摘要： 提出了一种基于VLC 和LDPC 的联合信源信道译码算法。在迭代过程中，利用VLC 信源序列中的冗余信息校正LDPC 译码的迭代软信息，增强LDPC 译码器的纠错性能，并加速LDPC 译码迭代收敛。BSC 信道的仿真结果证实了该联合信源信道解码算法性能优越。

关键词: 信源信道联合解码；VLC；MAP 译码；LDPC；置信传播算法；BSC 信道

Abstract: This paper proposes a joint source-channel decoding based on the VLC and LDPC codes. The method uses the residual information in the VLC source sequence to modify the soft information in the LDPC iterative decoding algorithm. The result shows it enhances the abilities of correcting errors and speeds up the convergence. In the end, it gives the results on the BSC channel

Key words: Joint source-channel decoding (JSCD); VLC; MAP decoding; LDPC; Belief propagation algorithm; BSC channel