中文说明：瑞利衰落能有效描述存在能夠大量散射無線電訊號的障礙物的無線傳播環境。若傳播環境中存在足夠多的散射，則衝激訊號到達接收機後表現為大量統計獨立的隨機變量的疊加，根據中心極限定理，則這一無線頻道的衝激響應將是一個高斯過程。如果這一散射頻道中不存在主要的訊號分量，通常這一條件是指不存在直射訊號（LoS），則這一過程的均值為0，且相位服從0 到2π 的均勻分布。即，頻道響應的包絡服從瑞利分布。
English Description：
Rayleigh fading can effectively describe the wireless propagation environment with a large number of obstacles scattering radio signals. If there is enough scattering in the propagation environment, the impulse signal will appear as the superposition of a large number of statistically independent random variables when it reaches the receiver. According to the central limit theorem, the impulse response of this wireless channel will be a Gaussian process. If there is no main signal component in the scattering channel, usually the condition is that there is no direct signal (LOS), then the mean value of the process is 0 and the phase obeys a uniform distribution of 0 to 2 π. In other words, the envelope of channel response obeys Rayleigh distribution.