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This paper studies unmanned aerial vehicle (UAV) aided wireless communicationsystems where a UAV supports uplink communications of multiple ground nodes(GNs) while flying over the area of the interest. In this system, thepropulsion energy consumption at the UAV is taken into account so that theUAV's velocity and acceleration should not exceed a certain threshold. Weformulate the minimum average rate maximization problem and the energyefficiency (EE) maximization problem by jointly optimizing the trajectory,velocity, and acceleration of the UAV and the uplink transmit power at the GNs.As these problems are non-convex in general, we employ the successive convexapproximation (SCA) techniques. To this end, proper convex approximations forthe non-convex constraints are derived, and iterative algorithms are proposedwhich converge to a local optimal point. Numerical results demonstrate that theproposed algorithms outperform baseline schemes for both problems. Especiallyfor the EE maximization problem, the proposed algorithm exhibits about 109 %gain over the baseline scheme.

UAV-Aided Wireless Communication Designs With Propulsion Energy Limitations