CN101826943A - Feedback method and device of downlink channel information based on multicode book - Google Patents

Feedback method and device of downlink channel information based on multicode book Download PDF

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CN101826943A
CN101826943A CN201010173413A CN201010173413A CN101826943A CN 101826943 A CN101826943 A CN 101826943A CN 201010173413 A CN201010173413 A CN 201010173413A CN 201010173413 A CN201010173413 A CN 201010173413A CN 101826943 A CN101826943 A CN 101826943A
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code
antenna
pmi
code book
channel information
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杨勋
陈艺戬
徐俊
李儒岳
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses a feedback method of downlink channel information based on a multi-codebook, wherein a four-antenna basic codebook, an extended codebook and at least an optimized codebook capable of improving the accuracy degree for a code to reflect the downlink channel information are arranged. In the method, UE (User Equipment) selects corresponding code words from the four-antenna codebook which is a basic codebook, the extended codebook and the optimized codebook according to current downlink channel information and feeds back the serial numbers of the selected code words in the codebook per se to a base station; and the base station searches for corresponding code words from the more than two code work serial numbers sent by the UE and works out corresponding code words according to the code words, wherein the code words represent the current downlink channel information. The invention simultaneously discloses a device for realizing the method. The invention can ensure that the base station acquires the downlink channel information with high precision at low cost, thereby effectively optimizing the transmission quality of downlink signals and improving the transmission efficiency of the downlink channel.

Description

Descending channel information feedback method and device based on many code books
Technical field
The present invention relates to technology feedback of channel information and precoding technique, relate in particular to a kind of descending channel information feedback method and device based on many code books.
Background technology
In the radio communication,, can take the mode of spatial reuse to obtain higher speed if transmitting terminal and receiving terminal all use many antennas.With respect to general method for spacial multiplex, a kind of technique for enhancing is that receiving terminal feeds back to the transmitting terminal channel information, and transmitting terminal uses some emission precoding techniques according to the channel information that obtains, and can greatly improve transmission performance.Simply utilize method promptly directly to use the channel characteristics Vector Message to carry out precoding, be mainly used in single user's multiple-input and multiple-output (MIMO, Multiple Input MultipleOutput) in, some other more excellent but more complicated method is arranged also, be mainly used in the multiuser MIMO.But all need channel information more accurately.
In Long Term Evolution (LTE, Long Term Evolution) system in the works, the feedback of channel information mainly is to utilize better simply single code book feedback method, and the performance of the emission precoding technique of MIMO mainly depends on the wherein accuracy of code book feedback.The basic principle that below will quantize feedback based on the channel information of code book briefly is described below.
Suppose that the Limited Feedback channel capacity is Bbps/Hz, the number of so available code word is N=2 BIndividual.The space of feature vectors of channel matrix is through quantizing to constitute the code book space
Figure GSA00000104887000011
Transmitting terminal is with the common preservation of receiving terminal or produce this code book (sending and receiving end is identical) in real time.Each channel is realized H, receiving terminal according to certain criterion from
Figure GSA00000104887000012
Code word of mating most of middle selection with channel
Figure GSA00000104887000013
And code word sequence number i fed back to transmitting terminal.Here, code word sequence is known as and is pre-coding matrix indication (PMI, Precoding Matrix Indicator).Transmitting terminal finds corresponding pre-encoding codeword according to this sequence number i
Figure GSA00000104887000014
Thereby the acquisition channel information,
Figure GSA00000104887000015
The characteristic vector information of having represented channel.
In general
Figure GSA00000104887000021
Can be divided into the corresponding code book of a plurality of orders (Rank) further, each Rank can corresponding a plurality of code words quantize the pre-coding matrix that this Rank lower channel characteristic vector constitutes down.Because the Rank and the non-zero characteristics vector number of channel equate that therefore, the code word when in general Rank is N all can have the N row.So, code book
Figure GSA00000104887000022
Can be divided into a plurality of sub-codebooks by the difference of Rank, as shown in table 1.
The code book relation of the different orders of table 1
Figure GSA00000104887000023
In the table 1, the code word that o'clock need store in Rank＞1 all is a matrix form, and for example the code book in the LTE agreement Rel.8 version is exactly the feedback method that adopts codebook quantification, and is as shown in table 2.
4 antenna codebooks in the table 2LTE Rel.8 version
Wherein
Figure GSA00000104887000032
I is a unit matrix,
Figure GSA00000104887000033
Representing matrix W kThe j column vector.
