Energy-Efficient Transmit Power And Straight Trajectory Optimization In Uav-Aided Wireless Sensor Networks

Optimization problem of transmit power and straight trajectory is addressed in unmanned aerial vehicle (UAV) aided wireless sensor networks. To maximize the energy efficiency (EE) performance, we formulate the transmit power and straight trajectory optimization problem as a non-convex optimization and solve it by iterative method. To facilitate the analysis, we derive an analytical expression of upper bound of the aggregated throughput with straight UAV flight. Based on the upper bound, the original optimization problem can be addressed by solving an alternating sequence of trajectory optimization (TO) and power optimization (PO) sub-problems with closed-form expressions. Furthermore, we propose an alternative algorithm for power allocation and straight trajectory optimization problem and analyze the computing complexity. Numerical results show that the proposed method achieves a significant improvement compared to the existing EE schemes.