CN101931450B  Method for selecting codebooks and device thereof  Google Patents
Method for selecting codebooks and device thereof Download PDFInfo
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 CN101931450B CN101931450B CN200910053615A CN200910053615A CN101931450B CN 101931450 B CN101931450 B CN 101931450B CN 200910053615 A CN200910053615 A CN 200910053615A CN 200910053615 A CN200910053615 A CN 200910053615A CN 101931450 B CN101931450 B CN 101931450B
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 238000004364 calculation methods Methods 0.000 description 9
 241000893018 Armeria Species 0.000 description 7
 238000000034 methods Methods 0.000 description 7
 238000010009 beating Methods 0.000 description 3
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Abstract
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of method and apparatus of codebook selecting.
Background technology
In the closed loop transmission technology of LTE (Long Term Evolution, Long Term Evolution), after the terminal is estimated channel, select optimum code book to feed back to the base station, and adjust the signal on the transmitting antenna according to the original linearity of the optimum code that receives by the base station.The terminal selects the method for optimum code book to mainly contain based on the codebook selecting method of tolerance with based on two kinds of the codebook selecting methods of singular value decomposition.Wherein, In codebook selecting method based on tolerance; Need to obtain the pairing metric of each code book in the code book set earlier, from the metric of all code books, choose optimum metric according to presetting principle, and then the pairing code book of optimum metric is chosen for optimum code book.Here, in obtaining the code book set, in the process of the pairing metric of each code book, need find the solution metric matrix W ^{H}H ^{H}HW+ σ ^{2}I _{M}Inverse matrix in element on the diagonal.In the prior art, find the solution the inverse matrix of metric matrix through the cyclic variable numerical system earlier, extract the element on the diagonal in the inverse matrix then.
But the inventor finds under study for action, in obtaining the code book set in the process of the pairing metric of each code book, only needs the element on the diagonal in the inverse matrix of usage degree moment matrix.Yet the variable circulation method of renumbeing need intactly be calculated the inverse matrix of whole metric matrix, therefrom extracts the element on the diagonal again, and this makes the process amount of calculation that obtains metric very big.For example, when metric matrix was one 4 * 4 matrix, 4 elements on the inverse matrix diagonal, the calculating of all the other 12 elements was in fact all wasted.Finally make whole codebook selecting process because of the timeconsuming system resource of greatly having wasted.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus of codebook selecting, with conserve system resources.
The embodiment of the invention discloses a kind of method of codebook selecting, comprising: obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of each code book according to the adjoint matrix tactical deployment of troops; Obtain the metric of each code book according to the element on the diagonal in the inverse matrix of said metric matrix; From the metric of said each code book, select optimum metric according to presetting principle, will with the pairing code book of said optimum metric as optimum code book.
Preferably; Saidly obtain according to the adjoint matrix tactical deployment of troops that the element on the diagonal comprises in the inverse matrix with the pairing metric matrix of each code book: when being nonfull rank with the corresponding RI of code book; Obtain the determinant of the metric matrix corresponding with said code book difference according to input noise, channel estimate matrix and said code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of said code book; When the RI corresponding with code book is full rank; Determinant according to input noise and channel estimate matrix acquisition and the pairing metric matrix of said code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of said code book.
Preferably, the said metric that obtains each code book according to the element on the diagonal in the inverse matrix of metric matrix comprises: the signal to noise ratio that obtains each code book according to the element on the diagonal in the inverse matrix of said metric matrix; The signal to noise ratio of each code book is set to the metric of said code book; Perhaps, obtain the mean square deviation of each code book according to the element on the diagonal in the inverse matrix of said metric matrix, the mean square deviation of each code book is set to the metric of said code book.
Preferably; Saidly from the metric of said each code book, choose optimum metric according to presetting principle; To comprise as optimum code book with the pairing code book of said optimum metric:, from the signal to noise ratio of said each code book, choose maximum signal to noise ratio according to the signal to noise ratio maximization principle; Will with the pairing code book of said maximum signal to noise ratio as optimum code book; Perhaps,, from the mean square deviation of said each code book, choose Minimum Mean Square Error according to the mean square deviation minimization principle, will with the pairing code book of said Minimum Mean Square Error as optimum code book.
