衰落信道幅值仿真编程：对瑞利衰落信道进行仿真，并加上高斯白噪声，通过输入不同的信噪比 比较其误码率变化-Amplitude fading channel simulation programming: on the Rayleigh fading channel simulation, and add white Gaussian noise, by entering a different signal to noise ratio to compare their error rate ch