Survival constellation point choosing method and QRM-maximum likehood detection (QRM-MLD) signal detection method

Abstract

The invention relates to the technical field of wireless communication and provides a survival constellation point choosing method. The survival constellation point choosing method comprises the steps that n QAM modulation constellation patterns are divided into n parts, each part comprises one constellation point, a constellation point belonging to the same part is chosen according to the positions in the constellation patterns, and log2n nearest-distance constellation points used for calculating soft bite measurement are chosen according to the chosen constellation. The invention further provides a QRM-maximum likehood detection (QRM-MLD) signal detection method. A survival constellation point assembly comprises all constellation points used for soft information measurement calculation and guarantees soft information calculation accuracy. The survival constellation point choosing method fully uses the characteristics of constellation diagram reflection. The chosen constellation points used for soft information measure calculation are close to pre-detection results so as to guarantee effectiveness of the required constellation points. Based on a detected signal to noise ratio (SNR) principle, survival constellation point assemblies are increased in a self-adaptive mode. Thus, performance and complexity can be compromised reasonably.

Description

technical field [0001] The present invention relates to the field of wireless communication technology, in particular to a method for selecting surviving constellation points and a maximum likelihood (QRM-MLD for short) signal detection method combined with QR decomposition and M algorithm, which belongs to the multiple-input multiple-output (MIMO) system The signal detection method under the present invention can be applied to high-speed wireless communication systems under various cellular systems and high-throughput wireless local area network systems, and is especially suitable for signal detection under high-speed vertical layered space-time systems. Background technique [0002] As a solution that can meet the high-capacity requirements of future wireless communication systems, the MIMO system has received great attention. In the MIMO system, the transmitting end uses multiple antennas to transmit signals, and the receiving end uses multiple antennas to receive signals...

AI Technical Summary

Problems solved by technology

[0021] The method of the present invention for generating the surviving constellation subset in the prior art either the surviving constellation subset is too large to effectively reduce the complexity, or the surviving constellation subset is too small to include all symbols to calculate the constellation required for soft bit measurement, resulting in performance degradation problem, the present invention provides a survivor constellation point selection method and a QRM-MLD signal detection method

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