中文说明：
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。
English Description：
The modified program realizes the simulation of large-scale and small-scale fading channels. The change of channel capacity can be observed by changing carrier, communication distance and shadow fading standard deviation