基于高阶循环累积量的正交频分复用(OFDM)信号子载波调制识别算法  

A High-order Cyclic Cumulants-based Modulation Identification Algorithm for OFDM Sub-carriers

作　　者：刘瑜[1] 张天骐[1] 李灿[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《科学技术与工程》2014年第20期251-256,共6页Science Technology and Engineering

基　　金：国家自然科学基金项目(61071196;61102131);教育部新世纪优秀人才支持计划项目(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金项目(CSTC2011jjjq40002);重庆市自然科学基金项目(CSTC2009BB2287;CSTC2010BB2398;CSTC2010BB2409;CSTC2010BB2411)资助

摘　　要：针对OFDM(正交频分复用)信号的子载波调制方式在高斯信道下的盲识别问题,提出一种基于高阶循环累积量调制识别方法。通过理论分析了高斯信道下子载波采用不同调制方式的OFDM信号的四阶循环累积量,并证明了只有当循环频率等于子载波频率时,OFDM信号的四阶循环累积量才不为零,由于不同调制方式的OFDM信号的四阶循环累积量值不同,因此将信号四阶循环累积量值作为特征量来区分信号的不同调制方式。该方法不需要任何的先验信息就能识别子载波调制方式,仿真表明该方法具有一定可行性。For the modulation mode identification for OFDM sub-carrier signals,a joint recognition algorithm with high-order cyclic cumulants-based modulation identification algorithm was proposed.Firstly,in the Gaussian channel,the fourth-order cyclic cumulants of different sub-carrier OFDM signal modulation was analyzed.Only when the cycle frequency was equal to the sub-carrier frequency,the fourth-order cyclic cumulants of OFDM signal was not zero.Because the fourth-order cycle cumulants differ as for different modulation of OFDM signals,the fourth-order cycle cumulants was regarded as a feature to distinguish different modulation signals.This method does not need any prior information.The simulation shows that it has some theoretical value.

关 键 词：OFDM 高阶循环累积量 调制识别 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]