ZPOFDM循环平稳性分析及在多载波信号识别中的应用

摘要

An improved OFDM signal recognition algorithm is proposed to distinguish the zero-padding OFDM (ZPOFDM) signal from multicarrier signals. Based on the second-order cyclic cumulant of ZPOFDM and other signals and combined with a cyclostationary test, the algorithm can classify signals such as ZPOFDM, cyclic-prefix OFDM (CPOFDM), and single carrier signals in fading channel. The theoretical analysis and simulations confirm the effectiveness of discriminating multicarrier signals in frequency selective channels without synchronization and parameters estimation.%针对多载波调制分类算法无法识别零前缀正交频分复用(zero-padding OFDM,ZPOFDM)信号的问题,提出了一种改进的OFDM信号识别方法.利用ZPOFDM等信号的二阶循环累积量特征,结合循环平稳性检测,实现衰落信道下包括ZPOFDM、循环前缀正交频分复用(cyclic-prefix OFDM CPOFDM)、单载波等信号的分类.理论分析与实验结果表明,该方法在没有同步及参数估计等预处理条件下能实现频率选择性衰落信道下多载波信号的有效区分.