Figure GSA00000104887000034
Representing matrix W kJ 1, j 2..., j nThe matrix that row constitute,
Figure GSA00000104887000035
Expression u nAssociate matrix; Wherein, n represents sequence number, and value is 0-15.
Table 2 is depicted as the precoding codebook of 4 antennas that are provided with among the related specifications Rel.8 of LTE system.Continue the advanced long-term evolution system (LTE-A of evolution as LTE, Long Term Evolution Advanced) needs to support bigger system bandwidth (reaching as high as 100MHz), and need to improve the spectrum efficiency of average spectral efficiency (ase) and Cell Edge User, for this reason, LTE-A need strengthen some technology, is increased to 8 antennas as the transmitting antenna number with MIMO by 4 antennas.This just needs the code book of design 8 antenna MIMO.The vector space of 8 antenna codebooks of MIMO is complicated more, and permissible accuracy is higher.Like this, 4 antenna codebook feedback quantities during the relative Rel.8 of the feedback quantity of 8 antenna codebooks will increase to some extent.Under the prerequisite that guarantees 8 antenna MIMO performances,, provided the design principle of the MIMO code book of 8 antennas in the LTE-A system for further reducing expense:
1) precoding/feedback arrangement of a subband is made up of two matrixes.In the standard of LTE, the minimum feedback unit of channel information is subband (Subband), and (RB ResourceBlock) forms a subband, and each RB is made up of a plurality of Resource Units (RE, Resource Element) by several Resource Block; RE is the least unit of running time-frequency resource among the LTE, has continued to use the resource representation method of LTE among the LTE-A.The precoding structure is meant the precoding that UE recommends to the base station, in fact also is the method for expressing of channel information.
2) structure of this precoding/feedback can be applied to all transmitting antenna array configurations.
3) each matrix in two matrixes all is under the jurisdiction of an independent code book.Code book is known by base station and UE simultaneously in advance.Code book can change on different time and different subband to some extent.
4) the matrix notation broadband or the attribute of channel when long.Another matrix notation is determined on the frequency band or the attribute of channel in short-term.
5) employed matrix code book is represented with the form of limited denumerable matrix stack, and for UE and base station, the matrix of each RB all is as can be known.
6) Rel-8 precoding feedback can be considered as the special shape of this kind structure.
According to above-mentioned design principle, in the 8 antenna codebooks design of MIMO, need be with 2 code book CB 1And CB 2Be configured in UE and base station end simultaneously.After UE is obtaining channel information, from CB 1And CB 2In choose suitable code word w respectively 1And w 2, to base station feedback w 1And w 2PMI 1And PMI 2After the base station obtains corresponding two PMI, from existing two code book CB 1And CB 2In choose two code word w respectively 1And w 2, calculate the pre-coding matrix w that needs by predetermined functional relation then, be shown below, wherein, F 2The predetermined functional relation of () expression can be taked forms such as two dot product, Kronecker between the code word of representing with matrix form are long-pending.
v＝F 2(w 1，w 2)
Based on above-mentioned design constraint, different specific code present design has been proposed at present.Mainly contain two kinds of schemes.
A kind of scheme thinks that dicode effect originally is to increase the precision of 8 antenna codebooks, so, this scheme is chosen basic code word from the ground floor code book, choose code word again from another layer code book basic code word is carried out self adaptation adjustment or non-self-adapting adjustment, to obtain the higher code word of precision.
Another program thinks that then dicode effect originally is that 4 antenna codebooks with LTE Rel.8 expand to 8 antenna codebooks of Rel.10.So this scheme is considered as 4 antenna codebooks of Rel.8 with the ground floor code book, chooses corresponding codewords from second layer code book, obtain 8 antenna codebooks by the two predetermined associated methods.
