高阶矩的衰落信道中OFDM信号检测算法

正交频分复用是一种具有很强抗多径干扰、码间干扰和窄带干扰以及很高频谱利用率的高效数据传输技术,已经得到广泛的应用;OFDM信号的自动识别和调制参数的估计是非协作通信和认知无线电中的关键问题。以基于高阶累计量的正交频分复用(OFDM)信号检测算法为研究对象,针对衰落信道将影响信号高阶统计特性的问题,提出一种适用于衰落信道环境中的基于高阶矩的OFDM信号检测算法,用以区别多载波信号(OFDM)与单载波信号(MFSK,MQAM);并通过数学推导和仿真数据验证了所提算法的可行性和衰落信号适应能力。

Detection Methods of OFDM Signal in Fading Channels Based on Higher Order Moments

Orthogonal Frequency Division Multiplexing(OFDM) technique is an efficient data transmission technique with good immunity for the effects of multi-path channel interference,inter-symbol interference,narrowband interference and high frequency spectrum utilization ratio.It has been widely used in practice.Automatic identification and modulated parameter estimation of communication signal of OFDM are key technologies in non-cooperative communication and software radio.Aiming at the detection methods of OFDM signal based on higher order cumulants,the paper proposes a novel method used to detect OFDM signal in the fading channel based on four higher order moments.This method can detect OFDM from signal-carrier modulated signals(MPSK or MQAM).Theory analysis and simulation date can prove that the algorithm has beautiful detection and identification defection and fading signal adaptability.