CN101777968B - Method, system and mobile terminal for transmitting channel information - Google Patents
Method, system and mobile terminal for transmitting channel information Download PDFInfo
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Abstract
The invention discloses a method, a system and a mobile terminal for transmitting channel information. The method comprises the following steps: determining the quantitative information PN of N number of channel eigenvectors by the mobile terminal, wherein N is an integer which is larger than 1; according to a codebook the sequence of which is 1, namely R1, and a function F (PN, R1), calculating to obtain a vector muster which is orthogonal with the quantitative information PN and corresponds to the codon of an R1 codebook; determining a vector and an index I which is in the R1 codebook and corresponds to the vector from the vector muster by the mobile terminal; transmitting the quantitative information PN and the index I to a base station; finding out the quantitative information of the (N+1)th eigenvector by the base station according to a vector RI1 which is in the R1 codebook and corresponds to the index I, the function F (PN, RI1) and the quantitative information PN; and obtaining a matrix muster according to a codebook RM the sequence of which is M and a function F (PN, RM). The invention can effectively reduce the complexity of codon selection and calculation, and improve the quantizing precision.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of method and system and mobile terminal of transmitting channel information.
Background technology
In wireless communication system, if transmitting terminal and receiving terminal all use many antennas, the mode of spatial reuse can be taked obtain higher message transmission rate.Relative to general method for spacial multiplex, a kind of technology of enhancing is that receiving terminal feeds back to transmitting terminal channel information, and transmitting terminal uses some to launch precoding technique according to the channel information obtained, and improves transmission performance greatly.Simple implementation method directly uses channel characteristics Vector Message to carry out precoding, be mainly used in single user multiple-input, multiple-output (Multiple InputMultiple Output, be called for short MIMO) in system, also some other more excellent but more complicated method is had, be mainly used in multi-user MIMO system, the prerequisite realizing the method needs channel information more accurately.
The channel information of feedback is generally divided into two parts, comprising: characteristic value information and characteristic vector information.Unless otherwise indicated, the characteristic value referred to here and characteristic vector mainly refer to non-zero characteristic value and non-zero characteristic value characteristic of correspondence vector.The characteristic vector number of channel is relevant with the order (Rank) of channel, and generally speaking, after channel matrix carries out feature decomposition, its message structure is as shown in table 1:
Table 1
| Eigenvalue λ 1 | Eigenvalue λ 2 | … | Eigenvalue λ n |
| Characteristic vector V 1 | Characteristic vector V 2 | … | Characteristic vector V n |
The performance of mimo system depends on the accuracy of the characteristic vector wherein fed back.
In long evolving system (Long Term Evolution is called for short LTE), the feedback of characteristic vector mainly utilizes the feedback method of code book.
The general principle fed back based on the quantitative information of the channel information of code book is, supposes that Limited Feedback channel capacity is B bps/Hz, so can the number of code word be N=2
bindividual.The space of feature vectors of channel information is through quantizing to form codebook space
this code book (sending and receiving end is identical) is preserved or produced in real time to transmitting terminal and receiving terminal jointly.Receiving terminal according to certain criterion from
middle selection code word of mating most with channel
, and code word sequence number is fed back to transmitting terminal, transmitting terminal finds pre-encoding codeword according to this sequence number
, obtain channel information, mainly the characteristic vector information of channel.
In general
further can be divided into the code book that multiple order (Rank) is corresponding, under each order, corresponding multiple code word can quantize the pre-coding matrix that the channel characteristics vector under this order forms.Because the sum of ranks non-zero characteristics vector number of channel is equal, therefore, code word when in general order is N all can have N to arrange. so can code book
multiple sub-codebook is divided into by order, as shown in table 2.
Table 2
Wherein, need the code word stored to be all matrix form when Rank > 1, such as, code book in LTE protocol is exactly the feedback method of this codebook quantification adopted.
