Nonuniform segmentation-based vertical-dimension codebook design method under 3D MIMO channel
A 3D-MIMO and design method technology, which is applied in space transmit diversity, diversity/multi-antenna systems, radio transmission systems, etc., can solve the problem of Householder codebook performance that needs to be improved, codebook size is limited, and large-scale 3D cannot be well matched -MIMO channel and other issues
Active Publication Date: 2016-02-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
The unitary matrix codebook has better performance in strongly correlated channels, but the codebook size is limited; the ability of the Grassmann codebook to suppress interference is insufficient; the performance of the Householder codebook in correlated channels needs to be improved
However, these codebooks do not make full use of the characteristics of large-scale 3D-MIMO channels, and cannot better match large-scale 3D-MIMO channels. Therefore, under large-scale 3D-MIMO channels, the precoding codebook needs to be further optimized.
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[0036] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0037] figure 1 Schematic diagram of a large-scale 3D-MIMO channel model configured based on UPA:
[0038] Such as figure 1 As shown in (a), users are evenly distributed in a regular hexagonal cell with a radius of r, and the base station with a height of h is located at the center of the cell. Such as figure 1 As shown in (b), the base station configuration is N h ×N vThe two-dimensional UPA of the horizontal dimension and the vertical dimension antenna spacing is d h and d v . The signal sent by the end-array antenna of the base station reaches the user end through L paths through scattering, then the channel matrix of user k is:
[0039]
[0040] in is the random phase of the lth path of user k, uniformly distributed in the interval [0,2π], with denote the phase difference caused by the antenna spacing in the vertical an...
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The invention relates to a nonuniform segmentation-based vertical-dimension codebook design method under a 3D MIMO channel, and belongs to the technical field of wireless communication. In the method, first a base station uses a uniform planar array antenna to generate a large-scale 3D-MIMO channel; then G full-rank DFT unitary matrixes are generated according to a rotary DFT formula to form a horizontal-dimension codebook F(h); then vertical-dimension wave beam downward inclination angle probability distribution is calculated with information of base station height, cell radius and the like, a plurality of discrete wave beam angles are obtained based on nonuniform segmentation, corresponding codeword vectors are generated, and a vertical-dimension codebook F(v) is built; and finally the horizontal-dimension codebook and the vertical-dimension codebook are combined, a Kronecker product is utilized to build a 3D-MIMO-oriented precoding codebook. The nonuniform segmentation-based codebook scheme proposed by the invention can obtain relatively strong precoding gain and interference rejection capability, thereby improving overall performance of a system.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for designing a vertical dimension codebook based on non-uniform segmentation under a 3DMIMO channel. Background technique [0002] In recent years, with the widespread popularization of smart terminals such as mobile phones and tablets, mobile data traffic has shown explosive growth, and the existing wireless communication systems have gradually been unable to meet such huge business needs. Therefore, academia and industry have successively launched research on the fifth generation mobile communication technology (5 th Generation, 5G) research. The massive MIMO (Multiple Input Multiple Output, MIMO) technology is one of the candidate key technologies of 5G. Compared with the existing fourth-generation mobile communication technology (4 th Generation, 4G) technology, because it can significantly improve the spectrum efficiency and energy efficiency of the ...
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IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0465H04B7/0469H04B7/0478H04B7/0615H04B7/0626H04B7/0658
Inventor 景小荣曾友财张祖凡陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM