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MIMO signal detection method

A technology for signal detection and detection results, applied in the directions of space transmit diversity, baseband system components, diversity/multi-antenna systems, etc., can solve problems such as not greatly increasing the computational complexity, and achieve the effect of improving detection performance and low complexity

Inactive Publication Date: 2015-08-12
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0013] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a MIMO signal detection method to solve the technical problem of not greatly increasing the computational complexity when improving the detection performance of the detection method

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Embodiment Construction

[0039] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0040] refer to figure 1 As shown, the present invention first introduces the existing MIMO wireless communication system. The simplified block diagram of a multiple-input multiple-output (MIMO) wireless communication system is as follows: figure 1 shown.

[0041] The original symbol sequence is channel-coded, interleaved (or not channel-coded, interleaved), and then serial-to-parallel transformed to obtain a symbol vector sequence to be sent. Each symbol vector in the sequence is sent in parallel in a slot, for example, without loss of generality, the symbol vector s is sent in parallel in the slot [0,T]. A symbolic vector s is denoted as

[0042] s=[s 1 the s 2 …s N ] T , (1)

[0043] Its dimension is N, so N modulators and N transmit antennas are required in the transmitter to modulate and transmit N symbols in s respective...

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Abstract

The invention discloses an MIMO signal detection method, comprising a first step of calculating an MP inverse matrix of a channel matrix, and calculating a judgment variable vector; a second step of quantitatively detecting all elements in the judgment variable vector, obtaining the detection result of a symbol vector and then obtaining an estimated value of a noise item in the judgment variable vector; and a third step of, during each iteration detection, detecting a symbol sk in the symbol vector, and selecting the sk for detection if the estimated value of the corresponding noise item in the judgment variable vector to the sk is the weakest, the sk being the k-th element in the symbol vector. Compared with conventional MMSE-Simplified-OSIC-DLR and MMSE-OSNPC-DLR detecting schemes, the MIMO signal detection method significantly improves the detecting performance, further approaches the optimal detecting performance, and meanwhile maintains the original relatively low complexity.

Description

technical field [0001] The invention relates to a MIMO (multiple-input multiple-output, MIMO, multiple-input multiple-output) signal detection method, in particular to a low-complexity approximation to the best MIMO signal detection method. The invention belongs to a wireless communication system, in particular to a signal detection technology of a multi-input multi-output wireless communication system. Background technique [0002] In a multiple-input multiple-output wireless communication system, the detection of MIMO signals, referred to as MIMO detection, includes three basic methods, which are briefly described as follows. [0003] 1) Maximum likelihood detection [0004] Maximum likelihood (maximum likelihood, ML) detection is a well-known optimal detection, which can achieve full diversity (the diversity order is equal to the number of receiving antennas), and has the best detection performance. However, its computational complexity increases exponentially with the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/08H04L25/02
Inventor 刘金铸
Owner NANJING UNIV OF INFORMATION SCI & TECH