北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2012, Vol. 35 ›› Issue (2): 68-71.doi: 10.13190/jbupt.201202.68.sunp

• 研究报告 • 上一篇    下一篇

调制电平随谱效率增长非指数上升的编码调制

孙鹏,李道本   

  1. 北京邮电大学 信息与通信工程学院, 北京 100876
  • 收稿日期:2011-05-16 修回日期:2011-07-14 出版日期:2012-04-28 发布日期:2012-01-05
  • 通讯作者: 孙鹏 E-mail:sunsonsp@gmail.com
  • 作者简介:孙鹏(1983-),男,博士生,E-mail:sunsonsp@gmail.com 李道本(1939-),男,教授,博士生导师
  • 基金资助:

    国家科技重大专项项目(2009ZX03003-006-04)

A Novel Coded Modulation Scheme with Smaller Constellation

SUN Peng,LI Dao-ben   

  1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2011-05-16 Revised:2011-07-14 Online:2012-04-28 Published:2012-01-05
  • Contact: Peng SUN E-mail:sunsonsp@gmail.com

摘要:

为了降低通信系统传输信号的峰均比,提出了一种相比同谱效率正交幅度调制(QAM)减少电平数的编码调制方案.通过选择合适的码率与映射规则,调制时无需在比特向量到星座点之间建立一一映射的关系;相比一般的调制系统,该系统减少了星座点数量,增大了星座点间距离,可因此获得更低的陡降门限和峰均比. 同时, 对该系统的若干设计准则进行了分析,并根据相关准则设计了一种代替传统64QAM调制的新型星座. 仿真结果显示,该方案误码率性能可超过传统采用64QAM的比特交织编码调制系统.

关键词: 映射规则, 编码调制, 软解调, 比特交织编码调制

Abstract:

A new coded modulation scheme is proposed using fewer constellation points than normal quadrature amplitude modulation (QAM). With properly designed code rate and labeling strategy, it is not necessary to map one to one from bit vectors to channel symbols. Iterative decoding and demodulation of the new scheme could obtain earlier turbo cliff compared with the coded modulation system with normal QAM constellation. As an example, a new constellation is constructed to replace the commonly used 64QAM based on the design rules of such systems. Experiments show the effectiveness of the new scheme.

Key words: labeling strategy, coded modulation, soft decoder, bit interleaved coded modulation with iterative detection

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