Non-orthogonal multiple access (NOMA) is envisioned as a promising technology that enhances the spectrum efficiency for future cellular networks. On the other hand, there is a growing interest in wireless powered sensor networks toward the sustainable realization of Internet of Things (IoT), as they may not require any battery replacement in principle. Moreover, the use of unmanned aerial vehicle (UAV) as a moving access point or base station has emerged as a potential solution to the high traffic demands of wireless networks. This article focuses on the UAV-aided data collection from multiple wireless powered sensor nodes, where a single-antenna UAV supplies all the sensor nodes located in the coverage area with energy for data transmission, with which the sensor nodes send back their information to the UAV. We study several transmission schemes including NOMA as well as cooperative relaying, together with two representative sensor node pairing strategies. Based on the theoretical analysis in terms of the achievable outage probabilities as well as the corresponding numerical results, we elucidate suitable node pairing strategies that depend on selected transmission schemes.

中文翻译：

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基于NOMA和高度优化协同中继的支持无人机的无线供电传感器网络

非正交多路访问（NOMA）被认为是一种有前途的技术，可以增强未来蜂窝网络的频谱效率。另一方面，无线传感器网络对物联网（IoT）的可持续实现越来越感兴趣，因为它们原则上可能不需要更换电池。此外，使用无人飞行器（UAV）作为移动接入点或基站已经成为解决无线网络高流量需求的潜在解决方案。本文着重于从多个无线传感器节点进行的无人机辅助数据收集，其中单天线无人机为覆盖区域内的所有传感器节点提供能量以进行数据传输，传感器节点通过这些数据将其信息发送回无人机 我们研究了包括NOMA以及协作中继在内的几种传输方案，以及两种代表性的传感器节点配对策略。基于可实现的中断概率的理论分析以及相应的数值结果，我们阐明了取决于所选传输方案的合适节点配对策略。