多径信道下OFDM信号子载波的调制方式识别新方法

doi:10.3969/j.issn.1001-2400.2011.05.004

J4 ›› 2011, Vol. 38 ›› Issue (5): 20-26.doi: 10.3969/j.issn.1001-2400.2011.05.004

多径信道下OFDM信号子载波的调制方式识别新方法

刘明骞;李兵兵;赵雷

(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，陕西西安 710071)

收稿日期:2011-02-21 出版日期:2011-10-20 发布日期:2012-01-14
通讯作者: 刘明骞
作者简介:刘明骞(1982-)，男，西安电子科技大学博士研究生，E-mail: mqliu@mail.xidian.edu.cn
基金资助:
国家“863”高技术研究发展计划资助项目(2007AA01Z288);国家自然科学基金资助项目(60772138);高等学校学科创新引智计划资助项目(B08038)

Novel modulation identification scheme for subcarriers of OFDM signals in the multipath channel

LIU Mingqian;LI Bingbing;ZHAO Lei

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071， China)

Received:2011-02-21 Online:2011-10-20 Published:2012-01-14
Contact: LIU Mingqian

摘要/Abstract

摘要：

针对非合作通信系统中，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，提出了一种OFDM信号子载波调制方式识别的新方法．该方法首先运用4阶与2阶累积量的组合特征，去除OFDM子载波信号中的空载波信号，然后利用4阶累积量和6阶累积量的组合特征，滤除纯导频子载波信号和部分混有导频的调制子载波信号，最后基于改进的减法聚类方法，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识别．实验仿真结果表明，该方法在多径信道条件下具有稳健的识别性能．

关键词: 调制识别, OFDM信号, 高阶累积量, 减法聚类

Abstract:

In view of modulation identification of subcarriers of orthogonal frequency division multiplexing(OFDM) signals with a pilot in a multipath channel is a difficult problem in the non-cooperation communications system, a novel method for recognition of the subcarriers modulation of OFDM signals is proposed. The method firstly removes the null carrier signals of the OFDM using the combination characteristic of fourth-order and second order cumulants, and then filters out the pure pilot subcarrier signals and some of the modulated subcarrier signals with a pilot by the combination feature of fourth-order and sixth-order cumulants. Finally, it recognizes the modulated subcarrier signals which are less affected by pilots with the improved subtractive cluster method. Simulation results show that the proposed method has robust recognition performance in the multipath channel.

Key words: modulation recognition, OFDM, high-order cumulant, subtractive clustering

中图分类号:

TN911.7

刘明骞;李兵兵;赵雷. 多径信道下OFDM信号子载波的调制方式识别新方法[J]. J4, 2011, 38(5): 20-26.

LIU Mingqian;LI Bingbing;ZHAO Lei. Novel modulation identification scheme for subcarriers of OFDM signals in the multipath channel[J]. J4, 2011, 38(5): 20-26.

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多径信道下OFDM信号子载波的调制方式识别新方法

Novel modulation identification scheme for subcarriers of OFDM signals in the multipath channel

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