基于修正自相关函数的OFDM信号调制识别  

OFDM Signal Modulation Recognition Under Multipath Fading Channel

作　　者：张红超[1] 欧阳喜[1] 张冬玲 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《信息工程大学学报》2016年第2期155-160,共6页Journal of Information Engineering University

基　　金：国家自然科学基金资助项目(61401511)

摘　　要：以CP-OFDM、ZP-OFDM、SCLD、CP-SCLD 4类信号作为研究对象,针对OFDM信号序列的自身周期性对其循环自相关函数表达式进行了修正,并加以公式推导;结合OFDM信号的调制特征,提出了一种新的识别算法。所提算法无需完成任何参数估计及同步等预处理过程,理论推导及仿真结果表明,该算法具有良好的抗噪性能,且对多普勒频移及多径等信道参数表现出较强稳健性。Four such signals as CP-OFDM,ZP-OFDM,SCLD and CP-SCLD are researched in this paper. Firstly,OFDM signal’s cyclic autocorrelation function expression is modified in view of its digital sequence cycle,and the formulas are derived. Combined with the OFDM signal modulation characteristics,a new recognition algorithm is proposed. The method does not need any preprocessing tasks,such as estimation of any parameters and synchronization. Theoretical analysis and simulations show that this algorithm has a better anti-noise property,and shows strong robustness to channel parameters,such as the Doppler shift and multi-path.

关 键 词：调制识别 OFDM 多径衰落 循环自相关 峰均比 

分 类 号：TN911.72[电子电信—通信与信息系统]