改程序实现了大尺度和小尺度衰落信道的模拟，可以通过改变载波、通信距离、阴影衰落标准差来观察信道容量的变化。-Change the program to achieve a large-scale and small-scale fading channel simulation, you can change the carrier, communication distance, shadow fading standard deviation to observe the changes in channel capacity.