Trajectory Optimization and Power Allocation for UAV Alternate Relay Communications
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摘要: 为了提高无人机中继通信系统的频谱利用率，该文提出一种交替中继方法，通过两个无人机中继交替工作，轮流将信息从源端转发到目的端。研究联合优化无人机中继的飞行轨迹和各发射端的发射功率，协调两条中继链路的相互干扰，实现端到端的吞吐量最大化。涉及的优化问题受限于无人机的高度约束、机动约束、防碰撞约束以及各发射端的平均与峰值发射功率约束，是难以求得最优解的非凸优化问题。该文提出一种基于交替最大化和连续凸优化技术的高效迭代算法求解次优解，并用计算机仿真验证了所提算法的有效性。Abstract: To improve the spectrum efficiency of the Unmanned Aerial Vehicle (UAV) relaying communication systems, a UAV alternate relay scheme is proposed, where two UAV relays alternately forward information from the source to the destination. To coordinate the interference among the two relaying data links, UAV trajectory and transmit power are investigated to maximize the end-to-end throughput of the UAV alternate relay system. The considered optimization problem is subject to the height, maneuver and collision avoidance constraints of the UAVs and the average and peak transmit power constraints of the source and UAV relays, which is non-convex and difficult to obtain the optimal solution. Nevertheless, an efficient iterative algorithm based on the alternating maximization and successive convex optimization techniques is proposed to obtain a suboptimal solution. Simulation results verify the effectiveness of the proposed algorithm.
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