CN104980198B - A kind of double method for generating codebooks for mimo system - Google Patents
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Abstract
The present invention proposes that a kind of double method for generating codebooks for mimo system, this method are：Each antenna port is fair to traverse all antenna port phase difference situations, each channel characteristics when for traversal all generate a pre-coding matrix for reflecting the channel characteristics, form second level code book.The dicode sheet that mimo system can quickly, conveniently, be accurately generated using the present invention, especially suitable for high order situation.
Description
Technical field
The present invention relates in wireless communication technology field multiple-input and multiple-output (MIMO) technology more particularly to one kind be used for
Double method for generating codebooks of mimo system.
Background technology
Entitled《A kind of method and system using dicode this progress feedback of channel information》, application No. is
201010289774.2 Chinese invention patent application in, it is proposed that a kind of side using dicode this progress feedback of channel information
Method：Receiving side signal selects a first best code word from the code book of the pre-coding matrix of the prior art, and according to capacity
Maximization standard selects an optimal code word of two level from pre-set second level code book, then sends out corresponding codewords indexes
It send to signalling, signalling inquires pre-set first order code book and second according to the codewords indexes received
Grade code book obtains the optimal code word of corresponding first best code word and the second level, and it is first best code word to ultimately produce pre-coding matrix
With the product of the optimal code word in the second level.After the patent application uses second level code book, can originally it be more accurately reflected than solid size
Actual channel condition.
The patent application further discloses the generation method of second level code book, i.e., is spin matrix by second level codebook design
Form, so that channel capacity reaches the upper limit.However, this be only applicable in the method that second level codebook design is spin matrix
The situation for being 1~3 in order is more than order 3 situation, it is clear that can not design second level code book by spin matrix.Therefore,
A kind of double method for generating codebooks of the situation suitable for order more than 3 are also lacked at present.
Invention content
For overcome the deficiencies in the prior art, the present invention proposes a kind of double method for generating codebooks for mimo system, should
Method is：Each antenna port is fair to traverse all antenna port phase difference situations, each when for traversal
Channel characteristics all generate a pre-coding matrix for reflecting the channel characteristics, form second level code book.
Preferably, the offset of the phase difference is limited in pi/2, further, deletes asymmetric phase difference
Situation and probability of occurrence are less than the phase difference situation of setting threshold value.
Preferably, when order is 4, second level code book is the set of pre-coding matrix composition shown in following table：
Preferably, when order is 8, second level code book is a unique pre-coding matrix：Unique pre-coding matrix
The pre-coding matrix that codewords indexes in the second level code book that preceding 4 row is 4 by above-mentioned order are 1,2,3,4,5,6,7,8 is parallel successively
Composition；Codewords indexes in the second level code book that rear 4 row of unique pre-coding matrix is 4 by above-mentioned order are 9,10,11,12,
13,14,15,16 pre-coding matrix forms parallel successively.
Preferably, when order be 5,6 or 7 when, second level code book be use cycle elimination method from above-mentioned order for 8 precoding square
The set that the pre-coding matrix that 5,6 or 7 rows generate is formed is chosen in battle array.
It is further preferred that when order is 5, second level code book is the set of pre-coding matrix composition shown in following table：
It is further preferred that when order is 6, second level code book is the set of pre-coding matrix composition shown in following table：
It is further preferred that when order is 7, second level code book is the set of pre-coding matrix composition shown in following table：
Preferably, when order is 5, second level code book is the set of pre-coding matrix composition shown in following table：
Preferably, in the above method, first order code book reuses the code book of the pre-coding matrix of the prior art.The existing skill
The code book of the pre-coding matrix of art can be code book specified in LTE R11 and previous version.It is further preferred that for 8 days
The mimo system of line, when order is 1~4, the pre-coding matrix of first order code book isWherein W4_4 is LTE R8 editions
Pre-coding matrix in the code book that this 4 antenna orders are 4.When order is 5, the pre-coding matrix of first order code book isWherein W4_4 is the pre-coding matrix in the code book that 4 antenna orders of LTE R8 versions are 4,
W4_1 is the pre-coding matrix in the code book that 4 antenna orders of LTE R8 versions are 1.
