Signal detection method and apparatus for MIMO system

Abstract

The invention relates to a signal detection method of a multi-input multi-output system and a device thereof. The system is provided with m sending antennae and n receiving antennae. The method comprises the following steps: a current channel response matrix is utilized to estimate and obtain a linear filtering matrix which performs the linear filtration to a current receiving signal, so an estimation sending symbol vector is obtained; each symbol in the estimation sending symbol vector is performed the hard decision to obtain a symbol vector described by constellation points, a symbol of the maximum probability value accurately demodulated can be found in the symbol vector, and the symbol is used as the estimation value of symbols having the same sequence number in the sending symbol vector; the current receiving signal and the current channel response matrix are updated for eliminating the influences of the symbols obtained the estimation value to the receiving signal and the corresponding antennae to the channel response matrix; the three steps are performed circularly until the estimation values of all symbols in the sending symbol vector are obtained. The detection algorithm and the device cause the detection performance of an MIMO signal to approach the ML detection algorithm, and the complexity is nearly less one order of magnitude than the ML.

Description

technical field [0001] The invention relates to a multiple-input multiple-output (MIMO) wireless communication system, in particular to a method and device for realizing signal detection in the MIMO system adopting space multiplexing. Background technique [0002] Multiple-input multiple-output (MIMO) technology has been recognized as a core technology of the third generation (B3G) mobile communication system because it can improve the spectrum efficiency of the wireless communication system without increasing the system bandwidth, and it has been established in 3GPP for a long time. Evolution (LTE) and IEEE 802 series have been fully applied. The International Telecommunication Union (ITU) requires that the downlink transmission rate of the 4G system can reach 1Gbps, which must be realized through MIMO technology. [0003] The MIMO system uses multiple transmitting antennas and multiple receiving antennas for data transmission. According to the Vertical Bell Laboratory Spa...

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Problems solved by technology

However, the performance of the V-BLAST ZF-SIC and V-BLAST MMSE-SIC detection algorithms is mainly based on the order of symbol detection and the estimation of the corresponding filter vectors. The ordering only uses the correlation norm of the estimated channel response matrix H information, does not make full use of the information of the received signal r, therefore, its performance cannot be optimal

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