Concrete, the precoding codebook of descending 4 antennas is as shown in table 3:
Table 3
As advanced long-term evolution system (the Long Term EvolutionAdvanced of the evolution standard of LTE, be called for short LTE-A) need to support larger system bandwidth (reaching as high as 100MHz), and need the spectrum efficiency improving average spectral efficiency (ase) and Cell Edge User, for this reason, LTE-A needs to strengthen some technology, as MU-MIMO.
Existing code book feedback technique adopts the quantization method of matrix form, for the quantification of multiple characteristic vector, have employed the code word with same number when quantizing 1 characteristic vector, be all 16, although quantified precision step-down, SU-MIMO is not high to characteristic vector quantization error sensitiveness.In MU-MIMO, the quantization error that this method is brought can cause multi-User Performance degradation, especially declines clearly when high order, and therefore the feedback of characteristic vector needs higher expense.And different orders needs some differences.
Prior art 1:
This theoretical method can be good at the performance improving feedback, but because the size of code word is with code word overhead exponentially level growth, if N is comparatively large, and when M is larger.The defect that 2 aspects are serious can be there is: (1) codebook size storage problem (2) codebook selecting problem
As shown in table 4, such as, during 8Tx, LTE-A is Rank=8 to the maximum, supposes N=6bit, during M=8, Rank1 code book is 64 8 n dimensional vector ns, and Rank=2 code book is the matrix of 4096 8 × 2, and Rank=3 code book is the matrix of 262144 8 × 3, the code book of Rank=4 is the matrix of 16777216 Rank=4, reaches 281,000,000,000,000 matrixes during Rank=8.
The problem brought thus is: UE memory space needs very huge, and UE, when doing codebook selecting, needs to carry out very huge computing.
Table 4:
Prior art 2:
The code book of a definition Rank1, when the 1st characteristic vector is quantized, find out from Rank1 code book one with its codeword vector mated most, during to the 2nd characteristic vector quantification, find out from Rank1 code book one with its characteristic vector mated most, by that analogy.
The shortcoming of this method is to there is orthogonality relation between characteristic vector, and in the codebook design of prior art 1, the matrix code word of design, its each row are all orthogonal, and in prior art 2, can not embody this relation.If force to limit this relation, can cause after characteristic vector has above quantized, the optional code word space in the codebook of characteristic vector below just seldom.Such as, the Rank1 code book of a 6bit, wherein has 64 vectors, selects one of them vector P1 to characteristic vector V
1after quantizing, then to V
2when quantizing, optional code word scope is vector orthogonal with P1 in code book, and actual conditions are, optional code word is former is less than 64, and by that analogy, when the 3rd characteristic vector quantizes, optional code word can be less.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and system and mobile terminal of transmitting channel information, reduces codeword selection computation complexity, improves quantified precision.
In order to solve the problem, the invention provides a kind of method of transmitting channel information, comprising: mobile terminal determines the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) calculate and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, described mobile terminal determines that from described set of vectors a vector and this vector are at R
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer; Described base station according to described index I at R
1corresponding vector R is found in code book
i 1, and according to described function F (P
n, R
i 1) and described quantitative information P
nknow the quantitative information of N+1 characteristic vector.
Further, said method also has following characteristics:
Described base station knows that the concrete grammar of the quantitative information of top n characteristic vector comprises: described mobile terminal is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to described base station; Described base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
Further, said method also has following characteristics:
Described N number of channel characteristics vector is by top n characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
1the bit number that code book is corresponding is that the value of K, K is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
Further, said method also has following characteristics:
The channel characteristics vector that described mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0, described N number of channel characteristics vector is by N number of characteristic value characteristic of correspondence vector after in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
1the bit number that code book is corresponding is that the value of K, K is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
In order to solve the problems of the technologies described above, present invention also offers a kind of system of transmitting channel information, comprise mobile terminal and base station, described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) calculate and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, determines that from described set of vectors a vector and this vector are at R
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer; Described base station, for according to described index I at R
1corresponding vector R is found in code book
i 1, and according to described function F (P
n, R
i 1) and described quantitative information P
nknow the quantitative information of N+1 characteristic vector.