The dicode sheet that mimo system can quickly, conveniently, be accurately generated using the present invention, especially suitable for high order feelings
Shape.The present invention especially applies also for 3D mimo systems in addition to suitable for 2D mimo systems, when for 3D mimo systems, the
Two level code book can be reflected in the space division multiplexing of vertical dimensions so that 3D mimo channel capacity is greatly improved.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the chart of the second level code book of the embodiment of the present invention one；
Fig. 2 is the chart of the second level code book of the embodiment of the present invention two；
Fig. 3 is the selection schematic diagram of the cycle elimination method of the embodiment of the present invention four；
Fig. 4 is the selection schematic diagram of the cycle elimination method of the embodiment of the present invention five；
Fig. 5 is the selection schematic diagram of the cycle elimination method of the embodiment of the present invention six.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments；It should be noted that in the absence of conflict, in the application
Embodiment and embodiment in feature can be combined with each other.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Embodiment one：8 antenna MIMO systems, the design of code book when order is 4
For multiple-antenna MIMO system, first order code book can reuse the code book of the pre-coding matrix of the prior art.This reality
The mimo system for applying example uses 8 antennas, and when order is 1~4, it is 4 that first order version, which reuses 4 antenna orders in LTE R8 versions,
Code book, if set the pre-coding matrix that W4_4 is 4 as 4 antenna orders of LTE R8 versions, then the first order precoding of the present embodiment
Matrix is：
For second level code book, consider from fairness angle, all channels of all pre-coding matrixes reflection of code book are special
The set of sign should be：Each antenna port is fair to traverse all antenna port phase difference situations.Due in permanent mould item
Under part, the element of each pre-coding matrix illustrates the phase pushing figure of an antenna port, therefore each antenna port
All traverse all possible phase offset, and each channel characteristics when to traversal all generate one and reflect the channel characteristics
Pre-coding matrix, so that it may to form second level code book.However from realizing for upper, if traversed according to this ideal case all
Channel characteristics generate second level code book, and code book size can become excessively huge.Order is 4 in the present embodiment, then 4 antenna ports
The phase difference of (i.e. 4 data stream ports) shares following four situation：
(1) the four same phase in port
(2) only Single port is different from other ports
(3) two-port is identical and different two-by-two from remaining two-port
(4) two-port is different two-by-two
Each antenna port traverses above-mentioned 4 kinds of phase difference situations, then shared 1+4 × 3+4 × 3 × 3+4 × 3 ×
2=73 kind channel characteristics, if generating two level code book by this 73 kinds of channel characteristics, it is clear that code book size will be excessive.It moves back and asks
Secondly, the present embodiment constructs code book while reflection channel characteristics comprehensively as far as possible with pre-coding matrix as few as possible.
In view of the phase offset for reaching receiving terminal due to each antenna port caused by multipath fading in realistic channels environment is smaller, institute
The phase pushing figure in pre-coding matrix is limited within pi/2 with the present embodiment, thus only 1+4 × 2+4 × 3=21 kinds
Channel characteristics, and then have compressed code book size.Consider further that realistic channels environment, the same phase in four ports and only Single port and other termination
The different phase difference situation of mouth is less, and probability of occurrence is less than preset threshold value 10%, then further removes four ports
With four kinds of channel characteristics for mutually shifting to an earlier date pi/2 with Single port, remaining 16 kinds of channel characteristics are pre- to 16 kinds of channel characteristics generations 16
Encoder matrix, forms second level code book, and specific second level version is the set of pre-coding matrix shown in FIG. 1 composition.
Embodiment two：8 antenna MIMO systems, the design of code book when order is 5
It is 1 that the first order code book of the present embodiment, which reuses the code book that 4 antenna orders in LTE R8 versions are 4 and 4 antenna orders,
Code book is designed asWherein W4_4 is the code book that 4 antenna orders of LTE R8 versions are 4
In pre-coding matrix, W4_1 is the pre-coding matrix in the code book that 4 antenna orders of LTE R8 versions are 1.
The second level code book of the present embodiment according to embodiment one same design thinking, the phase in pre-coding matrix is inclined
Shifting amount is limited within pi/2, and according to coupling, removing asymmetric phase difference situation, i.e. five ports mutual not phase two-by-two
With and three ports mutual different phase difference situation two-by-two, be left following three kinds of situations, i.e.,：
(1) the five same phase in port
(2) only Single port is different from other
(3) two-port is identical and different two-by-two from its excess-three port
After limitation, remaining 1+5+10=16 kinds channel characteristics, then the pre-coding matrix number of second level code book is 16,
Specific second level version is the set of pre-coding matrix shown in Fig. 2 composition.
