A 3-D Multiuser HAP-MIMO Channel Model Based on Dynamic Evolution of LOS Components

A theoretical Three dimensional (3-D) multiuser High altitude platform (HAP) Multipleinput multiple-output (MIMO) channel model based on dynamic evolution of the Line-of-sight (LOS) components is proposed. In this paper, we consider that the LOS components could re-appear after they have vanished, and a two-state Continuous-time Markov chain (CTMC) is used to model the dynamic evolution of the LOS components. The survival probabilities of the LOS components are derived by using Chapman-Kolmogorov (C-K) equations, and the closed-form expressions are derived in this paper. Using the survival probabilities, the spatial correlation functions are derived. Measurements show that a two-state CTMC is indispensable to investigate the dynamic properties of the LOS components.