The paper studies the impact of in-phase and quadrature-phase imbalance (IQI) on the performance of cooperative non-orthogonal multiple access (NOMA) systems over Beaulieu–Xie fading channels. In the presence of an eavesdropper, the information is decoded-and-forward to the legitimate users at the relay, and the successful interference cancellation technology is utilized at the receiving end to eliminate the interference between the far and the near users. The closed-form expressions of outage probability (OP) and intercept probability (IP) are deduced to investigate the reliability and security. Moreover, the asymptotic expressions of OP for high signal-to-noise ratio are obtained. Finally, Monte Carlo simulations coincide perfectly with the results of theoretical derivation, which verifies the correctness of the analysis. The interesting results are that the presence of IQI reduces reliability but increases security. In addition, the increase of the target rate and the decrease of the channel parameter $m$ can weaken the reliability.

本文研究了同相和正交相位不平衡 (IQI) 对 Beaulieu-Xie 衰落信道上协作非正交多址 (NOMA) 系统性能的影响。在存在窃听者的情况下，信息在中继处被解码并转发给合法用户，并在接收端利用成功的干扰消除技术消除远近用户之间的干扰。推导了中断概率（OP）和截获概率（IP）的封闭式表达式来研究可靠性和安全性。此外，得到了高信噪比的OP的渐近表达式。最后，蒙特卡罗模拟与理论推导结果完全吻合，验证了分析的正确性。有趣的结果是，IQI 的存在降低了可靠性，但增加了安全性。此外，目标速率的增加和通道参数的减少$米$会削弱可靠性。