Embodiment three：Multiple-antenna MIMO system, the design of second level code book when order is 8
When order is 8 in multiple-antenna MIMO system, mentality of designing is identical when mentality of designing and the order of embodiment one are 4, i.e., often
One antenna port is all fair to traverse all antenna port phase difference situations.The present embodiment reuses the second level of embodiment one
Code book w2_R4 uses the combination for the weight vectors for ensureing port fairness as the column vector in pre-coding matrix, and it is 8 to generate order
Second level code book, the code book be a unique pre-coding matrix w2_R8, it is specific as follows：
W2_R8=[w2_R4 (:,:,1)w2_R4(:,:,2)w2_R4(:,:,3)w2_R4(:,:,4)w2_R4(:,:,5)
w2_R4(:,:,6)w2_R4(:,:,7)w2_R4(:,:,8)；
w2_R4(:,:,9)w2_R4(:,:,10)w2_R4(:,:,11)w2_R4(:,:,12)w2_R4(:,:,13)w2_R4
(:,:,14)w2_R4(:,:,15)w2_R4(:,:,16)]
Codewords indexes in the two level code book that preceding 4 row of above-mentioned unique pre-coding matrix is 4 by order are 1,2,3,4,5,6,
7,8 pre-coding matrix forms parallel successively；Codewords indexes in the two level code book that 4 rows are 4 by order afterwards are 9,10,11,12,
13,14,15,16 pre-coding matrix forms parallel successively.
Example IV：Multiple-antenna MIMO system, the design of second level code book when order is 5
When order is 5, the method that embodiment two may be used generates second level code book, can also use the side of the present embodiment
Method chooses 5 rows as pre-coding matrix from the pre-coding matrix that the order of embodiment three is 8.Collateral security fairness angle one kind is excellent
Following the example of for choosing is cycle elimination method as shown in Figure 3, first pre-coding matrix take that order is 8 pre-coding matrix the [4,5,
6,7,8] row composition, second pre-coding matrix take [6,7,8,1,2] row, third pre-coding matrix take the [8,1,2,3,
4] row, the 4th pre-coding matrix take [2,3,4,5,6] row, i.e. second level code book specific as follows：
W2_R5(:,:, 1)=[W2_R8 (4,；)W2_R8(5,；)W2_R8(6,；)W2_R8(7,；)W2_R8(8,；)]
W2_R5(:,:, 2)=[W2_R8 (6,；)W2_R8(7,；)W2_R8(8,；)W2_R8(1,；)W2_R8(2,；)]
W2_R5(:,:, 3)=[W2_R8 (8,；)W2_R8(1,；)W2_R8(2,；)W2_R8(3,；)W2_R8(4,；)]
W2_R5(:,:, 4)=[W2_R8 (2,；)W2_R8(3,；)W2_R8(4,；)W2_R8(5,；)W2_R8(6,；)]
Embodiment five：Multiple-antenna MIMO system, the design of second level code book when order is 6
The present embodiment order is 6, and second level codebook design thinking is identical as the thinking of example IV, and the order from embodiment three is
6 rows are chosen in 8 pre-coding matrix as pre-coding matrix.Equally, collateral security fairness angle one kind preferably follow the example of be as
Cycle elimination method shown in Fig. 4, it is [3,4,5,6,7,8] row group of 8 pre-coding matrix that first pre-coding matrix, which takes order,
At, second pre-coding matrix takes [5,6,7,8,1,2] row, third pre-coding matrix to take [7,8,1,2,3,4] row, the
Four pre-coding matrixes take [1,2,3,4,5,6] row, i.e. second level code book specific as follows：
W2_R6(:,:, 1)=[W2_R8 (3,；)W2_R8(4,；)W2_R8(5,；)W2_R8(6,；)W2_R8(7,；)W2_
R8(8,；)]
W2_R6(:,:, 2)=[W2_R8 (5,；)W2_R8(6,；)W2_R8(7,；)W2_R8(8,；)W2_R8(1,；)W2_
R8(2,；)]
W2_R6(:,:, 3)=[W2_R8 (7,；)W2_R8(8,；)W2_R8(1,；)W2_R8(2,；)W2_R8(3,；)W2_
R8(4,；)]
W2_R6(:,:, 4)=[W2_R8 (1,；)W2_R8(2,；)W2_R8(3,；)W2_R8(4,；)W2_R8(5,；)W2_
R8(6,；)]
Embodiment six：Multiple-antenna MIMO system, the design of second level code book when order is 7
The present embodiment order is 7, and second level codebook design thinking is identical as the thinking of example IV, and the order from embodiment three is
7 rows are chosen in 8 pre-coding matrix as pre-coding matrix.Equally, collateral security fairness angle one kind preferably follow the example of be as
Cycle elimination method shown in fig. 5, first pre-coding matrix take [2,3,4,5,6,7,8] row that order is 8 pre-coding matrix
Composition, second pre-coding matrix take [1,2,4,5,6,7,8] row, third pre-coding matrix take the [1,2,3,4,6,7,
