A modified non-stationary MIMO channel model under 3D scattering scenarios

Due to rapid movements of the transmitter and receiver, propagation channels of mobile communication systems show non-stationarity characteristics. A modified non-stationary multiple-input multiple-output (MIMO) channel model between the base station and mobile station under three dimensional (3D) scenarios is proposed. The new model takes the continuity of fading phase into account and guarantees more realistic Doppler frequencies. Meanwhile, extended 3D time evolving algorithms of channel parameters, including the path number based on birth-death processes of clusters, path delays, path powers, and angles of arrival and departure, are given and analyzed. Analytical and simulation results demonstrate that our channel model can characterize the properties of non-stationarity, and simulated results of time-variant autocorrelation function (ACF) and spatial cross-correlation function (CCF) are well consistent with the corresponding theoretical ones. The proposed channel model can be applied to performance evaluation and validation of the fifth generation (5G) wireless communication systems under time-variant scattering scenarios.