Joint Trajectory Design, Tx Power Allocation, and Rx Power Splitting for UAV-Enabled Multicasting SWIPT Systems

This article studies a joint resource allocation for an unmanned aerial vehicle (UAV) enabled simultaneous wireless information and power transfer (SWIPT) system in a multicasting scenario, where a UAV is dispatched to simultaneously send common information and wireless power to multiple users on the ground while the users decode information and harvest energy based on the power splitting (PS) receiver architecture. In this system, we aim to maximize the minimum achievable rate among all users under their harvested energy constraints by optimizing trajectory and transmit power of the UAV jointly with PS ratios of the users. To solve this challenging nonconvex problem, we first convert it into a more tractable form by exploiting the quadratic transform technique. Then, we propose an efficient iterative algorithm for the joint optimization. Numerical results show that the proposed scheme outperforms baseline schemes.