复杂环境下基于高阶累积量的OFDM信号的盲识别  

Blind Recognition of OFDM Signals based on Higher Order Cumulants in Complex Environments

作　　者：魏瑾[1] 

机构地区：[1]山西机电职业技术学院信息工程系,山西长治046011

出　　处：《安阳师范学院学报》2017年第2期65-68,共4页Journal of Anyang Normal University

摘　　要：本文提出了一种在多径Rayleigh衰落信道下的OFDM信号的盲识别算法,通过提取一个基于高阶累积量的特征参数来识别OFDM信号和单载波调制信号。该特征参数可直接处理中频采样值,不需要严格的载波同步,同时还可以有效抵抗多径Rayleigh衰落和多普勒频移的影响,能实现对2FSK、2PSK、QPSK、16QAM、64QAM、0FDM等六种数字调制信号的识别。仿真结果表明,在较低信噪比下有良好的识别性能,当信噪比大于5d B时,系统的正确识别率可达100%。This paper proposes a blind identification algorithm under the condition of Rayleigh fading channels. By extracting a feature parameters based on higher order cumulants to identify OFDM signals and single carrier modulation single. The characteristic parameter can be directly with intermediate frequency sampling value, does not require strict carrier synchronization, at the same time it can also be effective against multipath Ray- leigh fading and doppler frequency shift, and realize the 2FSK, 2PSK, 4PSK , 16QAM , 64QAM, 0FDM of six kinds of digital modulation signal identification. The simulation results show that under the low signal - to - noise ratio has effective recognition performance. When signal - to - noise ratio is greater than 5 dB, the system of the correct recognition rate can reach 100%.

关 键 词：RAYLEIGH衰落信道 调制识别 OFDM 高阶累积量 

分 类 号：TN919.3[电子电信—通信与信息系统]