调制信号的识别，可以通过各种调制的功率谱不同来识别，但这种方法在小信噪比下，性能不好，通过循环功率谱来识别，仿真表明在小信噪比下有很好的性能-Identification of modulated signals can be modulated through a variety of different power spectrum to identify, but this method under low SNR, the performance is not good, through