基于渐近高斯性的OFDM调制盲识别研究

novel identification algorithm is proposed to solve the problem of OFDM (Orthogonal Frequency Division Multiplexing) modulation’s recognition. By using the asymptotic Gaussian distribution of OFDM in time domain, HOC (Higher Order Cumulants) and cumulants rate are extracted from received signals to distinguish OFDM from other single carrier modulations. The distinctive features are improved from former algorithms, which can counteract the impact of both Rayleigh fading and Gaussian noise on receiving recognition rate effectively. The modulation identification algorithm is processed on intermediate frequency without any prior information of the received signal and channel parameters. So the method can be regarded as blind performance. Numerical results demonstrate the validity of the new algorithm, and show that over 95% recognition rate can be reached as the SNR is above 0dB.