In order to solve the problems of the technologies described above, present invention also offers a kind of mobile terminal of transmitting channel information, described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) calculate and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, determines that from described set of vectors a vector and this vector are at R
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer.
In order to solve the problems of the technologies described above, present invention also offers a kind of method of transmitting channel information, comprising: mobile terminal determines the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) calculate and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, described mobile terminal determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector from described set of matrices, and determines that this M characteristic vector is at R
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer; Described base station according to described index I at R
mcorresponding vector R is found in code book
i m, and according to described function F (P
n, R
i m) and described quantitative information P
nknow the quantitative information of N+1 to N+M characteristic vector.
Further, said method also has following characteristics:
Described base station knows that the concrete grammar of the quantitative information of top n characteristic vector comprises: described mobile terminal is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to described base station; Described base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
Further, said method also has following characteristics:
Described N number of channel characteristics vector is by top n characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
mthe bit number that code book is corresponding is K, and the average feedback expense of each characteristic vector is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
Further, said method also has following characteristics:
The channel characteristics vector that described mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0, described N number of channel characteristics vector is by N number of characteristic value characteristic of correspondence vector after in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
mthe bit number that code book is corresponding is K, and the average feedback expense of each characteristic vector is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
In order to solve the problems of the technologies described above, present invention also offers a kind of system of transmitting channel information, comprise mobile terminal and base station, described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) calculate and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector, and determines that this M characteristic vector is at R from described set of matrices
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer; Described base station, for according to described index I at R
mcorresponding vector R is found in code book
i m, and according to described function F (P
n, R
i m) and described quantitative information P
nknow the quantitative information of N+1 to N+M characteristic vector.
In order to solve the problems of the technologies described above, present invention also offers a kind of mobile terminal of transmitting channel information, described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) calculate and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector, and determines that this M characteristic vector is at R from described set of matrices
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer.
The present invention, compared to prior art, can effectively reduce codeword selection computation complexity, and improve quantified precision, the method for transmitting channel information provides a kind of new implementation.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method one of transmitting channel information in embodiment;
Fig. 2 is the flow chart of the method two of transmitting channel information in embodiment.
Embodiment
As shown in Figure 1, the method for transmitting channel information comprises the following steps:
Step 101: according to pilot tone, mobile terminal (UE) estimates that channel obtains channel information.
Step 102:UE determines N number of (N is for being more than or equal to 1) the integer characteristic vector in characteristic vectors whole in channel information, and determines the quantitative information P of this N number of characteristic vector
n.
N number of characteristic vector that UE determines can be by top n or rear N number of characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in whole characteristic vector, namely can be maximum N number of characteristic value characteristic of correspondence vector, also can be minimum N number of characteristic value characteristic of correspondence vector.
UE determines the quantitative information P of this N number of characteristic vector
nmethod can be code book feedback quantization method or any one quantization method in LTE, such as use code book feedback quantization method in LTE to comprise following content: UE is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to base station; Base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
Step 103:UE according to the R1 code book (order is the code book of 1) of K bit to P
nbe treaty rule function F (P
n, R
1) process, calculate 2
kindividual and P
northogonal set of vectors Γ, and and R
1each codewords indexes one_to_one corresponding in code book.
Described treaty rule can be orthogonalization process rule.
The channel characteristics vector that mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0.When N number of characteristic vector of feedback is maximum N number of or minimum N number of characteristic value characteristic of correspondence vector, K is less than or equal to feedback P
nrequired expense and the ratio of N.
Step 104:UE determines the quantitative information of a vector as any one characteristic vector outside the N number of characteristic vector quantized in step 102 from set of vectors Γ, and determines that this vector is at R
1index I corresponding in code book.
Step 105:UE is by quantitative information P
nbase station is sent to index I.
Step 106: base station according in step 105 feedback index I at R
1the corresponding vector R found in code book
i 1, regular F (P according to a preconcerted arrangement
n, R
i 1), in conjunction with P
ninformation, obtain the quantitative information of N+1 vector.
