這個檔案裡面的matlab的m函數，產生有效的都普勒fd隨機相關的瑞利衰減包絡，可以輸入你想要的doppler ferquecy和sampling ferquecy -This file inside the matlab m-function, effective Doppler fd related Rayleigh random attenuation envelope, you can enter your desired doppler ferquecy and sampling fe