Method and device for linear pre-coding in downlink multi-user MIMO (Multiple Input Multiple Output) system

A multi-user, precoding matrix technology, applied in diversity/multi-antenna system, wireless communication, space transmit diversity and other directions, can solve the problem of high computational complexity

Active Publication Date: 2012-04-18
NTT DOCOMO INC
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Problems solved by technology

The precoding algorithm based on dirty paper coding and iterative water-filling has very high computational complexity, so it still has great limitations in practical applications

Method used

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  • Method and device for linear pre-coding in downlink multi-user MIMO (Multiple Input Multiple Output) system
  • Method and device for linear pre-coding in downlink multi-user MIMO (Multiple Input Multiple Output) system
  • Method and device for linear pre-coding in downlink multi-user MIMO (Multiple Input Multiple Output) system

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Embodiment Construction

[0014] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to avoid confusing the understanding of the present invention.

[0015] Generally, the input-output relationship of a multi-user downlink MIMO system using linear precoding and decoding can be expressed by the following mathematical formula:

[0016] s ^ k = G k H k P 1 . . . P K s ...

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Abstract

The invention discloses a method and device for linear pre-coding in a downlink multi-user MIMO (Multiple Input Multiple Output) system. The method comprises the following steps of: obtaining a channel matrix of a downlink channel; carrying out linear operation on the channel matrix by using a zero-forcing principle or a minimum mean-square deviation principle to obtain a pre-coding matrix and a pre-decoding matrix, and repeating the step till convergence to obtain a converged pre-coding matrix; and initializing the speed and maximizing an iterative algorithm by using the converged pre-coding matrix. By using the method disclosed by the invention, the iterative algorithm can obtain speed and larger local optimal solution, thus the speed sum of the communication system is maximized and the speed and the performances of the system can be improved.

Description

technical field [0001] The invention relates to a linear precoding method for a downlink multi-user multiple-input multiple-output (MIMO) system in a wireless communication system, which can allow an iterative algorithm to converge to a rate and a larger local optimal value, thereby improving linear precoding Encoding performance. Background technique [0002] In order to maximize the rate sum (sum rate) of a downlink multi-user (multi-user) multiple-input multiple-output (MIMO) system, advanced precoding / decoding (precoding / decoding) technologies are continuously proposed. The precoding algorithm based on dirty paper coding and iterative water-filling has very high computational complexity, so it still has great limitations in practical applications. Due to its low complexity, the linear precoding decoding method has received extensive attention from academia and industry in recent years. The block diagram of linear precoding and decoding in downlink multi-user MIMO syste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08
CPCH04W52/42
Inventor 那崇宁侯晓林加山英俊
Owner NTT DOCOMO INC
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