论文标题
航空网络中的多次访问：从正交和非正交到速率分类
Multiple Access in Aerial Networks: From Orthogonal and Non-Orthogonal to Rate-Splitting
论文作者
论文摘要
最近，人们引起了人们对无人驾驶汽车（UAV）利用的兴趣。具体而言，无人机可以在蜂窝网络中用作空中用户，以用于交付，监视，救援搜索或作为空中基站（ABS），以与偏远发现的区域或密集的环境中的地面用户进行通信，或者需要迅速高容量。为了满足无线航空网络的高度要求，已经研究了几种多个访问技术。特别是，空间分割多重访问（SDMA）和功率域非正交多访问（NOMA）呈现出有希望的多路复用增长，用于航空链路和上行链路。然而，这些收益取决于环境条件，因此受到限制。因此，最近提出了一种广泛的方案，称为速率分解多重访问（RSMA），与SDMA和NOMA相比，它能够实现更好的光谱效率提高。在本文中，我们对空中网络采用的关键多重访问技术进行了全面的调查，该技术将部署ABS为地面用户提供服务。由于仅报告了关于RSMA在空中系统中使用的零星结果，因此我们旨在通过对基于RSMA的ABS提供的两用户下链接网络的加权总和率进行建模和分析来扩展有关此主题的讨论。最后，相关的开放问题和未来的研究方向暴露了。
Recently, interest on the utilization of unmanned aerial vehicles (UAVs) has aroused. Specifically, UAVs can be used in cellular networks as aerial users for delivery, surveillance, rescue search, or as an aerial base station (aBS) for communication with ground users in remote uncovered areas or in dense environments requiring prompt high capacity. Aiming to satisfy the high requirements of wireless aerial networks, several multiple access techniques have been investigated. In particular, space-division multiple access(SDMA) and power-domain non-orthogonal multiple access (NOMA) present promising multiplexing gains for aerial downlink and uplink. Nevertheless, these gains are limited as they depend on the conditions of the environment. Hence, a generalized scheme has been recently proposed, called rate-splitting multiple access (RSMA), which is capable of achieving better spectral efficiency gains compared to SDMA and NOMA. In this paper, we present a comprehensive survey of key multiple access technologies adopted for aerial networks, where aBSs are deployed to serve ground users. Since there have been only sporadic results reported on the use of RSMA in aerial systems, we aim to extend the discussion on this topic by modelling and analyzing the weighted sum-rate performance of a two-user downlink network served by an RSMA-based aBS. Finally, related open issues and future research directions are exposed.
