基于累积量和循环相关值的OFDM信号联合检测

Joint Detection Method Based on Cumulants and Circular Correlation Values for OFDM Signal

为了提高在复杂信道环境下正交频分复用(OFDM)信号检测方法的性能,根据OFDM信号的渐进高斯性、自相关性、循环平稳性等特性,提出了一种基于累积量和循环相关值的OFDM信号联合检测方法。在瑞利多径衰落信道下对此方法进行了仿真研究,研究表明此方法能够有效抑制噪声和频率选择性衰落的影响,且弥补了其他方法难以区分高斯信号和OFDM信号这一不足,提高了对OFDM信号的检测率。

In order to improve the performance of complex channel environment orthogonal frequency division multiplexing （OFDM） signal detection method, according to the progressive Gaussianity of the OFDM signal, the autocorrelation, cyclostationarity characteristics, the joint detection method based on cumulants and circular correlation values for OFDM signal is proposed. This method is simulated in Rayleigh multipath fading channels. The studies show that this method can effectively suppress the effects of noise and frequency selective fading, and make up for the inadequate that the other methods are difficult to distinguish between a Gaussian signal and OFDM signal to improve the detection rate of the OFDM signal.