3D MU-MIMO-based precoding matrix construction method
A 3DMU-MIMO and precoding matrix technology, applied in the field of 3DMU-MIMO precoding matrix construction, can solve problems such as difficulty in supporting multi-user transmission, failure to consider the vertical antenna degree of freedom, and insufficient use of space resources
Inactive Publication Date: 2018-01-09
南京科兴新材料科技有限公司
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[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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[0023] The present invention will be further described below in conjunction with the examples, which are preferred embodiments of the present invention.
[0024] Providing a cross-polarized array with vertical and horizontal polarization at the transmitter tends to result in well-separated transmit channels, which is attractive for multi-stream MIMO transmission. Since the use of a block-diagonal structured precoding matrix matches the block-diagonal structure of the block-diagonal channel matrix, precoding with a block-diagonal structure is suitable. From this point of view, the commonly used + / - 45 degree cross-polarized arrays are likely not as good as using horizontal and horizontal Vertical polarization is then block-diagonal, which potentially increases inter-stream interference and thereby impairs MIMO performance, and is therefore considered unattractive. Thus, the block diagonal precoding matrix structure is not optimal for the + / - 45 degree cross-polarization case, ...
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The present invention relates to the field of wireless communication technology, and in particular to a method for constructing a precoding matrix based on 3D MU-MIMO, including: constructing a precoding matrix W to represent the first codebook matrix W1 representing broadband or long-term channel characteristics and used for the first codebook matrix W1 The second codebook matrix W3 of a codebook matrix W1 bandwidth selection, the second codebook matrix W2 product representing the narrowband or short-term channel characteristics, the first codebook matrix is: the method includes support for vertical and horizontal quantization The precoding matrix can make full use of the degree of freedom in the vertical direction of the active antenna system, and solve the problems of CSI feedback accuracy and system throughput in eMBB of 4G LTE, LTE‑A and 5G IMT‑2020 mobile communication systems.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for constructing a precoding matrix based on 3D MU-MIMO. 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, obtaining ...
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Inventor 杜凯铭
Owner 南京科兴新材料科技有限公司