprises: transmitting terminal and receiving terminal, wherein,
Said transmitting terminal is used for signal is carried out precoding and emission, and said receiving terminal is used to receive signal;
Said transmitting terminal and receiving terminal also are used to carry out the spatial coherence estimation of channel; Said transmitting terminal carries out precoding according to the optimum code word that receiving terminal fed back to next signal of launching constantly, and said optimum code word is according to spatial coherence fixed codebook to be handled the selected channel Optimum Matching code word in back; And/or said transmitting terminal or receiving terminal carry out the code book prediction, and said transmitting terminal carries out precoding according to the code word of next moment channel of code book prediction to said next signal of launching constantly.
10. the system that said code book conversion is upgraded according to claim 9 is characterized in that, said transmitting terminal and receiving terminal add spatial coherence respectively and generate new code book in the fixed codebook of selecting;
Said receiving terminal is selected optimum code word and the code word sequence number of correspondence is fed back to transmitting terminal in said new code book;
Said transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
11. the system that said code book conversion is upgraded according to claim 9; It is characterized in that said transmitting terminal is further used for, according to the time correlation coefficient that calculates gained; And the historical code word of receiving terminal feedback carries out the temporal correlation prediction, obtains next code word of channel constantly.
12. the system that said code book conversion is upgraded according to claim 9; It is characterized in that; Said receiving terminal is further used for, and according to the time correlation coefficient that calculates gained, and historical channel information or code word are carried out the temporal correlation prediction; Obtain next code word of channel constantly, and the corresponding code word sequence number of code word of said next moment channel is fed back to transmitting terminal;
Accordingly, said transmitting terminal is further used for, and from code book, reads corresponding codewords according to said code word sequence number.
13. the system that said code book conversion is upgraded according to claim 9; It is characterized in that; Said receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; And obtain next code word in the new code book of channel Optimum Matching constantly according to temporal correlation code book prediction, with said next constantly the corresponding code word sequence number of code word in the new code book of channel Optimum Matching feed back to transmitting terminal;
Said transmitting terminal reads corresponding codewords according to said code word sequence number from new code book, and utilizes the code word that is read that next signal of launching is constantly carried out precoding.
14. the system that said code book conversion is upgraded according to claim 9; It is characterized in that; Said receiving terminal adds spatial coherence and generates new code book in the fixed codebook of selecting, in said new code book, find optimum code word, and the code word sequence number of correspondence is fed back to transmitting terminal;
Said transmitting terminal adds spatial coherence and generates new code book in the fixed codebook of selecting; In new code book, read corresponding codewords according to said code word sequence number; And carry out temporal correlation according to the historical code word of receiving terminal feedback and predict; Obtain next code word of channel constantly, utilize the code word of resulting next moment channel that said next signal of launching is constantly carried out precoding.
15. system according to claim 10,13 or 14 said code book conversion renewals; It is characterized in that; Said transmitting terminal and receiving terminal adopt at random unitary matrice to rotate said fixed codebook, utilize spatial coherence that postrotational code book is upgraded and carry out normalization, generate said new code book.
16. the system according to the said code book conversion of claim 15 is upgraded is characterized in that, mode and corresponding seed that said transmitting terminal and receiving terminal generate unitary matrice at random are identical.
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