Abstract
A 3-D geometry-based stochastic model (GBSM) based on two cylinders is proposed for high altitude platform (HAP) communication systems. The proposed 3-D GBSM uses the volume of inner cylinder to model isotropic scattering environment, and that between the inner cylinder and the outer cylinder to model non-isotropic scattering environment. In this letter, the time-variant parameters, including distances between the scatterers and receiver, azimuth angle of departure, and elevation angle of departure (EAOD), are investigated for HAP multiple-input multiple-output (MIMO) channel. The proposed model is validated by the spatial correlation function of measurement results, and the numerical results also demonstrate that the proposed 3-D GBSM with time-varying parameters is applicable to describe the 3-D HAP-MIMO channel.
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