中文说明：（Rayleigh fading channel）是一种无线电信号传播环境的统计模型。这种模型假设信号通过无线信道之后，其信号幅度是随机的，即“衰落”，并且其包络服从瑞利分布。这一信道模型能够描述由电离层和对流层反射的短波信道，以及建筑物密集的城市环境。瑞利衰落只适用于从发射机到接收机不存在直射信号（LoS，Line of Sight）的情况，否则应使用莱斯衰落信道作为信道模型。
English Description：
(Rayleigh fading channel) is a statistical model of the radio signal propagation environments. This model assumes that after signals over wireless channels, the signal amplitude is random, or "decline", and the envelope is Rayleigh distributed. This channel model can be described by ionospheric and tropospheric reflective HF channel, as well as built-up urban environments. Rayleigh fading is only suitable for direct signal from the transmitter to the receiver does not exist (LoS,Line of Sight), you should use the rician fading channel model.