The advantage of first kind of scheme is to utilize technology such as existing self adaptation, difference effectively to improve the accuracy of code word reflection descending channel information, but can't embody the effective inheritance to existing 4 antenna codebooks of Rel.8.The advantage of second kind of scheme is to inherit effectively 4 antenna codebooks of Rel.8, but shortcoming is can not introduce advanced technologies such as present advanced person's adaptive codebook, difference code book 8 antenna code words are optimized enhancing, reflects descending channel information more accurately.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of descending channel information feedback method and device based on many code books, can compatible prior LTE system.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of descending channel information feedback method based on many code books is provided with plural code book at UE end and base station end simultaneously, and comprising one 4 antenna codebook at least in described two above code books is Basic codebook CB 1, an expansion code book CB who 4 antenna code words is expanded to 8 antenna code words 2, an optimization code book CB who improves code word reflection descending channel information accuracy 3
The Basic codebook here can adopt the descending MIMO code book of 4 antennas in the existing LTE Rel.8 version, also can adopt other the descending MIMO code book of 4 antennas.Be without loss of generality, the optimization code book can have a plurality of, and promptly optimizing code book has CB 3, CB 4... CB n, n 〉=3.
The base station is found corresponding code word W MI according to the PMI of UE feedback in corresponding code book 1, WMI 2... WMI n, and according to predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated, obtain characterizing the code word of channel information.Predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated as:
Utilize the long-pending form of product or Kronecker Kronecker that four antenna code words in the described Basic codebook of feedback PMI correspondence are expanded to eight antenna code words, the code word in the described optimization code book of PMI correspondence that utilization is again fed back is optimized eight antenna code words;
Perhaps, code word in the described optimization code book of PMI correspondence that utilization is fed back is optimized four antenna code words in the described Basic codebook of feedback PMI correspondence, utilizes the long-pending form of product or Kronecker Kronecker that the four antenna code words of being optimized are expanded to eight antenna code words again.
Described method comprises:
User terminal UE according to current descending channel information from described Basic codebook CB 1, described expansion code book CB 2With described optimization code book CB 3, CB 4... CB nIn choose corresponding code word w 1, w 2, w 3... w n, and with the sequence number PMI in code book separately of selected code word 1, PMI 2... PMI nFeed back to the base station.
The base station receives the pre-coding matrix sequence number sequence PMI of UE feedback 1, PMI 2... PMI nAfter, according to described pre-coding matrix sequence number sequence PMI 1, PMI 2... PMI nFrom described Basic codebook CB 1, described expansion code book CB 2With described optimization code book CB 3, CB 4... CB nIn choose corresponding code word w 1, w 2, w 3... w n
The base station is with w 1, w 2, w 3... w nThe input predetermined algorithm calculates code word v 2, code word v 2Reflected descending channel information.Algorithm can be used the function representation shown in the following formula.
v 2＝F n(w 1，w 2，w 3，…w n)
If w 3... w nWhen all being 4 antenna code words, function F nCan be decomposed into two step function calculation:
v 1＝G 1(w 1，w 3，…w n)
v 2＝G 2(v 1，w 2)
If w 3... w nWhen all being 8 antenna code words, function F nCan be decomposed into two step function calculation:
v 1＝G 3(w 1，w 2)
v 2＝G 4(v 1，w 3，…w n)
Here, function G 1And G 4Be Optimizing operation, function G 2And G 3It is extended operation.
A kind of descending channel information feedback device, described device based on many code books comprise the unit be set, choose the unit, feedback unit, receiving element and computing unit.Wherein:
The unit is set, is used at UE end and base station end plural code book being set simultaneously, comprising one 4 antenna codebook at least in described two above code books is Basic codebook CB 1, an expansion code book CB who 4 antenna code words is expanded to 8 antenna code words 2, at least one improves the optimization code book CB of code word reflection descending channel information accuracy 3, CB 4... CB n, n 〉=3.
Choose the unit, being used for UE is Basic codebook CB according to current descending channel information from described 4 antenna codebooks 1, described expansion code book CB 2With described optimization code book CB 3, CB 4... CB nIn choose corresponding code word w 1, w 2, w 3... w n
Feedback unit is used for UE with selected code word w 1, w 2, w 3... w nSequence number PMI in selected code book 1, PMI 2... PMI nFeed back to the base station.
Receiving element is used for the base station and receives the PMI sequence PMI that the UE feedback is come 1, PMI 2... PMI n
Corresponding unit is used for the base station with the code word sequence number sequence PMI that receives 1, PMI 2... PMI nCorrespondence is obtained corresponding code word w in corresponding code book 1, w 2, w 3... w n
Computing unit is used for the base station according to the code word w that will obtain 1, w 2, w 3... w nThe input predefined function calculates the code word v that characterizes descending channel information 2
Obtain the code word v of sign descending channel information based on the feedback method of many PMI of many code books by employing 2, system can under the comprehensive channel environment, embody better inheritance and more excellent throughput performance under situation that solid size is originally the same with this expense of dicode relatively.
