包括调制，解调，信噪比计算，预报误差法参数辨识-松弛的思想，使用高阶累积量对MPSK信号进行调制识别。- Includes the modulation, demodulation, signal to noise ratio calculation, Prediction Error Method for Parameter Identification- the idea of relaxation, Using high-order cumulants of MPSK signal mod