Preferably, said method also comprises: said optimum code book is fed back to the base station.
Preferably, saidly said optimum code book is fed back to the base station comprise: the code book numbering that each code book is set with said base station in advance jointly; The code book numbering of said optimum code book is sent to said base station, according to the corresponding relation between code book numbering of preserving and the code book, obtain said optimum code book by said base station.
The embodiment of the invention also discloses a kind of device of codebook selecting, comprising: element obtains the unit, is used for obtaining the element on the inverse matrix diagonal with the pairing metric matrix of each code book according to the adjoint matrix tactical deployment of troops; Metric obtains the unit, is used for obtaining according to the element on the inverse matrix diagonal of said metric matrix the metric of each code book; Selected cell is used for selecting optimum metric according to presetting principle from the metric of said each code book, will with the pairing code book of said metric as optimum code book.
Preferably; Said element obtains the unit and comprises: first obtains subelement; Be used for when the RI corresponding with code book is nonfull rank; Obtain and each code book determinant of corresponding metric matrix respectively according to input noise, channel estimate matrix and code book, the algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix of said and the pairing metric matrix of each code book; Second obtains subelement; Be used for when the RI corresponding with code book is full rank; Determinant according to input noise and channel estimate matrix acquisition and the pairing metric matrix of each code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix of said and the pairing metric matrix of each code book.
Preferably, said metric obtains the unit and comprises: signal to noise ratio obtains subelement, obtains the signal to noise ratio of each code book according to the element on the diagonal in the inverse matrix of said metric matrix; Signal to noise ratio is provided with subelement, and the signal to noise ratio that is used for each code book is set to the metric of said code book; Perhaps, mean square deviation obtains subelement, is used for obtaining according to the element on the inverse matrix diagonal of said metric matrix the mean square deviation of each code book, and mean square deviation is provided with subelement, and the mean square deviation that is used for each code book is set to the metric of said code book.
Preferably, said selected cell comprises: maximum signal to noise ratio chooser unit is used for from the signal to noise ratio of said each code book, choosing maximum signal to noise ratio according to the signal to noise ratio maximization principle; Maximum signal to noise ratio is provided with subelement, be used for with the pairing code book of said maximum signal to noise ratio as optimum code book; Perhaps, Minimum Mean Square Error chooser unit is used for from the mean square deviation of said each code book, choosing Minimum Mean Square Error according to the mean square deviation minimization principle; Minimum Mean Square Error is provided with subelement, be used for with the pairing code book of said Minimum Mean Square Error as optimum code book.
Preferably, said device also comprises: feedback unit is used for said optimum code book is fed back to the base station.
Preferably, said feedback unit comprises: the code book numbering is provided with subelement, is used for being provided with jointly with said base station in advance the code book numbering of each code book; Send subelement, be used for the code book numbering of said optimum code book is sent to said base station, according to the corresponding relation between code book numbering of preserving and the code book, obtain said optimum code book by said base station.
Can find out by the foregoing description; Use the adjoint matrix tactical deployment of troops to find the solution the element on the diagonal in the inverse matrix of metric matrix; Owing to can calculate each element in the inverse matrix relatively independently, and do not need circulation to renumber all elements of the whole inverse matrix of calculating the method, thereby reduced amount of calculation like variable with the adjoint matrix tactical deployment of troops; Save the time of codebook selecting, and then practiced thrift system resource.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of an embodiment of the method for a kind of codebook selecting of the present invention;
Fig. 2 the present invention is based on the codebook selecting method sketch map that mean square deviation is estimated;
Fig. 3 is the flow chart of another embodiment of the method for a kind of codebook selecting of the present invention;
Fig. 4 is the structure chart of an embodiment of the device of a kind of codebook selecting of the present invention.
