Codebook generation method, precoding matrix determination method and related device
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A technology of precoding matrix and codebook, applied in the field of precoding matrix determination method and related device, and codebook generation method
Active Publication Date: 2017-05-03
DATANG MOBILE COMM EQUIP CO LTD
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However, there is currently no codebook design scheme for the case where the number of simultaneously transmitted data streams rank is greater than 1
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Embodiment 1
[0210] Embodiment 1: The process of using a two-dimensional orthogonal group to determine a precoding matrix is described below through a specific example.
[0211] Take rank equal to 8 as an example, based on figure 2 The two-dimensional orthogonal beam subgroup shown gives the following three design methods of the precoding matrix:
[0212] Suppose Y i '=Y i , and satisfy Y 1 =Y 2 , Y 3 =Y 4 , Y 5 =Y 6 , Y 7 =Y 8 , phase adjustment factor α 1 = α 3 = α 5 = α 7 = 1, α 2 = α 4 = α 6 = α 8 =-1. Four beam vectors need to be arbitrarily selected from the two-dimensional orthogonal beam subgroups, and the following three options are available
[0213] Option 1: Y 1 =X(:,1),Y 3 =X(:,2),Y 5 =X(:,3),Y 7 =X(:,4), such as Figure 5 As shown in , the shaded square is the selected beam vector;
[0214] Option two: Y 1 =X(:,1),Y 3 =X(:,3),Y 5 =X(:,5),Y 7 =X(:,7), such as Figure 6 As shown in , the shaded square is the selected beam vector;
[0215] Optio...
Embodiment 2
[0216] Embodiment 2: The process of using two two-dimensional orthogonal subgroups to determine a precoding matrix is described below through a specific example.
[0217] Take rank equal to 4 as an example, based on Figure 8 As shown, the first two-dimensional orthogonal beam subgroup adopts s 1 =0,s 2 = 0, expressed as
[0218]
[0219] define N p1 = 1, the second two-dimensional orthogonal beam subgroup uses s 1 = 1, s 2 = 0, expressed as
[0220]
[0221] The first-level codebook in the two-level codebook structure is: Among them, Z 1 =[X (0,0) x (1,0) ],Z 1 is a matrix with 16 columns.
[0222] For the second-level codebook selection adjustment factor α 1 = α 3 = 1, α 2 = α 4 =-1. A feasible way is to arbitrarily select two beam vectors from each two-dimensional orthogonal beam subgroup, and one implementation of the second-level codebook is:
[0223] Among them, e i is a unit vector of length 16 whose ith element is 1 and the rest are 0.
[...
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Abstract
The invention discloses a codebook generation method, a precoding matrix determination method and a related device, so as to provide a codebook design scheme for conditions in which the simultaneously-transmitted data stream number rank is larger than 1. The method comprises steps: first dimension beam vectors and second dimension beam vectors are grouped respectively to obtain multiple first dimension beam subgroups and multiple second dimension beam subgroups, wherein multiple beam vectors in the first dimension beam subgroups or the second dimension beam subgroups are mutually orthogonal; according to the Kronecker product between each first dimension beam subgroup and each second dimension beam subgroup, multiple two-dimension orthogonal beam subgroups are determined; according to the simultaneously-transmitted data stream number, a beam vector is selected from one or multiple two-dimension orthogonal beam subgroups, and according to the selected beam vector and the data stream number, a precoding matrix corresponding to the two-dimension orthogonal beam subgroup is generated; and a precoding matrix set corresponding to all or partial two-dimension orthogonal beam subgroups is determined to be the codebook corresponding to the data stream number.
Description
[0001] This application claims the priority of a Chinese patent application filed with the China Patent Office on October 21, 2015, entitled "Codebook Generation Method, Precoding Matrix Determination Method, and Related Devices", the entire contents of which are incorporated by reference in this application middle. technical field [0002] The present invention relates to the field of communication technology, in particular to a method for generating a codebook, a method for determining a precoding matrix and related devices. Background technique [0003] In a multi-antenna system, the transmitter can simultaneously transmit multiple data streams to the receiver, and the number of simultaneously transmitted data streams is called rank. For different ranks, different codebooks need to be designed. [0004] Currently, in a Long Term Evolution (LTE) system, a base station (eNB) is allowed to transmit up to 8 data streams at the same time, that is, the maximum value of rank is...
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