This article considers millimeter-wave (mmWave) communications in a full-duplex (FD) unmanned aerial vehicle (UAV) system with multiple non-orthogonal multiple access (NOMA) users. In particular, a UAV operates in an FD transmission mode and acts as a decode-and-forward (DF) relay to aid communications between a ground base station and multiple ground users. Unlike previous works on the UAV-aided NOMA systems, where the specific carrier frequencies are often ignored, this work investigates the effect of a specific carrier frequency in the mmWave band and the channel model proposed for the fifth and beyond generations (5G and B5G) of mobile communications. The closed-form expressions of outage probability (OP) and achievable data rate (ADR) of the FD-UAV-NOMA system with mmWave communications (called as the MW-FD-UAV-NOMA system) are successfully derived over Nakagami-$m$ fading channels. Numerical results clearly indicate the strong effects of the residual self-interference (RSI), high frequency, far distances between transmitters and receivers, wide bandwidth, and the altitude of the UAV on the OP and ADR of the MW-FD-UAV-NOMA system. Since the mmWave communications are used, an increase in the frequency, distances, bandwidth, and/or altitude of the UAV will significantly reduce the performance of the MW-FD-UAV-NOMA system. Importantly, when the UAV flies nearer the base station, the performance of the MW-FD-UAV-NOMA system can be better than when the UAV flies nearer the users. Finally, the exactness of the obtained expressions is confirmed via Monte-Carlo simulations.

本文考虑了具有多个非正交多址 (NOMA) 用户的全双工 (FD) 无人机 (UAV) 系统中的毫米波 (mmWave) 通信。具体而言，无人机在 FD 传输模式下运行，并充当解码转发 (DF) 中继，以帮助地面基站与多个地面用户之间的通信。与以往的无人机辅助 NOMA 系统工作不同，在这些工作中，特定的载波频率通常被忽略，这项工作研究了特定载波频率在毫米波频段中的影响以及为第五代及以后（5G 和 B5G）提出的信道模型的移动通信。$米$衰落的频道。数值结果清楚地表明了残余自干扰 (RSI)、高频、发射器和接收器之间的远距离、宽带宽以及无人机的高度对 MW-FD-UAV-NOMA 的 OP 和 ADR 的强烈影响系统。由于使用毫米波通信，无人机的频率、距离、带宽和/或高度的增加将显着降低 MW-FD-UAV-NOMA 系统的性能。重要的是，当无人机飞得更靠近基站时，MW-FD-UAV-NOMA 系统的性能可以比无人机飞得更靠近用户时更好。最后，通过蒙特卡罗模拟证实了所获得表达式的准确性。