Cell-Free UAV Networks With Wireless Fronthaul: Analysis and Optimization
Cell-Free UAV Networks With Wireless Fronthaul: Analysis and Optimization
复制标题
具有无线前传的无蜂窝无人机网络：分析和优化
DOI：
10.1109/twc.2023.3294908
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发表时间：
2024-03
影响因子：
10.4
通讯作者：
Carles Diaz-Vilor;A. Lozano;H. Jafarkhani
中科院分区：
文献类型：
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作者：
Carles Diaz-Vilor;A. Lozano;H. Jafarkhani
在无蜂窝网络中使用无人机（UAV）将为进一步改善无线网络带来许多新的机会。然而，无蜂窝UAV网络提出了与接入和前传链路的无线性质相关的主要挑战。这篇手稿研究了无蜂窝系统的上行链路，其中用户连接到无人机，后者设备通过不完善的无线前传链路将信息转发到处理点。针对前传考虑三种多址接入备选方案，即频分多址接入、空分多址接入及其组合。根据这些前传方案和最小均方误差接收的频谱效率的确定性等效表达式。然后，（a）无人机的三维部署，（B）用户发射功率，（c）无人机发射功率的优化子问题进行了研究。这些子问题的联合优化产生了上级性能，其中3D部署是改进的主要来源。
The use of uncrewed aerial vehicles (UAVs) in cell-free networks is poised to unleash a number of new opportunities to further improve wireless networks. However, cell-free UAV networks present major challenges related to the wireless nature of access and fronthaul links. This manuscript studies the uplink of cell-free systems where users connect to UAVs, the latter devices forwarding the information to a processing point through imperfect wireless fronthaul links. Three multiple access alternatives are considered for the fronthaul, namely frequency division multiples access, spatial division multiple access, and combinations thereof. Deterministic equivalent expressions for the spectral efficiency under these fronthaul schemes and minimum mean-square error reception are derived. Then, the optimization subproblems of (a) the 3D deployment of the UAVs, (b) the user transmit powers, and (c) the UAV transmit powers, are investigated. The joint optimization of these subproblems yields superior performance, with the 3D deployment being the main source of improvement.