说明：  此程序采用频域法产生一个复高斯过程. 其中，RayJakes.m采用频域方法产生具有Jakes功率谱的瑞利衰落过程 子程序Jakes_filter用于产生具有Jakes功率谱的FIR滤波器冲激响应
(This program uses a frequency domain method to produce a complex Gaussian process Among them, the RayJakes.m frequency domain method to generate the Rayleigh fading process with Jakes power spectral The subroutine Jakes_filter used to generate the Jakes power spectral FIR filter impulse response )