码主要由两条指令组成：第一个，利用式（4-2-3）计算信道增益；第二个，通过数组相乘对输入信号幅度进行尺度变换。-Code composed mainly of two instructions: the first one, using equation (4-2-3) Calculate the channel gain second, multiplied by an array of input signal amplitude scaling.

瑞丽信道仿真 噪声信号由MATLAB函数randn(1,N)产生，它从均值为0、方差为1的正态分布中产生N个伪随机数。每次迭代时，要使用相应的标准差对噪声的幅度进行尺度变换，最后，将输入信号和噪声信号相加得到输出信号。-Ruili channel simulation noise signal by the MATLAB function randn (1, N) generated, which from the mean 0, variance for a normal distribu