Full-Duplex UAV Relaying for Multiple User Pairs
Full-Duplex UAV Relaying for Multiple User Pairs
复制标题
多用户对的全双工无人机中继
DOI：
10.1109/jiot.2020.3027621
复制
发表时间：
2021-03-15
影响因子：
10.6
通讯作者：
Yang, Liuqing
中科院分区：
文献类型：
--
作者：
Li, Bing;Zhao, Shengjie;Yang, Liuqing
无人机以其体积小、重量轻、可灵活部署和回收等优点，在军事和民用领域得到了越来越广泛的应用。无人机作为飞行中继器，可以针对不同任务快速建立中继通信链路，增强接收信号功率，增加系统容量，扩大通信覆盖范围。在这篇文章中，我们研究全双工（FD）无人机中继多个源-目的地对。为了充分利用无人机在服务多个源-目的地对的飞行灵活性，我们提出了一种调度协议，利用时分多址（TDMA），以服务不同的源-目的地对轮流飞行时，沿着优化的轨迹。然后，我们进一步制定了基于TDMA的用户调度，动态无人机轨迹，和无人机发射功率的联合优化问题，以最大化系统吞吐量。所制定的问题是非凸的，这使得它很难直接解决，因此，我们提出了一个迭代算法，以获得一个近似的最优解的基础上块坐标下降和连续凸优化技术。仿真结果表明，我们提出的基于FD的无人机中继网络实现了显着的吞吐量增益相比，半双工（HD）的基线，和TDMA为基础的协议优于OFDMA为基础的固定无人机位置/轨迹时，无人机帮助中继信息的多个源-目的地对。
Based on the advantages of small size, lightweight, as well as flexible deployment and recycling, unmanned aerial vehicle (UAV) has been more and more widely used in military and civilian. As flying relays, UAVs can quickly set up relay communication links for different missions, to enhance the receiving signal power, increase the system capacity, and expand the communication coverage. In this article, we investigate full-duplex (FD) UAV relaying for multiple source-destination pairs. To fully exploit the flying flexibility of the UAV in serving multiple source-destination pairs, we propose a scheduling protocol that exploits time-division multiple access (TDMA) to serve different source-destination pairs in turns when flying along an optimized trajectory. Then, we further formulate a joint optimization problem of the TDMA-based user scheduling, the dynamic UAV trajectory, and the UAV transmit power to maximize the system throughput. The formulated problem is nonconvex that makes it difficult to solve directly, hence we propose an iterative algorithm to obtain an approximate optimal solution based on block coordinate descent and successive convex optimization techniques. Simulation results demonstrate that our proposed FD-based UAV relaying network achieves significant throughput gains compared with the half-duplex (HD) baseline, and the TDMA-based protocol outperforms the OFDMA-based ones with fixed UAV position/trajectory when the UAV helps relay information for multiple source-destination pairs.