In this letter, we study an unmanned aerial vehicle (UAV)-aided non-orthogonal multiple access (NOMA) multi-way relaying networks (MWRNs). Multiple terrestrial users aim to exchange their mutual information via an amplify-and-forward (AF) UAV relay. Specifically, the realistic assumption of the residual hardware impairments (RHIs) at the transceivers is taken into account. To evaluate the performance of the considered networks, we derive the analytical expressions for the achievable sum-rate (ASR). In addition, we carry out the asymptotic analysis by invoking the affine expansion of the ASR in terms of high signal-to-noise ratio (SNR) slope and high SNR power offset. Numerical results show that: 1) Compared with orthogonal multiple access (OMA), the proposed networks can significantly improve the ASR since it can reduce the time slots from [( ${M}-1)/2] + 1$ to 2; and 2) RHIs of both transmitter and receiver have the same effects on the ASR of the considered networks.

中文翻译：

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具有残余硬件损伤的无人机辅助多路 NOMA 网络

在这封信中，我们研究了无人机 (UAV) 辅助的非正交多址 (NOMA) 多路中继网络 (MWRN)。多个地面用户旨在通过放大转发 (AF) 无人机中继交换他们的相互信息。具体而言，考虑了收发器处残余硬件损伤 (RHI) 的现实假设。为了评估所考虑网络的性能，我们推导出可实现总和率 (ASR) 的解析表达式。此外，我们通过在高信噪比 (SNR) 斜率和高 SNR 功率偏移方面调用 ASR 的仿射展开来进行渐近分析。数值结果表明： 1）与正交多址（OMA）相比，所提出的网络可以显着提高 ASR，因为它可以将时隙从 [( ${M}-1)/2] + 1$ 减少到 2；2) 发射机和接收机的 RHI 对所考虑网络的 ASR 具有相同的影响。