中文摘要：

该文对基于均方MS（Mean Square）误差最小准则估计的软输入信源解码和基于信源参数特性及迭代结构的维特比解码两种信源信道联合解码算法进行分析，分别给出系统性能提高的影响因子，同时与信源信道独立解码算法相比较，并推导了联合算法中的接收参数信噪比的提高幅度以及比特误码率的上限值，证明了联合解码算法的可行性和有效性。实验仿真结果表明了分析方法的正确性。

英文摘要：

Based on structure of MS estimation soft-bit source decoding and iterative source-controlled channel decoding, this paper deduces the parameter SNR and BER upper bound for above joint source-channel decoding respectively, and gives the factors which determine the improvement of system performance. The result shows the feasibility of joint source-channel decoding algorithm. Also, simulation proves the validity of analysis process.