Abstract: This paper researches the structure of Trellis-coded Modulation(TCM) coding, and proposes a modified TCM coding scheme based on Gray mapping, which further improves the performance of TCM system. Both Hamming distance and Euclidean distance are engaged to elaborate optimized coding scheme and constellation mapping. Detailed TCM coding schemes for 8PSK and 16QAM based on the proposed method are presented. Simulation results show that about 0.3 dB coding gain can be obtained without extra computing cost.

Key words: Trellis-coded Modulation(TCM), coding criterion, Gray mapping, high order modulation, coding gain

摘要： 研究网格编码调制(TCM)中编码调制的结合方式，提出一种基于格雷映射的TCM编码方案。通过优化编码方式和星座布局调整汉明距离和欧式距离，在此基础上设计8PSK和16QAM编码器。仿真结果表明，在不增加额外开销和算法复杂度的前提下，该方案的编码增益比传统方案提高约0.3 dB。

关键词: 网格编码调制, 编码准则, 格雷映射, 高阶调制, 编码增益

CLC Number: 

• TP393