西安电子科技大学学报（自然科学版）2011，Vol.38Issue(5)：20-26,7.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
Novel modulation identification scheme for subcarriers of OFDM signals in the multipath channel
摘要
Abstract
In view of modulation identification of subcaniers 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.关键词
调制识别/OFDM信号/高阶累积量/减法聚类Key words
modulation recognition/ OFDM/ high-order cumulant/ subtractive clustering分类
信息技术与安全科学引用本文复制引用
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].西安电子科技大学学报（自然科学版）,2011,38(5):20-26,7.基金项目
国家“863”高技术研究发展计划资助项目(2007AA01Z288) （2007AA01Z288）
国家自然科学基金资助项目(60772138) （60772138）
高等学校学科创新引智计划资助项目(B08038) （B08038）
