基于累量的OFDM信号调制识别

提出了一种快变瑞利衰落信道下的OFDM信号与单载波信号的类间调制识别新算法。接收到的射频信号经模数变换后,不需要下变频,直接进行处理。利用数字信号的2阶和4阶累量的组合作为分类特征信息,方法简单易行,不需要任何信号和信道噪声的先验知识。仿真结果表明,新算法具有良好的识别性能,在SNR不小于7 dB时能达到90%以上的正确识别率。

Modulation Identification Based on Cumulants for OFDM Signal

A novel modulation identification algorithm based on cumulants to discriminated OFDM signal from the single-carrier modulation signals over a time-varying Rayleigh fading channel is proposed.The re- ceived radio-frequency signal after A/D transformation does not perform down conversion and is processed in the radio-frequency condition.By using the combination of second-order and fourth-order cumulants of digital sig- nal as the classification feature,the method is easy to carry out without any preprocessing and any prior knowl- edge of the signals and channel.Simulation results demonstrate the good performance of the new algorithm and show that an over 90% correct classification rate could be reached when the SNR is above 7dB.