基于FRFT的小波包调制信号的识别研究

Study on the Identification of Wavelet Packet Modulation Signal Based on Fractional Fourier Transform

该文基于正交频分复用调制和小波包调制信号的调制原理,利用分数阶傅立叶变换的时频旋转特性,探讨了在高斯信道、瑞利信道和频率选择信道下小波包调制信号的识别。仿真实验结果表明,该方法具有良好的识别性能,不需要任何信道参数,能较好的实现盲信道的小波包调制识别。

Based on the modulation structure characteristics of wavelet packet modulation（WPM） and orthogonal frequency division multiplexing（OFDM）,this paper studies the identification of WPM in the AWGN,Rayleigh and frequency selective channels by a rotation in the time frequency plane of fractional Fourier transform（FRFT）.Simulation results indicate that the proposed method has good performances,and is robust to the Gauss noise.Moreover,the method can realize recognition of WPM in blind channels.