说明：  对实际降雨信道环境的模拟，根据不同的降雨概率，得到降雨的类型，以及降雨引起的路径损耗值。对于想要仿真实际环境和信道，可以加入降雨这一干扰，作为对性能评估的一个影响因素，其中涉及到的降雨类型及对应的雨衰减率依据国标。
(Simulation of the actual channel environment rainfall, depending on the probability of rain, to get the type of precipitation, and the path loss value due to rainfall. For those who want the physical environment and channel emulation, you can add rain this interference as a factor for performance evaluation, which relates to the rainfall patterns and the corresponding rain attenuation rate based on the national standard.)