Recently, unmanned aerial vehicle (UAV) has attracted much attention due to its flexible deployment and controllable mobility. As the general communication network cannot meet the emergency requirements, in this paper we study the multi-UAV enabled wireless emergency communication system. Our goal is to maximize the capacity with jointly optimizing trajectory and allocating power. To tackle this non-convex optimization problem, we first decompose it into two sub-problems to optimize the trajectory and power allocation, respectively. Then, we propose the successive convex approximation technique and the block coordinate update algorithm to solve the two subproblems. The approximate optimal solution can be obtained after continuous iterations. Simulation results show that the capacity can be greatly increased using our proposed joint trajectory optimization and power allocation.

翻译：近年来，无人机因其灵活的部署方式和可控的机动性而备受关注。由于常规通信网络无法满足应急需求，本文研究了多无人机使能的无线应急通信系统。我们的目标是通过联合优化轨迹和分配功率来最大化系统容量。为处理这一非凸优化问题，我们首先将其分解为分别优化轨迹和功率分配的两个子问题。随后，我们提出采用逐次凸逼近技术和块坐标更新算法来求解这两个子问题。通过连续迭代可获得近似最优解。仿真结果表明，采用本文提出的联合轨迹优化与功率分配方案可显著提升系统容量。