In other implementation, in a step 102, UE determines the quantitative information P of N number of characteristic vector
ntime, except using in prior art except feedback quantization method, the quantization method that can also describe in nested use step 103 of the present invention and step 104.Such as, when the value of N is 5, determine the quantitative information of the 1st characteristic vector according to existing codebook quantification method after, the quantitative information of the 2nd characteristic vector is determined according to the mode of step 103 and step 104 in the quantitative information of the 1st characteristic vector and the present invention, according to the 1st, in the quantitative information of 2 characteristic vectors and the present invention, the mode of step 103 and step 104 determines the quantitative information of the 3rd characteristic vector, according to the 1st, 2, in the quantitative information of 3 characteristic vectors and the present invention, the mode of step 103 and step 104 determines the quantitative information of the 4th characteristic vector, the like.Concrete implementation is with reference to specific embodiment.
As shown in Figure 2, the method for another kind of transmitting channel information comprises the following steps:
Step 201: according to pilot tone, mobile terminal (UE) estimates that channel obtains channel information.
Step 202:UE determines N number of (N is for being more than or equal to 1) the integer characteristic vector in characteristic vectors whole in channel information, and determines the quantitative information P of this N number of characteristic vector
n.
N number of characteristic vector that UE determines can be by top n or rear N number of characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in whole characteristic vector, namely can be maximum N number of characteristic value characteristic of correspondence vector, also can be minimum N number of characteristic value characteristic of correspondence vector.
UE determines the quantitative information P of this N number of characteristic vector
nmethod can be code book feedback quantization method or any one quantization method in LTE, such as use code book feedback quantization method in LTE to comprise following content: UE is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to base station; Base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
Step 203:UE uses the R of K bit
mcode book (order is the code book of M) to P
nbe treaty rule function F (P
n, R
m) process, M be greater than 1 positive integer, calculate 2
kindividual and P
northogonal set of matrices Γ, and and R
meach codewords indexes one_to_one corresponding in code book.
Described treaty rule can be orthogonalization process rule.
The channel characteristics vector that mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0.When N number of characteristic vector of feedback is maximum N number of or minimum N number of characteristic value characteristic of correspondence vector, the average feedback expense (i.e. K/M) of each characteristic vector is less than or equal to feeds back P
nrequired expense and the ratio of N.
Step 204:UE determines that from set of vectors Γ a matrix is as the quantitative information of appointing M characteristic vector outside the N number of characteristic vector quantized in step 202, and determines the index I that this M characteristic vector is corresponding in RM.
Step 205:UE is by quantitative information P
nbase station is sent to index I.
Step 206: base station is according to feeding back index I at R from step 205
mcorresponding vector R is found in code book
i m, rule function F (P according to a preconcerted arrangement
n, R
i m), in conjunction with P
ninformation, obtain the quantitative information of N+1 to N+M characteristic vector.
In other implementation, in step 202., UE determines the quantitative information P of N number of characteristic vector
ntime, except using in prior art except feedback quantization method, the quantization method that can also describe in nested use step 203 of the present invention and step 204.Such as, when the value of N is 5, determine the quantitative information of the 1st characteristic vector according to existing codebook quantification method after, determine the quantitative information of the 2nd, 3 characteristic vector according to the mode of step 203 and step 204 in the quantitative information of the 1st characteristic vector and the present invention, determine the quantitative information of the 4th, 5 characteristic vector according to the mode of step 203 and step 204 in the quantitative information of the 1st, 2,3 characteristic vector and the present invention.Concrete implementation is with reference to specific embodiment.
Specific embodiment 1
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, can from a R
ncode book in find and quantize the code word of this N number of characteristic vector.
More specifically, this code book can the R of 4Tx or 8Tx in LTE standard and LTE-A standard
ncode book.
As N be 1 time, UE is from R
1select the quantification of a code word as one of them characteristic vector in code book, this characteristic vector can be, but not limited to be eigenvalue of maximum characteristic of correspondence vector.Its quantization index is j.According to the same codebook that sending and receiving end stores, the concrete corresponding vector of j can be found, thus find the quantization vector R of eigenvalue of maximum character pair vector
j 1.
