Abstract: The research of fading channel simulation in complex communication environment is of vital importance to the study of space-time signal processing technologies.In this paper,an autoregressive(AR) model is presented for the simulation of flat fading channel in complex communication environments.It explores the second order statistics of fading envelopes influenced by nonisotropic scattering environments with light-of-sight(LOS),and uses an AR model for channel simulation.The simulation results show that it is a highly accurate approach with comparatively small computing amount.Besides,the(general) applicability of the method is demonstrated by examples involving the accurate synthesis of fading channel models in complex communication environments.