UxNB使能的以HAPS辅助的亚太赫兹回程的无小区大规模MIMO
UxNB-Enabled Cell-Free Massive MIMO with HAPS-Assisted Sub-THz Backhauling
AI总结：
本文提出一种UxNB使能的无小区大规模MIMO方案，利用HAPS辅助的亚太赫兹回程，通过优化功率与无人机位置最大化最小信干噪比，仿真验证其优于现有基线方案。
摘要：
本文提出了一种用于无人机基站的无小区方案，以管理地面用户与相邻小区无人机基站之间的严重小区间干扰。由于无小区方案需要巨大的回程带宽，我们提出在无人机基站与中央处理单元之间的回程链路上使用亚太赫兹频段。此外，由于亚太赫兹频段需要可靠的视距链路，我们提出使用高空平台站作为中央处理单元。在所提方案的第一时隙，用户以sub-6 GHz频段将消息发送给无人机。随后，无人机应用匹配滤波和功率分配。在第二时隙，在每个无人机处，在亚太赫兹频段为每个用户分配正交资源块，并在模拟波束成形后将信号发送至高空平台站。在高空平台站接收机中，经模拟波束成形后，解码每个用户的消息。我们构建了一个优化问题，通过寻找最优分配功率以及无人机的最优位置，来最大化用户的最小信干噪比。仿真结果证明了所提方案相较于空中蜂窝和地面无小区基线方案的优越性。
英文摘要：
In this paper, we propose a cell-free scheme for unmanned aerial vehicle (UAV) base stations (BSs) to manage the severe intercell interference between terrestrial users and UAV-BSs of neighboring cells. Since the cell-free scheme requires enormous bandwidth for backhauling, we propose to use the sub-terahertz (sub-THz) band for the backhaul links between UAV-BSs and central processing unit (CPU). Also, because the sub-THz band requires a reliable line-of-sight link, we propose to use a high altitude platform station (HAPS) as a CPU. At the first time-slot of the proposed scheme, users send their messages to UAVs at the sub-6 GHz band. The UAVs then apply match-filtering and power allocation. At the second time-slot, at each UAV, orthogonal resource blocks are allocated for each user at the sub-THz band, and the signals are sent to the HAPS after analog beamforming. In the HAPS receiver, after analog beamforming, the message of each user is decoded. We formulate an optimization problem that maximizes the minimum signal-to-interference-plus-noise ratio of users by finding the optimum allocated power as well as the optimum locations of UAVs. Simulation results demonstrate the superiority of the proposed scheme compared with aerial cellular and terrestrial cell-free baseline schemes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