If UE needs altogether feedback 3 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of vectors Γ.And from Γ, choose the quantitative information of a vector as the 2nd characteristic vector, this characteristic vector can be the 2nd large characteristic value characteristic of correspondence vector, and records its index k.
UE can obtain the quantification of 2 characteristic vectors
the vector Γ corresponding with index k
k, and form a matrix
uE utilizes function
can obtain with
the set Ψ of orthogonal multiple vectors, chooses a quantification as the 3rd characteristic vector from Ψ, and this characteristic vector can be the 3rd large characteristic value characteristic of correspondence vector, and records its index i.
UE feeds back index j, k, i, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains according to index k
and utilize the rule of agreement
obtain the quantification Γ of the 2nd characteristic vector
k, base station obtains according to index i
and utilize the rule of agreement
obtain the quantitative information of the 3rd characteristic vector.
Specific embodiment 2
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, can from a R
ncode book in find and quantize the code word of this N number of characteristic vector.
More specifically, this code book can be the code book of the RankN of 4Tx or 8Tx in LTE standard and LTE-A standard
As N be 1 time, UE is from R
1code book selects the quantification of a code word as one of them characteristic vector, and this characteristic vector can be, but not limited to be eigenvalue of maximum characteristic of correspondence vector.Its quantization index is j.According to the same codebook that sending and receiving end stores, the concrete corresponding vector of j can be found, thus find the quantization vector of eigenvalue of maximum character pair vector
If UE needs altogether feedback 3 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of matrices Γ.Wherein
be a R
2code book, as the R specified in LTE/LTE-A
2code book.And from Γ, choose the quantitative information of a matrix as other 2 characteristic vectors, and record its index k.
The matrix that this index k is corresponding comprises two orthogonal vectors can distinguish corresponding two characteristic vectors.
UE feeds back j, k, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains according to index k
and utilize the rule of agreement
obtain the quantification Γ of other 2 characteristic vectors
k.
Specific embodiment 3
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, the code word quantizing this N number of characteristic vector can be found from the code book of a Rank N.
More specifically, this code book can be the code book of the RankN of 4Tx or 8Tx in LTE standard and LTE-A standard
As N be 1 time, UE is from R
1code book selects the quantification of a code word as one of them characteristic vector, and this characteristic vector can be, but not limited to be eigenvalue of maximum characteristic of correspondence vector.Its quantization index is j.According to the same codebook that sending and receiving end stores, the concrete corresponding vector of j can be found, thus find the quantization vector of eigenvalue of maximum character pair vector
If UE needs altogether feedback 4 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of vectors Γ, and from Γ, choose the quantification of a vector as the 2nd characteristic vector, this characteristic vector can be the 2nd large characteristic value characteristic of correspondence vector.And record its index k.
UE can obtain the quantification of 2 characteristic vectors
with Γ k, and form a matrix
uE utilizes function
can obtain with
the set Ψ of orthogonal multiple matrixes, wherein
be a R
2code book, as the R specified in LTE/LTE-A
2code book, chooses a quantification as the 3rd, 4 characteristic vector, and records its index i from Ψ.
UE feeds back j, k, i, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains according to index k
and utilize the rule of agreement
obtain the quantification Γ of the 2nd characteristic vector
k, base station obtains according to index i
and utilize the rule of agreement
obtain the 3rd, the quantification of 4 characteristic vectors.
Specific embodiment 4
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, the code word quantizing this N number of characteristic vector can be found from the code book of a Rank N.
As N be 2 time, UE is from Rank2 code book
select the quantitative information of a code word as wherein two characteristic vectors, this characteristic vector can be, but not limited to be 2 maximum characteristic value characteristic of correspondence vectors.
be a Rank2 code book, as the Grassmannian code book of 12bit.Its quantization index is j.According to the same codebook that sending and receiving end stores, the concrete corresponding vector of j can be found, thus find the quantization vector of two maximum characteristic value character pair vectors
If UE needs altogether feedback 4 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of vectors Γ.Wherein
be a 6bit Rank1 code book, as R in table 5
1code book, and from Γ, choose the quantification of a vector as the 3rd characteristic vector, this characteristic vector can be the 3rd large characteristic value characteristic of correspondence vector, and records its index k.
