Use this function to create Rayleigh fading channels

filename: rayleigh_fading.m function: rayleigh fading input parameters: multipath_ID (user, multipath) output parameters: envelope read files: no generate files: no call functions: no called by: wireless_UL, wireless_DL

瑞利衰落的matlab仿真程序，可计算电波传播过程的瑞利衰落。-Rayleigh fading matlab simulation program can calculate the wave propagation process Rayleigh fading.