Statistical Characteristics and Capacity Evaluation of Deterministic Downlink MIMO Channel Model Under Non-isotropic Scattering Environment

Most of multiple-input multiple-output (MIMO) channel simulation models are established with the assumption of typical “Clarke” model, namely, isotropic scattering is adopted around receiver. And most of modeling methods is too complex, or need much more measured data. In this paper, one simple deterministic modeling method for downlink MIMO channel with non-isotropic scattering around mobile station (MS) is presented. The proposed MIMO channel simulation model has a general structure for both space-time coding and downlink beam-forming scenarios. The channel simulation model is setup by utilizing the “von Mises” function, which characterizes accurately the distribution of non-isotropic scattering. Implementation structure and required parameters is also described in details. Finally, statistical fading characteristics of the simulated MIMO channel are investigated by level-crossing rate, average duration of fades and cross-correlation factor. And numerical results show the impact of non-isotropic scattering on capacity evaluation of the MIMO channel. It’s verified that channel capacity degraded as amounts of nonisotropic components increase.