Description of drawings
Fig. 1 is the flow chart that the present invention is based on the descending channel information feedback method embodiment one of many code books;
Fig. 2 is the flow chart that the present invention is based on the descending channel information feedback method embodiment two of many code books;
Fig. 3 is the flow chart that the present invention is based on the descending channel information feedback method embodiment three of many code books;
Fig. 4 is the flow chart that the present invention is based on the descending channel information feedback method embodiment four of many code books;
Fig. 5 is the flow chart that the present invention is based on the descending channel information feedback method embodiment five of many code books;
Fig. 6 is the flow chart that the present invention is based on the descending channel information feedback method embodiment six of many code books;
Fig. 7 is a kind of composition structural representation that the present invention is based on the descending channel information feedback device of many code books;
Fig. 8 is that the another kind that the present invention is based on the descending channel information feedback device of many code books is formed structural representation.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Embodiment one
Fig. 1 is the flow chart that the present invention is based on the descending channel information feedback method embodiment one of many code books, and as shown in Figure 1, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 101: dispose 4 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3And CB 4Wherein, CB 1Be 4 antenna codebooks of LTE Rel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that 4 antenna code words are expanded to 8 antenna code words.CB 3And CB 4Be to optimize code book, effect is the characteristic vector of expression down channel correlation matrix R, and can recover corresponding R, and can use the R self adaptation to improve the accuracy that the 4 antenna basic code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3And CB 4In code word be respectively 4 * 1,2 * 1,4 * 1,4 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3And CB 4Only be mathematic parameter, no longer provide concrete example here.
Step 102:UE is according to current channel condition, the 4 identical antenna channel correlation matrix R of polarised direction that added up, from code book CB 1, CB 2, CB 3And CB 4In select corresponding code word w respectively 1, w 2, w 3And w 4, according to selected code word w 1, w 2, w 3And w 4Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3And PMI 4
Step 103:UE is with PMI 1, PMI 2, PMI 3And PMI 4Send to the base station by up signaling.
Step 104: the base station is according to PMI 1, PMI 2, PMI 3And PMI 4From code book CB 1, CB 2, CB 3And CB 4In select corresponding code word w respectively 1, w 2, w 3And w 4
Step 105: by w 3And w 4Use following formula to calculate down channel correlation matrix R
R＝norm(w 3 Hw 3+αw 4 H?w 4)
Here, norm representation unitization, parameter alpha are predefined parameters.Symbol H represents transpose conjugate.
Step 106: the base station uses following formula to calculate v 1, wherein, v 1It is 4 * 1 matrix.
v 1 = R 1 2 w 1
Step 107: the base station utilizes the v that calculates in following formula and the step 106 1Calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2 = w 2 ⊗ v 1
Embodiment two
Fig. 2 is the flow chart that the present invention is based on the descending channel information feedback method embodiment two of many code books, and as shown in Figure 2, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 201: dispose 3 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3Wherein, CB 1Be 4 antenna codebooks of LTERel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that 4 antenna code words are expanded to 8 antenna code words.CB 3Be the difference code book, effect is by remedying the deviation of the represented descending channel information of Basic codebook with true descending channel information, improving the accuracy that the 4 antenna basic code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3In code word be respectively 4 * 1,2 * 1,4 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3Only be mathematic parameter, no longer provide concrete example here.
Step 202:UE is according to current descending channel information, from code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3, according to selected code word w 1, w 2, w 3Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3
Step 203:UE is with PMI 1, PMI 2, PMI 3Send to the base station by up signaling.
Step 204: the base station is according to PMI 1, PMI 2, PMI 3From code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3
Step 205: the base station uses following formula to calculate v 1, wherein, v 1It is 4 * 1 matrix.
v 1＝w 1+w 3
Step 206: following formula and v are used in the base station 1Calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2 = w 2 ⊗ v 1
Embodiment three
Fig. 3 is the flow chart that the present invention is based on the descending channel information feedback method embodiment three of many code books, and as shown in Figure 3, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 301: dispose 3 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3Wherein, CB 1Be 4 antenna codebooks of LTERel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that 4 antenna code words are expanded to 8 antenna code words.CB 3Be the secondary code book, effect is by remedying the deviation of the represented descending channel information of Basic codebook with true descending channel information, improving the accuracy that the 4 antenna basic code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3In code word be respectively 4 * 1,2 * 1,4 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3Only be mathematic parameter, no longer provide concrete example here.
