3D Time-Varying UAV-Based Channel Model for THz Air-to-Air Wireless Communications

In this paper, a three-dimensional (3D) time-varying channel model is proposed for unmanned aerial vehicles (UAVs) air-to-air (A2A) wireless channels based on geometric channel model theory in terahertz (THz) band. In this proposed channel model, the scattering fading and reflection fading on rough surfaces of propagation environments, and the atmospheric molecules absorption attenuations are considered in THz band. Moreover, the statistical properties of the proposed channel model, including path loss, time autocorrelation function (T-ACF) and Doppler power spectrum density (PSD), have been derived and analyzed with the several important UAV-related parameters and different carrier frequencies (i.e. millimeter wave (mm-wave) and THz bands). Finally, the correctness of the proposed channel model has been verified via simulation, and some useful observations are provided for the system design of THz UAV-based A2A wireless communication systems.