Embodiment
For make abovementioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Embodiment one
See also Fig. 1, it is the flow chart of an embodiment of a kind of codebook selecting method of the present invention, and this method may further comprise the steps:
Step 101: obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of each code book according to the adjoint matrix tactical deployment of troops;
Wherein, saidly obtain according to the adjoint matrix tactical deployment of troops that the element on the diagonal comprises in the inverse matrix with the pairing metric matrix of each code book:
As the RI corresponding (rank indicator with code book; When being nonfull rank order indication); Obtain the determinant of the metric matrix corresponding with said code book difference according to input noise, channel estimate matrix and said code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of said code book;
When the RI corresponding with code book is full rank; Determinant according to input noise and channel estimate matrix acquisition and the pairing metric matrix of said code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of said code book.
Step 102: the metric that obtains each code book according to the element on the diagonal in the inverse matrix of said metric matrix;
Wherein, the said metric that obtains each code book according to the element on the diagonal in the inverse matrix of metric matrix comprises: the signal to noise ratio that obtains each code book according to the element on the diagonal in the inverse matrix of said metric matrix; The signal to noise ratio of each code book is set to the metric of said code book; Perhaps, obtain the mean square deviation of each code book according to the element on the diagonal in the inverse matrix of said metric matrix, the mean square deviation of each code book is set to the metric of said code book.
Step 103: from the metric of said each code book, select optimum metric according to presetting principle, will with the pairing code book of said optimum metric as optimum code book.
Wherein, Saidly from the metric of said each code book, choose optimum metric according to presetting principle; To comprise as optimum code book with the pairing code book of said optimum metric:, from the signal to noise ratio of said each code book, choose maximum signal to noise ratio according to the signal to noise ratio maximization principle; Will with the pairing code book of said maximum signal to noise ratio as optimum code book; Perhaps,, from the mean square deviation of said each code book, choose Minimum Mean Square Error according to the mean square deviation minimization principle, will with the pairing code book of said Minimum Mean Square Error as optimum code book.
Further, said method also comprises: said optimum code book is fed back to the base station.Specifically comprise: the code book numbering that each code book is set with said base station in advance jointly; The code book numbering of said optimum code book is sent to said base station, according to the corresponding relation between code book numbering of preserving and the code book, obtain said optimum code book by said base station.
Can find out by the foregoing description; Use the adjoint matrix tactical deployment of troops to find the solution the element on the diagonal in the inverse matrix of metric matrix; Owing to can calculate each element in the inverse matrix relatively independently, and do not need circulation to renumber all elements of the whole inverse matrix of calculating the method, thereby reduced amount of calculation like variable with the adjoint matrix tactical deployment of troops; Save the time of codebook selecting, and then practiced thrift system resource.
In addition, when the RI corresponding with code book is full rank, can directly obtain the determinant of the metric matrix of each code book, further reduce amount of calculation, and saved the time of codebook selecting, practice thrift system resource by channel estimate matrix and input noise.
Embodiment two
See also Fig. 2; It is to the present invention is based on the codebook selecting method sketch map that mean square deviation is estimated, in conjunction with Fig. 2, sees also Fig. 3; It is the structure chart of another embodiment of the method for a kind of codebook selecting of the present invention; To be estimated as example based on mean square deviation, specify the method that codebook selecting is carried out at the terminal, may further comprise the steps:
Step 301: calculate and the pairing metric matrix W of each code book according to input noise, channel estimate matrix and code book ^{H}H ^{H}HW+ σ ^{2}I _{M}
Wherein, if when there are 2 antennas in the LTE system, as the RI=1 corresponding with code book, the metric matrix of this code book is reduced to a real number, and when the RI=2 corresponding with code book, the metric matrix of this code book is 2 * 2 matrixes.