Step 302:UE is according to current descending channel information, from code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3, according to selected code word w 1, w 2, w 3Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3
Step 303:UE is with PMI 1, PMI 2, PMI 3Send to the base station by up signaling.
Step 304: the base station is according to PMI 1, PMI 2, PMI 3From code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3
Step 305: the base station uses following formula to calculate spin matrix Q, and Q is 4 * 4 matrix.
Q＝f(w 1)
Function f is definite according to concrete being provided with.
Step 306: the base station uses following formula to calculate v 1, wherein, v 1It is 4 * 1 matrix.
v 1＝Qw 3
Step 306: following formula and v are used in the base station 1Calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2 = w 2 ⊗ v 1
Embodiment four
Fig. 4 is the flow chart that the present invention is based on the descending channel information feedback method embodiment four of many code books, and as shown in Figure 4, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 401: dispose 4 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3And CB 4Wherein, CB 1Be 4 antenna codebooks of LTE Rel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that the basic code word with 4 antennas expands to 8 antenna code words.CB 3And CB 4Be to optimize code book, effect is the characteristic vector of expression down channel correlation matrix R, and can recover corresponding R, and can use the R self adaptation to improve the accuracy that the 8 antenna code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3And CB 4In code word be respectively 4 * 1,2 * 1,8 * 1,8 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3And CB 4Only be mathematic parameter, no longer provide concrete example here.
Step 402:UE is according to current channel condition, the 4 identical antenna channel correlation matrix R of polarised direction that added up, from code book CB 1, CB 2, CB 3And CB 4In select corresponding code word w respectively 1, w 2, w 3And w 4, according to selected code word w 1, w 2, w 3And w 4Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3And PMI 4
Step 403:UE is with PMI 1, PMI 2, PMI 3And PMI 4Send to the base station by up signaling.
Step 404: the base station is according to PMI 1, PMI 2, PMI 3And PMI 4From code book CB 1, CB 2, CB 3And CB 4In select corresponding code word w respectively 1, w 2, w 3And w 4
Step 405: the base station utilizes following formula to calculate v 1, wherein, v 1It is 8 * 1 matrix.
v 1 = w 2 ⊗ w 1
Step 406: by w 3And w 4Use following formula to calculate down channel correlation matrix R
R＝norm(w 3 Hw 3+αw 4 H?w 4)
Here, norm representation unitization, parameter alpha are predefined parameters.Symbol H represents transpose conjugate.
Step 407: the base station uses following formula to calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2 = R 1 2 v 1
Embodiment five
Fig. 5 is the flow chart that the present invention is based on the descending channel information feedback method embodiment five of many code books, and as shown in Figure 5, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 501: dispose 3 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3Wherein, CB 1Be 4 antenna codebooks of LTERel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that 4 antenna code words are expanded to 8 antenna code words.CB 3Be the difference code book, effect is by remedying the deviation of the represented descending channel information of Basic codebook with true descending channel information, improving the accuracy that the 4 antenna basic code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3In code word be respectively 4 * 1,2 * 1,8 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3Only be mathematic parameter, no longer provide concrete example here.
Step 502:UE is according to current descending channel information, from code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3, according to selected code word w 1, w 2, w 3Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3
Step 503:UE is with PMI 1, PMI 2, PMI 3Send to the base station by up signaling.
Step 504: the base station is according to PMI 1, PMI 2, PMI 3From code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3
Step 505: the base station utilizes following formula to calculate v 1, wherein, v 1It is 8 * 1 matrix.
v 1 = w 2 ⊗ w 1
Step 506: the base station uses following formula to calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2＝v 1+w 3
Embodiment six
Fig. 6 is the flow chart that the present invention is based on the descending channel information feedback method embodiment six of many code books, and as shown in Figure 6, this example may further comprise the steps based on the descending channel information feedback method of many code books:
Step 601: dispose 3 cover code book CB simultaneously at UE and base station 1, CB 2, CB 3Wherein, CB 1Be 4 antenna codebooks of LTERel.8, that is to say CB 1It is the code book of 4 antenna technologies in the compatible fully existing LTE system.CB 2Be the expansion code book, effect is that 4 antenna code words are expanded to 8 antenna code words.CB 3Be the secondary code book, effect is by remedying the deviation of the represented descending channel information of Basic codebook with true descending channel information, improving the accuracy that the 4 antenna basic code word tables that are selected show descending channel information.Above-mentioned CB 1, CB 2, CB 3In code word be respectively 4 * 1,2 * 1,8 * 1 matrix.It will be appreciated by those skilled in the art that and consider CB 2, CB 3Only be mathematic parameter, no longer provide concrete example here.
