A 3-D Wideband Model Based on Dynamic Evolution of Scatterers for HAP-MIMO Channel

A theoretical 3-D wideband model based on the dynamic evolution of scatterers for high altitude platform multiple-input multiple-output channel is proposed. In this letter, we consider the dynamic properties of scatterers that scatterers could re-appear after they have vanished, and an M-step, two-state Markov process is used to model the dynamic evolution of scatterers. The Chapman-Kolmogorov equations are used to derive the survival probabilities of scatterers and the complexity is reduced by using eigenvalue decomposition. The spacetime-frequency correlation function is derived, and numerical results show that an M-step Markov process is indispensable to investigate the dynamic properties of scatterers.