Spectral Efficiency of Multi-Pair mMIMO-NOMA UAV-Relaying with Low-Resolution ADCs/DACs

In this paper, we propose an unmanned aerial ve-hicle (UAV)-enabled massive multiple-input multiple-out (MIMO) non-orthogonal multiple access (NOMA) full-duplex (FD) two-way relay (TWR) system with low resolution analog-to-digital converters/digital-to-analog converters (ADCs/DACs) architecture. By adopting the additive quantization noise model (AQNM), the spectral efficiency (SE) with imperfect channel state information (CSI), imperfect successive interference cancellation (SIC) and low-precision ADCs/DACs is studied. To evaluate the system SE performance, some asymptotic analyses are presented. Simulation results verify the accuracy of theoretical derivations and illus-trate that with low-resolution ADC/DAC architecture, the SE of proposed massive MIMO-NOMA FD TWR system outperforms the corresponding OMA and/or HD system. In addition, the SE loss due to interference and noise can be compensated by utilizing massive MIMO. We also confirm that the impact of ADCs/DACs can be effectively mitigated by adjusting UAV altitude and employing more antennas at the UAV.