Step 602:UE is according to current descending channel information, from code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3, according to selected code word w 1, w 2, w 3Determine that respectively its sequence number in code book separately is PMI, be respectively PMI 1, PMI 2, PMI 3
Step 603:UE is with PMI 1, PMI 2, PMI 3Send to the base station by up signaling.
Step 604: the base station is according to PMI 1, PMI 2, PMI 3From code book CB 1, CB 2, CB 3In select corresponding code word w respectively 1, w 2, w 3
Step 605: the base station utilizes following formula to calculate v 1, wherein, v 1It is 8 * 1 matrix.
v 1 = w 2 ⊗ w 1
Step 606: the base station uses following formula to calculate spin matrix Q, and Q is 8 * 8 matrix.
Q＝f(v 1)
Function f is definite according to concrete being provided with.
Step 607: the base station uses following formula to calculate v 2, wherein, v 2It is 8 * 1 matrix.v 2Represented descending channel information.
v 2＝Qw 3
Fig. 7 is a kind of composition structural representation that the present invention is based on the descending channel information feedback device of many code books, and as shown in Figure 7, the descending channel information feedback device that the present invention is based on many code books comprises and unit 70 is set, chooses unit 71 and feedback unit 72.Wherein:
Unit 70 is set, is used at UE end and base station end plural code book being set simultaneously, comprising one 4 antenna codebook at least in described two above code books is Basic codebook CB 1, an expansion code book CB who 4 antenna code words is expanded to 8 antenna code words 2, at least one improves the optimization code book CB of code word reflection descending channel information accuracy 3, CB 4... CB n, n 〉=3.
Choose unit 71, being used for UE is Basic codebook CB according to current descending channel information from described 4 antenna codebooks 1, described expansion code book CB 2With described optimization code book CB 3, CB 4... CB nIn choose corresponding code word w 1, w 2, w 3... w n
Feedback unit 72 is used for UE with selected code word w 1, w 2, w 3... w nSequence number PMI in selected code book 1, PMI 2... PMI nFeed back to the base station.
Fig. 8 is a kind of composition structural representation that the present invention is based on the descending channel information feedback device of many code books, as shown in Figure 8, on the basis of device shown in Figure 7, the descending channel information feedback device that the present invention is based on many code books also comprises receiving element 73, corresponding unit 74 and computing unit 75; Wherein:
Receiving element 73 is used for the base station and receives the PMI sequence PMI that the UE feedback is come 1, PMI 2... PMI n
Corresponding unit 74 is used for the base station with the code word sequence number sequence PMI that receives 1, PMI 2... PMI nCorrespondence is obtained corresponding code word w in corresponding code book 1, w 2, w 3... w n
Computing unit 75 is used for the base station according to the code word w that will obtain 1, w 2, w 3... w nThe input predefined function calculates the code word v that characterizes descending channel information 2Concrete, computing unit 75 is used for the (WMI according to predefined function F 1, WMI 2... WMI n) code word that is found is calculated, obtain characterizing the code word of channel information.Above-mentioned predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated as: utilize the long-pending form of product or Kronecker Kronecker that four antenna code words in the described Basic codebook of feedback PMI correspondence are expanded to eight antenna code words, the code word in the described optimization code book of PMI correspondence that utilization is again fed back is optimized eight antenna code words; Perhaps, code word in the described optimization code book of PMI correspondence that utilization is fed back is optimized four antenna code words in the described Basic codebook of feedback PMI correspondence, utilizes the long-pending form of product or Kronecker Kronecker that the four antenna code words of being optimized are expanded to eight antenna code words again.
The function that it will be appreciated by those skilled in the art that each processing unit in the device shown in Figure 7 can realize by the program that runs on the processor, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (10)

  1. Under the antenna based on the descending channel information feedback method of many code books, it is characterized in that, the Basic codebook of one four antenna, expansion code book are set and at least one optimizes code book; Described method comprises:
    User terminal UE chooses corresponding code word according to current descending channel information from described Basic codebook, described expansion code book and described optimization code book, and the pre-coding matrix indication PMI in code book separately of selected code word is fed back to the base station.
