Fading characteristics and capacity of deterministic downlink mimo fading channel simulation model with non-isotropic scattering

Abstract

We explore in this paper one novel deterministic simulation model for downlink multiple-input multiple-output (MIMO) fading channel in wireless communication. The von Mises function, which characterizes accurately the distribution of non-isotropic scattering around mobile station, is used to deterministic modeling process for both space-time codes (STC) scenario and downlink beam-forming (DBF) scenario. Statistical fading characteristics of the simulated MIMO channel, including level-crossing rate, average duration of fades and envelope cross-correlation, are studied. The impact of non-isotropic scattering on MIMO-link capacity is also investigated. The numerical results show that existence of non-isotropic scattering degraded ergodic capacity of MIMO channel by 1 bit/Hz/s in the case of STC scenario. And the maximum achievable capacity in the case of DBF scenario is always lower than that of STC scenario because transmit steering vector affected the transmit antenna correlation. The proposed MIMO channel simulation model has a universal structure and requires less parameter measurements. Hence, it can be used effectively for link-level simulation and capacity evaluation in MIMO wireless communication systems.