This paper considers the performance of non-orthogonal multiple-access (NOMA) with full-duplex (FD) relaying system in the presence of two practical undesirable defects, namely channel estimation error (CEE) and in-phase/quadrature-phase imbalance (IQI). Specifically, in the proposed NOMA with FD relaying system, the exact expressions of outage probability (OP) for the considered two users have been derived firstly. Then, the corresponding optimal power allocation coefficients for minimizing the OP of the dual users are obtained. Finally, the approximate expression of the ergodic sum rate (ESR) for the system is presented. Simulation results demonstrate that: (1) NOMA with FD relaying system can achieve superior outage performance in comparison with NOMA with Half-duplex (HD) relaying system at low Signal-to-noise ratio (SNR), but the circumstance is exactly the opposite at high SNR; (2) IQI and CEE would result in performance degradation, and must be seriously considered while designing NOMA with FD relaying systems.

本文考虑了在存在两个实际不良缺陷，即信道估计误差 (CEE) 和同相/正交相位不平衡时，全双工 (FD) 中继系统的非正交多址 (NOMA) 的性能智商）。具体来说，在提出的带有 FD 中继系统的 NOMA 中，首先推导出了所考虑的两个用户的中断概率（OP）的精确表达式。然后，得到相应的最小化双用户OP的最优功率分配系数。最后，给出了系统遍历求和率（ESR）的近似表达式。仿真结果表明：(1) 与采用半双工 (HD) 中继系统的 NOMA 相比，采用 FD 中继系统的 NOMA 可以在低信噪比 (SNR) 下实现卓越的中断性能，但在高 SNR 时情况正好相反；(2) IQI 和 CEE 会导致性能下降，在设计具有 FD 中继系统的 NOMA 时必须认真考虑。