Table 5:
0 0.5000 -0.5000 0.5000 -0.5000
1 -0.5000 -0.5000 0.5000 0.5000
2 -0.5000 0.5000 0.5000 -0.5000
3 0.5000 -0.5000i 0.5000 -0.5000i
4 -0.5000 -0.5000i 0.5000 0.5000i
5 -0.5000 0.5000i 0.5000 -0.5000i
6 0.5000 0.5000 0.5000 0.5000
7 0.5000 0.5000i 0.5000 0.5000i
8 0.5000 0.5000 0.5000 -0.5000
9 0.5000 0.5000i -0.5000 0.5000i
10 0.5000 -0.5000 0.5000 0.5000
11 0.5000 -0.5000i -0.5000 -0.5000i
12 0.5000 0.3536+0.3536i 0.5000i -0.3536+0.3536i
13 0.5000 -0.3536+0.3536i -0.5000i 0.3536+0.3536i
14 0.5000 -0.3536-0.3536i 0.5000i 0.3536-0.3536i
15 0.5000 0.3536-0.3536i -0.5000i -0.3536-0.3536i
16 0.5000 -0.4619-0.1913i 0.3536+0.3536i -0.1913-0.4619i
17 0.3117 0.6025+0.1995i -0.4030-0.4903i -0.1122-0.2908i
18 0.3117 -0.6025-0.1995i -0.1122-0.2908i 0.4030+0.4903i
19 0.3058 0.1901-0.6052i 0.1195+0.2866i 0.4884-0.4111i
20 0.5000 -0.1913+0.4619i -0.3536-0.3536i 0.4619-0.1913i
21 0.5000 0.1913-0.4619i -0.3536-0.3536i -0.4619+0.1913i
22 0.5000 0.4619+0.1913i 0.3536+0.3536i 0.1913+0.4619i
23 0.3082 0.0104+0.3151i 0.4077+0.4887i -0.4783+0.4145i
24 0.3117 0.3573-0.2452i 0.6025-0.1995i -0.1578+0.5360i
25 0.3117 0.2452+0.3573i -0.6025+0.1995i 0.5360+0.1578i
26 0.3082 -0.3666+0.2426i 0.6092-0.1842i 0.1615-0.5298i
27 0.3117 -0.2452-0.3573i -0.6025+0.1995i -0.5360-0.1578i
28 0.3117 0.4260+0.0793i 0.1995+0.6025i 0.2674+0.4906i
29 0.3117 -0.0793+0.4260i -0.1995-0.6025i 0.4906-0.2674i
30 0.3117 -0.4260-0.0793i 0.1995+0.6025i -0.2674-0.4906i
31 0.3117 0.0793-0.4260i -0.1995-0.6025i -0.4906+2674i
UE can obtain the quantification of 3 characteristic vectors
and Γ
k, and form a matrix
uE utilizes function
with Rank1 code book ζ
1, can obtain with
the set Ψ of orthogonal multiple vectors, wherein ζ
1be a Rank1 code book, as 4bit LTE/LTE-A Rank1 code book.From Ψ, choose a quantification as the 4th characteristic vector, and record its index i.
In this embodiment, the quantification of the 3rd vector is 6bit, and the quantification of the 4th vector is 4bit, and be different according to the characteristic value of characteristic vector, its significance level is different, and quantified precision is different.
And the 1st, the average quantization precision (6+4)/2 of large 3,4 characteristic vectors later of average quantization precision 12/2 of 2 vectors, with above in like manner.
UE feeds back j, k, i, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains according to index k
and utilize the rule of agreement
obtain the quantification Γ of the 2nd characteristic vector
k, base station obtains according to index i
and utilize the rule of agreement
obtain the quantification of the 4th characteristic vector.
Specific embodiment 5
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, the code word quantizing this N number of characteristic vector can be found from the code book of a Rank N.
