结合残留冗余信息与MMSE估计的信源信道联合编解码  

Joint source-channel coding using residual redundancy and MMSE estimation

作　　者：殷玮玮[1] 吴乐南[1] 

机构地区：[1]东南大学无线电工程系,江苏南京210096

出　　处：《电路与系统学报》2006年第3期150-152,共3页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60072013)

摘　　要：文中提出一种利用残留冗余的RDPCM信源信道联合编码系统与最小均方误差估计结合的方法。首先,本文针对联合编码系统修正了SOVA算法,在接收端获得利用残留冗余后的比特似然度;然后利用这些后验信息,对信源预测编码器的输出符号值进行最小均方误差重建后再进行信源译码,从而减小了由于硬判决得到符号值所带来的失真。仿真结果显示这种算法在信噪比的低端最大得到了约2dB的增益。A joint source-channel coding scheme using residual redundancy and MMSE estimation is proposed. Firstly, the bit likelihood value of the modified soft output Viterbi algorithm using residual redundancy is obtained. Then, it is used to estimate the symbol value of the source predictor passed by channel before source decoding with MMSE. This algorithm can reduce the distortion by the hard output of the symbol. Simulations demonstrate the suggested algorithm can obtain at most 2dB gains in performance.

关 键 词：信源信道联合编码 最小均方误差估计 RDPCM、残留冗余 修正的SOVA算法 

分 类 号：TN91[电子电信—通信与信息系统]