论文标题
启用UXNB的无细胞大型MIMO，具有HAPS辅助子THZ回程
UxNB-Enabled Cell-Free Massive MIMO with HAPS-Assisted Sub-THz Backhauling
论文作者
论文摘要
在本文中，我们提出了一个无细胞的空中媒介（UAV）基站（BSS），以管理陆地用户与相邻细胞无人机之间的严重间间干扰。由于无细胞的方案需要巨大的带宽进行回程，因此我们建议使用Sub-Terahertz（sub-Thz）频段进行UAV-BSS和中央处理单元（CPU）之间的回程链接。另外，由于Sub-Thz频段需要一个可靠的视线链接，因此我们建议将高海拔平台站（HAP）用作CPU。在提出的方案的首次插槽中，用户将其消息发送给US-6 GHz频段的无人机。然后，无人机应用匹配过滤和电源分配。在第二个插槽中，在每个无人机上，为Sub-Thz频段的每个用户分配正交资源块，并且在模拟波束成形后将信号发送到HAP。在HAP接收器中，模拟波束成形后，每个用户的消息被解码。我们制定了一个优化问题，该问题通过找到最佳分配功率以及无人机的最佳位置来最大化用户的最小信噪比加上噪声比率。模拟结果证明了与空中细胞和无细胞基线方案相比，该方案的优越性。
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.
