中文说明：单径或多径瑞利衰落信道仿真，有循环检测，周期性检测，对于初学者具有参考意义，代码里有很完整的注释和解释，具有丰富的参数选项,考虑雨衰 阴影 和多径影响。
English Description：
Single path or multipath Rayleigh fading channel simulation and detection of circulating, periodic inspection, for beginners has reference significance, the code is very complete annotated and explained, has a wealth of options, taking into account the rain fading shadowing and multipath effects.