3DMU-MIMO precoding matrix construction method and apparatus

Abstract

The invention relates to the technical field of wireless communication, in particular to a 3D MU-MIMO precoding matrix construction method and apparatus. The 3D MU-MIMO precoding matrix construction method comprises the following steps: constructing a precoded matrix W as a first codebook matrix W1 indicating broadband or long-term channel characteristics, a second codebook matrix W3 for selecting a bandwidth of the first codebook matrix W1, and a product of the second codebook matrix W2 indicating narrowband or short-term channel characteristics, wherein the first codebook matrix is as follows: (shown in the description). The method and a corresponding device utilizes a precoding matrix supporting the quantification of a vertical direction and a horizontal direction, so that the freedom degree of the vertical direction of an active antenna system can be sufficiently utilized, and the problem CSI feedback precision and system throughput problem in 4G LTE, LTE-A and 5G IMT-2020 mobile communication system eMBB can be solved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for constructing a 3D MU-MIMO precoding matrix. Background technique [0002] In a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) system, a base station is usually provided with more than 128 base station antennas. At the same time, the base station is respectively connected to a plurality of radio access ports (Radio Access Port, RAP) through wired cables. Multiple radio frequency antennas are deployed. The base station transmitting end needs to perform precoding on the signal to be transmitted before using the base station antenna to transmit the signal. Precoding technology is a signal processing technology that the base station transmitter uses channel state information to preprocess the transmitted signal to improve the system capacity or reduce the bit error rate of the system. [0003] Generally, obtainin...

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Problems solved by technology

[0005] Although a precoding scheme based on dual codebooks has been 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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