8] row, the 4th pre-coding matrix take [1,2,3,4,5,6,8] row, i.e. second level code book specific as follows：
W2_R7(:,:, 1)=[W2_R8 (2,；)W2_R8(3,；)W2_R8(4,；)W2_R8(5,；)W2_R8(6,；)W2_
R8(7,；)W2_R8(8,；)]
W2_R7(:,:, 2)=[W2_R8 (1,；)W2_R8(2,；)W2_R8(4,；)W2_R8(5,；)W2_R8(6,；)W2_
R8(7,；)W2_R8(8,；)]
W2_R7(:,:, 3)=[W2_R8 (1,；)W2_R8(2,；)W2_R8(3,；)W2_R8(4,；)W2_R8(6,；)W2_
R8(7,；)W2_R8(8,；)]
W2_R7(:,:, 4)=[W2_R8 (1,；)W2_R8(2,；)W2_R8(3,；)W2_R8(4,；)W2_R8(5,；)W2_
R8(6,；)W2_R8(8,；)].
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer read/write memory medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or light
The various media that can store program code such as disk.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (11)
1. a kind of double method for generating codebooks for mimo system, which is characterized in that the method is：
Each antenna port is fair to traverse all antenna port phase difference situations, each channel when for traversal
Feature all generates a pre-coding matrix for reflecting the channel characteristics, forms second level code book；
When order is 4, second level code book is the set of pre-coding matrix composition shown in following table：
The offset of the phase difference is limited within pi/2, and the phase difference situation deletes asymmetric phase difference feelings
Shape and probability of occurrence are less than the phase difference situation of setting threshold value.
2. according to the method described in claim 1, it is characterized in that：When order is 8, second level code book is one and uniquely prelists
Code matrix：Codewords indexes in the second level code book that preceding 4 row of unique pre-coding matrix is 4 by order are 1,2,3,4,5,6,7,
8 pre-coding matrix forms parallel successively；Code word in the second level code book that rear 4 row of unique pre-coding matrix is 4 by order
Index forms parallel successively for 9,10,11,12,13,14,15,16 pre-coding matrix.
3. according to the method described in claim 2, it is characterized in that：When order is 5,6 or 7, second level code book is using cycle
The set that the pre-coding matrix that 5,6 or 7 rows generate forms is chosen in pre-coding matrix of the elimination method from order by 8.
4. according to the method described in claim 2, it is characterized in that：When order is 5, second level code book is to prelist shown in following table
The set of code matrix composition：
5. according to the method described in claim 2, it is characterized in that：When order is 6, second level code book is to prelist shown in following table
The set of code matrix composition：
6. according to the method described in claim 2, it is characterized in that：When order is 7, second level code book is to prelist shown in following table
The set of code matrix composition：
7. according to the method described in claim 1, it is characterized in that：When order is 5, second level code book is to prelist shown in following table
The set of code matrix composition：
8. according to the method described in claim 1, it is characterized in that：First order code book reuses the pre-coding matrix of the prior art
Code book.
9. according to the method described in claim 8, it is characterized in that：The code book of the pre-coding matrix of the prior art is LTE
Code book specified in R11 and previous version.
10. according to the method described in claim 9, it is characterized in that：For the mimo system of 8 antennas, when order is 1~4, the
The pre-coding matrix of level-one code book isWherein W4_4 is prelisting in the code book that 4 antenna orders of LTE R8 versions are 4
Code matrix.
11. according to the method described in claim 9, it is characterized in that：For the mimo system of 8 antennas, when order is 5, first
Grade code book pre-coding matrix beWherein W4_4 is that 4 antenna orders of LTE R8 versions are 4
Pre-coding matrix in code book, W4_1 are the pre-coding matrix in the code book that 4 antenna orders of LTE R8 versions are 1.
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