If following processing during by 4 antennas, can be done in order to reduce the amount of calculation of calculating the codebook matrix process by the LTE system, the metric matrix when calculating RI=1, RI=2, RI=3 and RI=4 is successively used A below ^{(R)}Metric matrix during expression RI=R, A _{Ij} ^{(R)}Representing matrix A ^{(R)}The capable j column element of i, make B ^{(R)}=W ^{H}H ^{H}HW, the code book W does not here carry out normalization, u _{i}The n of expression code book W _{1}I element of row, h _{i}The i row of representing matrix H, i=1,2,3,4.Wherein,
When RI=1,
When RI=2,
Nested structure by matrix can be known
Wherein, beat * element when RI=1, calculated, can directly utilize, do not need to ask for again.The element of beating respectively with element conjugation about the diagonal symmetry.
When RI=3,
Wherein, beat * element when RI=2, calculated, can directly utilize, do not need to ask for again.
The element of beating respectively with element conjugation about the diagonal symmetry.
If preceding two row of the code book W when two column elements of the code book W during corresponding RI=2 are not RI=3 then only need be chosen corresponding element and get final product.
When RI=4,
Wherein, beat * element when RI=3, calculated, can directly utilize, do not need to ask for again.The element of beating respectively with element conjugation about the diagonal symmetry.
Step 302: judge whether the RI corresponding with each code book is full rank, if, get into step 303, if not, get into step 304;
Step 303: the determinant according to input noise and channel estimate matrix acquisition and the pairing metric matrix of said code book gets into step 305;
Wherein, when the RI corresponding with code book is full rank, according to  I+AB=I+BA with
Therefore, when RI was full rank, the determinant of metric matrix and code book were irrelevant, and the determinant of the metric matrix of all code books is identical, only needed to calculate once.
Step 304: the determinant that obtains the metric matrix corresponding according to input noise, channel estimate matrix and said code book with said code book difference;
Wherein, when RI was not full rank, the determinant of metric matrix was relevant with code book, code book not simultaneously, the determinant of code book metric matrix is also different, therefore, need calculate the determinant of the metric matrix of each code book respectively.
Step 305: the algebraic complement of diagonal entry in the metric matrix and the determinant of metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix with the pairing metric matrix of said code book;
Step 306: the mean square deviation that obtains each code book according to the element on the diagonal in the inverse matrix of metric matrix;
Wherein, when carrying out codebook selecting, by formula based on mean square deviation
When carrying out codebook selecting, by formula based on signal to noise ratio
Step 307: the mean square deviation of each code book relatively, with the pairing code book of Minimum Mean Square Error as optimum code book;
Wherein, the codebook selecting based on mean square deviation MSE can be expressed as:
Codebook selecting based on signal to noise ratio snr can be expressed as:
Wherein, the subcarrier number of K for comprising in the feedback granularity, k is each subcarrier indices in the particle size range, and W is a code book, and tr (.) is a mark.
Step 308: the code book numbering of optimum code book is sent to the base station.
Wherein, Be provided with the code book numbering of each code book in advance jointly at base station and terminal; After the terminal sends to the base station with the code book of said optimum code book numbering, according to the corresponding relation between code book numbering of preserving and the code book, obtain said optimum code book by said base station.
Can find out by the foregoing description; Use the adjoint matrix tactical deployment of troops to find the solution the element on the diagonal in the inverse matrix of metric matrix; Owing to can calculate each element in the inverse matrix relatively independently, and do not need circulation to renumber all elements of the whole inverse matrix of calculating the method, thereby reduced amount of calculation like variable with the adjoint matrix tactical deployment of troops; Save the time of codebook selecting, and then practiced thrift system resource.
In addition, when the RI corresponding with code book is full rank, can directly obtain the determinant of the metric matrix of each code book, further reduce amount of calculation, and saved the time of codebook selecting, practice thrift system resource by channel estimate matrix and input noise.
Embodiment three
Corresponding with the method for abovementioned a kind of codebook selecting, the embodiment of the invention also provides a kind of device of codebook selecting.See also Fig. 4, it is an example structure figure of the device of a kind of codebook selecting of the present invention, and this device comprises: element obtains unit 401, metric obtains unit 402 and selected cell 403.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Element obtains unit 401, is used for obtaining the element on the inverse matrix diagonal with the pairing metric matrix of each code book according to the adjoint matrix tactical deployment of troops;
Metric obtains unit 402, is used for obtaining according to the element on the inverse matrix diagonal of said metric matrix the metric of each code book;
Selected cell 403 is used for selecting optimum metric according to presetting principle from the metric of said each code book, will with the pairing code book of said metric as optimum code book.
