Precoding matrix construction method for 3DMU-MIMO

Abstract

The invention relates to the technical field of the wireless communication, and in particular relates to a precoding matrix construction method for 3D MU-MIMO. The method comprises the following steps: constructing a first codebook matrix W1 with a precoding matrix W for representing the broadband or long-term channel characteristic and a second codebook matrix W3 for the first codebook matrix W1 broadband selection, and a second codebook matrix W2 product for representing the narrow-band or short-term channel characteristic, wherein the first codebook matrix is as shown in description. Through the method disclosed by the invention, the degree of freedom of a vertical direction of an active antenna system can be sufficiently used by using the precoding matrix supporting the quantization on each of the vertical direction and the horizontal direction, the problems about the CSI feedback precision and the system throughput of the 4G LTE, LTE-A and 5G IMT-2020 mobile communication system eMBB are solved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for constructing a 3D MU-MIMO precoding matrix. Background technique [0002] The implementation of Multiple-Input Multiple-Output (MIMO) technology will rely on the use of channel state information (CSI). In order to improve system transmission performance by precoding at the sender, the sender needs to know the channel state Information (Channel Statement Information, CSI), and the channel state information CSI is usually obtained by the receiver using the reference sequence for channel estimation, which usually requires the receiver to feed back the channel state information CSI to the sender for calculating the appropriate The precoding or beamforming parameters of . However, the limitation of the CSI feedback channel determines that the design of the precoding codebook is necessary. In order to reduce the amount of feedback, a two-layer dual...

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Problems solved by technology

However, most of the current dual codebooks are designed for linear antenna array layouts, so for planar antenna array layouts, these dual codebooks cannot describe the long-term statistical characteristics of the channel well, thus affecting the system precoding performance. have a greater impact

[0004] Although a precoding scheme based on dual codebooks is proposed in the prior art, for example, the existing LTE R8 system is based on a 4-antenna codebook designed based on mirror transformation Householder and the LTE R10 system is based on an 8-antenna codebook designed based on a dual codebook. It is mainly designed for the horizontal antenna, without considering the degree of freedom of the vertical antenna, and the degree of freedom of space resources is not fully utilized, especially the space resources in the vertical domain are not fully utilized, so when multiple users are distributed in the same building In the case of different floors of the building, these solutions are difficult to support multi-user transmission, and when they are directly used for AAS base station antenna deployment, the system performance will be severely degraded

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