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High-Altitude Platforms (HAPs) are one of the most promising alternative infrastructures for realizing next generation mobile communications networks. This paper utilizes a recently proposed Three-Dimensional (3-D) reference Multiple-Input Multiple-Output (MIMO) channel model for HAPs and investigates the capacity of spatially and temporally correlated HAP-MIMO channels. The effect of several parameters, such as the elevation angle of the platform, the configuration and displacement of the antenna arrays, the Doppler spread, and the 3-D non-uniform distribution of the local scatterers, on the capacity is studied.
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