A Space-Time Correlation Model for UAV-Based Terahertz MIMO Wireless Channels

In this paper, a space-time correlation model is proposed for unmanned aerial vehicle-based (UAV-based) THz multiple-input multiple-output (MIMO) wireless channels. This model considers not only the scattering and reflection fading on rough surface, but also the atmospheric absorption attenuation, the random deployment and arbitrary trajectory of UAV, antenna arrays of transmitter (Tx) and receiver (Rx). Furthermore, the statistical properties of this model, i.e. time auto-correlation function (T-ACF) and space cross-correlation function (S-CCF), are derived and thoroughly analyzed with several important UAV-related parameters and different carrier frequencies. Finally, the simulated results and corresponding theoretical ones match well, which shows the correctness of the proposed model.