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计算机工程 ›› 2011, Vol. 37 ›› Issue (21): 61-63. doi: 10.3969/j.issn.1000-3428.2011.21.021

• 网络与通信 • 上一篇    下一篇

一种基于格雷映射的TCM编码方案

沈寅涛,王琳凯,周晓方   

  1. (复旦大学专用集成电路与系统国家重点实验室,上海 201203)
  • 收稿日期:2011-04-28 出版日期:2011-11-05 发布日期:2011-11-05
  • 作者简介:沈寅涛(1986-),男,硕士研究生,主研方向:数字基带信号处理,多媒体技术;王琳凯,博士研究生;周晓方,高级工程师
  • 基金资助:
    :国家自然科学基金资助项目(60876016);宁波市自然科学基金资助项目(2009A610059);复旦大学专用集成电路与系统国家重点实验室基金资助项目(ZD20080103)

TCM Coding Scheme Based on Gray Mapping

SHEN Yin-tao, WANG Lin-kai, ZHOU Xiao-fang   

  1. (State Key Lab of ASIC & System, Fudan University, Shanghai 201203, China)
  • Received:2011-04-28 Online:2011-11-05 Published:2011-11-05

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

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

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