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电子学报  2007 

基于一种新的SNR估计方法的切换迭代均衡

, PP. 184-188

Keywords: 缩放Max-Log-MAP算法,软输出信息,SNR估计,迭代均衡

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Abstract:

本文提出了一种缩放软信息的Max-Log-MAP迭代均衡算法(ScaledMax-Log-MAP,SMLM)的性能,并分析了它对SNR估计误差的敏感性问题,结果表明在低损失信道上,SMLM算法能有效改善Max-Log-MAP(MLM)迭代均衡算法的性能,并不受SNR估计误差的影响.考虑到在初始迭代,MLM硬判决结果可能有错误,本文还提出了一种改进的由MLM切换到LM的均衡算法,大大改善了未进行SNR校正时的误码性能.最后,本文还建议了一种由SMLM切换至LM的迭代均衡算法,它进一步改善了高损失信道上迭代均衡系统的性能,尽管本文建议的两种切换均衡算法均不需要任何导引开销.

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