As N be 1 time, UE is from a 8bit R
1code book selects the quantification of a code word as one of them characteristic vector, and this characteristic vector can be, but not limited to be the minimal eigenvalue characteristic of correspondence vector comprising 0 characteristic value.Its quantization index is j.Base station, according to the same codebook stored, can be found the concrete corresponding vector of j, thus find the quantization vector of eigenvalue of maximum character pair vector
If UE needs altogether feedback 2 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of vectors
ζ
1it is a 6bitRank1 code book.And from Γ
in choose the quantification of a vector as the 2nd characteristic vector, this characteristic vector can be the 2nd large characteristic value characteristic of correspondence vector.And record its index k.
UE feeds back j, k, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains ζ according to index k
1 k, and utilize the rule of agreement
obtain the quantification Γ of the 2nd characteristic vector
k.
Specific embodiment 6
The pilot tone that UE can issue according to base station, measures and estimates channel information more accurately.
First UE can obtain the quantification of wherein N number of characteristic vector according to the channel information obtained.
Concrete, the code word quantizing this N number of characteristic vector can be found from the code book of a Rank N.
As N be 1 time, UE is from a 8bit Rank1 code book
select the quantification of a code word as one of them characteristic vector, this characteristic vector can be, but not limited to be the minimal eigenvalue characteristic of correspondence vector comprising 0 characteristic value.Its quantization index is j.According to the same codebook that sending and receiving end stores, the concrete corresponding vector of j can be found, thus find the quantization vector of eigenvalue of maximum character pair vector
If UE needs altogether feedback 3 characteristic vectors, can be, but not limited to feed back with following methods:
UE utilizes function
obtain with
orthogonal multiple set of matrices Γ, ζ
2be a 8bit R
2code book.And from Γ, choose the quantification of a matrix as the 2nd, 3 characteristic vector, this characteristic vector can for comprising little and the 3rd little characteristic value characteristic of correspondence vector of 0 characteristic value the 2nd.And record its index k.
UE feeds back j, k, base station according to index j from
obtain the quantification of the 1st characteristic vector
base station obtains ζ according to index k
2, and utilize the rule of agreement
obtain the 2nd, the quantification Γ of 3 characteristic vectors
k.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a method for transmitting channel information, is characterized in that,
Mobile terminal determines the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) to P
nbe treaty rule function F (P
n, R
1) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule; Described mobile terminal determines that from described set of vectors a vector and this vector are at R
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer;
Described base station according to described index I at R
1corresponding vector R is found in code book
i 1, and according to described function F (P
n, R
i 1) and described quantitative information P
nknow the quantitative information of N+1 characteristic vector.
2. the method for claim 1, is characterized in that,
Described base station knows that the concrete grammar of the quantitative information of top n characteristic vector comprises:
Described mobile terminal is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to described base station; Described base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
3. method as claimed in claim 1 or 2, is characterized in that,
Described N number of channel characteristics vector is by top n characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
1the bit number that code book is corresponding is that the value of K, K is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
4. method as claimed in claim 1 or 2, is characterized in that,
The channel characteristics vector that described mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0, described N number of channel characteristics vector is by N number of characteristic value characteristic of correspondence vector after in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
1the bit number that code book is corresponding is that the value of K, K is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
5. a system for transmitting channel information, comprises mobile terminal and base station, it is characterized in that,
Described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) to P
nbe treaty rule function F (P
n, R
1) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule, determines that a vector and this vector are at R from described set of vectors
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer;
Described base station, for according to described index I at R
1corresponding vector R is found in code book
i 1, and according to described function F (P
n, R
i 1) and described quantitative information P
nknow the quantitative information of N+1 characteristic vector.
6. a mobile terminal for transmitting channel information, is characterized in that,
Described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of 1 according to order
1and function F (P
n, R
1) to P
nbe treaty rule function F (P
n, R
1) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
1the set of vectors that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule, determines that a vector and this vector are at R from described set of vectors
1index I corresponding in code book, by described quantitative information P
nbase station is sent to described index I; Wherein N be more than or equal to 1 integer.
