OFDM信号的识别方法分析  

Research on Modulation Identification of OFDM Signals based on Higher Order Cumulant

作　　者：王永娟[1] 

机构地区：[1]西安电子科技大学,陕西西安710126

出　　处：《机械管理开发》2013年第4期77-78,共2页Mechanical Management and Development

摘　　要：文章首先介绍了信号调制识别技术的研究内容、发展历史和趋势,阐述了研究的目的和意义。然后分析了OFDM技术的原理、优缺点和发展趋势。重点研究了低信噪比﹑多径瑞利衰落信道条件下,基于高阶累积量的OFDM信号盲识别技术。提出了利用奇数阶累积量区分OFDM信号与单载波信号的方法,并对基于三阶和五阶累积量的算法进行了仿真分析。结果表明基于三阶累积量的OFDM信号识别方法性能较好,具有一定的抗多径能力。Firstly, the paper introduces the definition, the history and the development of the signal identification techniques and the principles, the advantages and the disadvantages of the OFDM technique. Then, the paper focuses on the identification of the OFDM signals without any prior-knowledge based on the higher order cumulants in the low SNR and the multipath Rayleigh fading channels. For the channels which are low-SNR and multipath Rayleigh fading, the paper proposes the technique of using the odd-order cumulants as the feature to achieve the classification between OFDM and the single-carrier signals. The algorithms based on the 3th - order and the 5th-order cumulants have been simulated and the results show that the identification of the OFDM signals based on the 3th-order cumulants has a better performance and a certain degree of anti-multipath capability.

关 键 词：号调制类型识别 高阶累积量 支撑矢量机 小波消噪 

分 类 号：N919.3[自然科学总论]