Pre-coding method for multi-user MIMO system

A precoding, multi-user technology, applied in the field of low-complexity precoding of multi-user MIMO systems, can solve the problem of high computational complexity
CN101984571AInactive Publication Date: 2011-03-09BEIJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF POSTS & TELECOMM
Publication Date
2011-03-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a pre-coding method for a multi-user MIMO (multi-input multi-output) system. The method comprises the following steps of: acquiring a channel matrix of each user of the system by feedback or TDD (time division duplex) system channel reciprocity; acquiring a channel pseudo-inverse matrix of each user of the system according to the least square error criterion; acquiring an orthogonal vector base matrix according to a channel pseudo-inverse sentence of each user of the system; acquiring a pre-coding merging matrix of each user of the system according to the channel matrixof each user of the system and the channel pseudo-inverse orthogonal vector base matrix by combining a max signal to leakage and noise ratio criterion; and acquiring a pre-coding matrix of each user of the system according to the orthogonal vector base matrix of each user of the system and the optimal merging matrix. The scheme can effectively reduce the calculation complexity of the scheme at the same time of keeping the performance of the original MSLNR (max signal to leakage and noise ratio) criterion scheme, the performance of the scheme is superior to that of the traditional diagonal scheme, and the scheme has lower calculation complexity and reduces the operating complexity of a base station.
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Description

technical field

[0001] The invention relates to the field of communication technology, in particular to a low-complexity precoding method for a multi-user MIMO system. Background technique

[0002] The multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology is a major breakthrough in the field of wireless mobile communication technology. MIMO technology refers to the use of multiple antennas for data transmission and reception. Studies have shown that using MIMO technology can increase the capacity of wireless communication systems. With the in-depth study of multi-antenna technology, MIMO technology has been extended from point-to-point single-user MIMO technology to point-to-multipoint multi-user MIMO system (Multiple User MIMO, MU-MIMO). In MU-MIMO technology, the multi-antenna diversity gain can effectively reduce the system bit error rate, and the multi-antenna multiplexing gain can expand the capacity area of ​​the multi-user system. MU-MIMO...

Claims

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