7. a method for transmitting channel information, is characterized in that,
Mobile terminal determines the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) to P
nbe treaty rule function F (P
n, R
m) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule; Described mobile terminal determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector from described set of matrices, and determines that this M characteristic vector is at R
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer;
Described base station according to described index I at R
mcorresponding vector R is found in code book
i m, and according to described function F (P
n, R
i m) and described quantitative information P
nknow the quantitative information of N+1 to N+M characteristic vector.
8. method as claimed in claim 7, is characterized in that,
Described base station knows that the concrete grammar of the quantitative information of top n characteristic vector comprises:
Described mobile terminal is code book and the R of N from order
nin select the quantitative information P of a code word as N number of characteristic vector
n, determine its quantization index j, and notice is to described base station; Described base station according to described quantization index j from R
nfind corresponding vector in code book, thus know the quantitative information of top n characteristic vector.
9. method as claimed in claim 7 or 8, is characterized in that,
Described N number of channel characteristics vector is by top n characteristic value characteristic of correspondence vector in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
mthe bit number that code book is corresponding is K, and the average feedback expense of each characteristic vector is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
10. method as claimed in claim 7 or 8, is characterized in that,
The channel characteristics vector that described mobile terminal is known comprises the characteristic value characteristic of correspondence vector that value is 0, described N number of channel characteristics vector is by N number of characteristic value characteristic of correspondence vector after in the sequence of characteristic value size order in the channel characteristics vector known of described mobile terminal, R
mthe bit number that code book is corresponding is K, and the average feedback expense of each characteristic vector is less than or equal to mobile terminal and feeds back described quantitative information P
nrequired expense and the ratio of N.
The system of 11. 1 kinds of transmitting channel informations, comprises mobile terminal and base station, it is characterized in that,
Described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) to P
nbe treaty rule function F (P
n, R
m) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule, determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector, and determine that this M characteristic vector is at R from described set of matrices
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer;
Described base station, for according to described index I at R
mcorresponding vector R is found in code book
i m, and according to described function F (P
n, R
i m) and described quantitative information P
nknow the quantitative information of N+1 to N+M characteristic vector.
The mobile terminal of 12. 1 kinds of transmitting channel informations, is characterized in that,
Described mobile terminal, for determining the quantitative information P of N number of channel characteristics vector
n, and be code book and the R of M according to order
mand function F (P
n, R
m) to P
nbe treaty rule function F (P
n, R
m) process, calculate 2
kindividual and described quantitative information P
northogonal and with described R
mthe set of matrices that the code word of code book is corresponding, described treaty rule can be orthogonalization process rule, determines the quantitative information of a matrix as M characteristic vector outside described N number of characteristic vector, and determine that this M characteristic vector is at R from described set of matrices
mthe index I of middle correspondence, by described quantitative information P
nbe sent to base station with described index I, wherein N be more than or equal to 1 integer, M be greater than 1 integer.
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| CN101924612B (en) * | 2010-08-27 | 2012-11-21 | 北京航空航天大学 | Method for generating codebooks under relevant channels in wireless communication system |
| CN102164019B (en) * | 2010-12-31 | 2013-04-17 | 华为技术有限公司 | Channel state information compression method and device |
| CN105515725B (en) * | 2014-09-26 | 2020-07-07 | 中兴通讯股份有限公司 | Pilot frequency sending method, channel information measurement feedback method, sending end and receiving end |
| CN107431576B (en) * | 2015-01-20 | 2020-06-16 | 华为技术有限公司 | Method and device for obtaining precoding information |
| CN107395256B (en) | 2016-05-12 | 2021-02-09 | 华为技术有限公司 | Channel state information feedback method, device and system |
| CN109802734B (en) * | 2017-11-17 | 2020-10-23 | 华为技术有限公司 | A method and apparatus for transmitting channel quality information |
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| CN101540746B (en) * | 2008-03-20 | 2013-06-05 | 电信科学技术研究院 | Method and device for quantizing time and frequency channel and corresponding mobile communication terminal and corresponding mobile communication system |
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