Analysis of a Neural Detector Based on Self-Organizing Map in a 16 QAM System

Xiaoqiu WANG
Jianming LU
Takashi YAHAGI

IEICE TRANSACTIONS on Communications   Vol.E84-B    No.9    pp.2628-2634
Publication Date: 2001/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Communication Devices/Circuits
self-organizing map,  adaptive equalizer,  QAM system,  nonlinear distortion,  LMS equalizer,  

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A signal suffers from nonlinear, linear, and additive distortion when transmitted through a channel. Linear equalizers are commonly used in receivers to compensate for linear channel distortion. As an alternative, novel equalizer structures utilizing neural computation have been developed for compensating for nonlinear channel distortion. In this paper, we propose a neural detector based on self-organizing map (SOM) in a 16 QAM system. The proposed scheme uses the SOM algorithm and symbol-by-symbol detector to form a neural detector, and it adapts well to the changing channel conditions, including nonlinear distortions because of the topology-preserving property of the SOM algorithm. According to the theoretical analysis and computer simulation results, the proposed scheme is shown to have better performance than traditional linear equalizer when facing with nonlinear distortion.