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 (4): 42-45.doi: 10.13190/jbupt.201204.42.liumq

• 论文 • 上一篇    下一篇

含有导频的OFDM信号子载波的调制方式识别方法

刘明骞1,李兵兵1,赵雷1,赵岩2   

  1. 1西安电子科技大学 综合业务网理论及关键技术国家重点实验室 2北京邮电大学 信息与通信工程学院
  • 收稿日期:2011-07-18 修回日期:2012-04-23 出版日期:2012-08-28 发布日期:2012-07-08
  • 通讯作者: 刘明骞 E-mail:lmq_mm@126.com
  • 作者简介:刘明骞(1982-),男,博士生,Email:mqliu@mail.xidian.edu.cn 李兵兵(1955-),男,教授,博士生导师
  • 基金资助:

    国家自然科学基金项目(61271299);国家高技术研究发展计划项目(2007AA01Z288);高等学校学科创新引智计划项目(B08038)

Modulation Identification Method of the Subcarriers with  Pilots for OFDM Signals

LIU Ming-qian1, LI Bing-bing1,ZHAO Lei1, ZHAO Yan2   

  1. 1State Key Laboratory of Integrated Service Networks, Xidian University  2School of Information and Communication Engineering, Beijing University of Posts and Telecommunications
  • Received:2011-07-18 Revised:2012-04-23 Online:2012-08-28 Published:2012-07-08
  • Supported by:

    the National Natural Science Foundation of China

摘要:

针对多径信道下含有导频的正交频分复用(OFDM)信号子载波调制方式难识别的问题,提出一种含有导频的OFDM信号子载波调制方式识别方法. 该方法在OFDM信号的等效模型下,首先利用高阶累积量的组合特征识别出OFDM信号中的空子载波信号和纯导频子载波信号,然后利用两个基于矢量图最小环带模值方差的特征对提取出来的受导频影响较小的调制子载波信号进行调制方式的识别. 仿真结果表明,该方法在多径信道下是有效可行的.

关键词: 调制识别, 正交频分复用, 高阶累积量, 矢量图

Abstract:

A new modulation recognition method of the subcarriers with pilots for orthogonal frequency division multiplexing (OFDM) signals is proposed. The method firstly identifies null subcarrier signals of the OFDM and the pure pilot subcarrier signals by combination features of higher order cumulants in the equivalent model of OFDM. Then, it recognizes the modulated subcarrier signals which are less affected by pilots using comparing the variance of sequences in the minimum ring of vectogram. Simulation shows that the proposed method is effective and feasible in the multipath channels.

Key words: modulation identification, orthogonal frequency division multiplexing, higher order cumulant, vectogram

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