对数字基带信号在有高斯白噪声干扰的情况下采用相干解调方法对2PSK信号进行解调，具体是通过Matlab6.5集成环境下用M文件调用数字解调函数ddemod编制程序来实现PSK信号的解调。-For digital baseband signal in a gaussian white noise interference coherent demodulation method used to 2 PSK signal demodulation, specific is through the Matlab6.5 integration environment with M document calls digital demodulation ddemod function program to achieve PSK signal demodulation.