一种M-QAM软判决解映射的简化算法研究  

Research of Simplified Soft-output Demapping Algorithm for M-QAM

作　　者：王晓晴[1] 杨知行 彭克武[1] 王劲涛[1] 

机构地区：[1]清华大学信息科学与技术国家重点实验室,北京100084

出　　处：《电视技术》2008年第1期17-19,共3页Video Engineering

基　　金：国家"863"计划项目(2006AA01Z279)

摘　　要：提出了一种适用于所有M-QAM软判决解映射的简化算法,并将其扩展到不对称的二维QAM解映射中,如DTMB中的32-QAM。并以32-QAM为例,用计算机仿真比较了不同算法的编码系统误码率和解码时间等性能。结果表明,在降低M-QAM软判决解映射的判决复杂度时,该简化算法没有损失信噪比,性能良好,适用于DTMB系统。A new simplified soft-output demapping algorithm for M-QAM is proposed in this paper, and the method is expanded to unsymmetric 2-D QAM demapping such as 32-QAM in DTMB. Then taking 32-QAM for example, the performances of DTMB system with different algorithms are simulated, such as bit error rate and decoding time. The results show that the simplified algorithm decreases the soft-output demapping complexity without the loss of signal-to-noise ratio and has acceptable performance for DTMB system.

关 键 词：通信 M-QAM映射 解映射 不对称二维QAM 

分 类 号：TN949.197[电子电信—信号与信息处理] TP312[电子电信—信息与通信工程]