  2. 2. method according to claim 1 is characterized in that, described method also comprises:
    The base station is found corresponding code word W MI according to the PMI of UE feedback in corresponding code book 1, WMI 2... WMI n, and according to predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated, obtain characterizing the code word of channel information.
  3. 3. method according to claim 2 is characterized in that, predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated as:
    Utilize the long-pending form of product or Kronecker Kronecker that four antenna code words in the described Basic codebook of feedback PMI correspondence are expanded to eight antenna code words, the code word in the described optimization code book of PMI correspondence that utilization is again fed back is optimized eight antenna code words;
    Perhaps, code word in the described optimization code book of PMI correspondence that utilization is fed back is optimized four antenna code words in the described Basic codebook of feedback PMI correspondence, utilizes the long-pending form of product or Kronecker Kronecker that the four antenna code words of being optimized are expanded to eight antenna code words again.
  4. 4. method according to claim 1 is characterized in that, the code word of described expansion code book is used at least a of following function:
    The code word that is selected in the described Basic codebook is expanded to eight antenna code words;
    Four antenna code words after described optimization Optimization of Codebook are expanded to eight antenna code words.
  5. 5. method according to claim 1 is characterized in that, described method also comprises:
    When described expansion code book was used for being selected code word and expanding to eight antenna code words of described Basic codebook, described optimization code book was used to improve the precision of eight antenna code words after the expansion of expansion code book;
    Described expansion code book is used for four antenna code words after described optimization Optimization of Codebook are expanded to eight antenna code words, and described optimization code book is used for improving the precision from the selected code word of Basic codebook.
  6. Under the antenna based on the descending channel information feedback device of many code books, it is characterized in that described device comprises and the unit is set, chooses unit and feedback unit; Wherein:
    The unit is set, is used to be provided with the Basic codebook of one four antenna, an expansion code book and at least one optimization code book;
    Choose the unit, be used for choosing corresponding code word from the Basic codebook of described four antennas, described expansion code book and described optimization code book according to current descending channel information;
    Feedback unit, what be used for selected code word is that PMI feeds back to the base station in the sequence number of code book separately.
  7. 7. device according to claim 6 is characterized in that described device also comprises receiving element, corresponding unit and computing unit; Wherein:
    Receiving element is used to receive the PMI that UE feeds back;
    Corresponding unit, the PMI that is used for receiving obtains corresponding code word W MI in corresponding code book correspondence 1, WMI 2... WMI n
    Computing unit is used for the (WMI according to predefined function F 1, WMI 2... WMI n) code word that is found is calculated, obtain characterizing the code word of channel information.
  8. 8. device according to claim 7 is characterized in that, predefined function F (WMI 1, WMI 2... WMI n) code word that is found is calculated as:
    Utilize the long-pending form of product or Kronecker Kronecker that four antenna code words in the described Basic codebook of feedback PMI correspondence are expanded to eight antenna code words, the code word in the described optimization code book of PMI correspondence that utilization is again fed back is optimized eight antenna code words;
    Perhaps, code word in the described optimization code book of PMI correspondence that utilization is fed back is optimized four antenna code words in the described Basic codebook of feedback PMI correspondence, utilizes the long-pending form of product or Kronecker Kronecker that the four antenna code words of being optimized are expanded to eight antenna code words again.
  9. 9. device according to claim 6 is characterized in that, the code word of described expansion code book is used at least a of following function:
    The code word that is selected in the described Basic codebook is expanded to eight antenna code words;
    Four antenna code words after described optimization Optimization of Codebook are expanded to eight antenna code words.
  10. 10. device according to claim 6 is characterized in that, when described expansion code book was used for being selected code word and expanding to eight antenna code words of described Basic codebook, described optimization code book was used to improve the precision of eight antenna code words after the expansion of expansion code book;
    Described expansion code book is used for four antenna code words after described optimization Optimization of Codebook are expanded to eight antenna code words, and described optimization code book is used for improving the precision from the selected code word of Basic codebook.
CN201010173413A 2010-04-30 2010-04-30 Feedback method and device of downlink channel information based on multicode book Pending CN101826943A (en)

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CN105027463A (en) * 2013-03-08 2015-11-04 高通股份有限公司 Systems and methods for enhanced MIMO operation
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