Wherein, element obtains unit 401 and comprises: first obtains subelement 4011 and second obtains subelement 4012,
First obtains subelement 4011; Be used for when the RI corresponding with code book is nonfull rank; Obtain the determinant of the metric matrix corresponding with each code book difference according to input noise, channel estimate matrix and code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix of said and the pairing metric matrix of each code book;
Second obtains subelement 4012; Be used for when the RI corresponding with code book is full rank; Determinant according to input noise and channel estimate matrix acquisition and the pairing metric matrix of each code book; The algebraic complement of diagonal entry in the said metric matrix and the determinant of said metric matrix are asked the merchant, obtain the element on the diagonal in the inverse matrix of said and the pairing metric matrix of each code book.
Wherein, metric obtains unit 402 and can comprise: noise ratio obtains subelement 4021 and with signal to noise ratio subelement 4022 is set,
Signal to noise ratio obtains subelement 4021, obtains the signal to noise ratio of each code book according to the element on the diagonal in the inverse matrix of said metric matrix;
Signal to noise ratio is provided with subelement 4022, and the signal to noise ratio that is used for each code book is set to the metric of said code book.
Perhaps; Metric obtains unit 402 and also can comprise: mean square deviation obtains subelement; Be used for obtaining according to the element on the inverse matrix diagonal of said metric matrix the mean square deviation of each code book, mean square deviation is provided with subelement, and the mean square deviation that is used for each code book is set to the metric of said code book.
Wherein, selected cell 403 can comprise: maximum signal to noise ratio chooser unit 4031 is provided with subelement 4032 with maximum signal to noise ratio,
Maximum signal to noise ratio chooser unit 4031 is used for from the signal to noise ratio of said each code book, choosing maximum signal to noise ratio according to the signal to noise ratio maximization principle;
Maximum signal to noise ratio is provided with subelement 4032, be used for with the pairing code book of said maximum signal to noise ratio as optimum code book;
Perhaps, selected cell 403 also can comprise: Minimum Mean Square Error chooser unit is used for from the mean square deviation of said each code book, choosing Minimum Mean Square Error according to the mean square deviation minimization principle; Minimum Mean Square Error is provided with subelement, be used for with the pairing code book of said Minimum Mean Square Error as optimum code book.
Further, said device also comprises: feedback unit 404 is used for said optimum code book is fed back to the base station.Wherein, feedback unit 404 comprises: the code book numbering is provided with subelement 4041 and sends subelement 4042,
The code book numbering is provided with subelement 4041, is used for being provided with jointly with said base station in advance the code book numbering of each code book;
Send subelement 4042, be used for the code book numbering of said optimum code book is sent to said base station, according to the corresponding relation between code book numbering of preserving and the code book, obtain said optimum code book by said base station.
Can find out by the foregoing description; Use the adjoint matrix tactical deployment of troops to find the solution the element on the diagonal in the inverse matrix of metric matrix; Owing to can calculate each element in the inverse matrix relatively independently, and do not need circulation to renumber all elements of the whole inverse matrix of calculating the method, thereby reduced amount of calculation like variable with the adjoint matrix tactical deployment of troops; Save the time of codebook selecting, and then practiced thrift system resource.
In addition, when the RI corresponding with code book is full rank, can directly obtain the determinant of the metric matrix of each code book, further reduce amount of calculation, and saved the time of codebook selecting, practice thrift system resource by channel estimate matrix and input noise.
Need to prove; One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium, and this program can comprise the flow process like the embodiment of abovementioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, readonly storage memory body (ReadOnly Memory, ROM) or at random store memory body (Random AccessMemory, RAM) etc.
More than the method and apparatus of a kind of codebook selecting provided by the present invention has been carried out detailed introduction; Used specific embodiment among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
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