Modeling and Simulation of 3-D Wideband HAP-MIMO Channels

High-altitude platforms (HAPs) are considered as an alternative technology for next generation broadband wireless communications. This paper proposes three- dimensional (3-D) sum-of-sinusoids (SoS) simulation models for wideband HAP multiple-input-multiple- output (MIMO) channels. The starting point of the design procedure is a non-realizable reference model. The performance of the proposed models is studied in terms of the space-time-frequency correlation function (STFCF). The results show that the simulation models approximate the reference model with high precision.