This letter investigates an overlay cognitive Alamouti’s space-time block code-aided non-orthogonal multiple access (STBC-NOMA) system. Approximate closed-form expressions for the system throughput (ST) and the outage probability (OP) of both the primary and secondary networks under imperfect successive interference cancellation (SIC) are derived over Rayleigh fading channels. Moreover, asymptotic expressions of the ST and OP at high signal-to-noise ratio (SNR) regime are also evaluated. It is shown that the proposed system outperforms the system presented by Liping et al. (2020), in terms of both the ST and OP. The letter further investigates the impact of power allocation coefficients on the OP.

中文翻译：

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具有不完善SIC的重叠认知STBC-NOMA系统的中断性能

这封信调查了覆盖认知 Alamouti 的时空块代码辅助非正交多路访问 (STBC-NOMA) 系统。系统吞吐量 (ST) 和主次网络在不完美连续干扰消除 (SIC) 下的系统吞吐量 (ST) 和中断概率 (OP) 的近似闭式表达式是通过瑞利衰落信道导出的。此外，还评估了 ST 和 OP 在高信噪比 (SNR) 状态下的渐近表达式。结果表明，所提出的系统优于 Liping 提出的系统等。(2020)，就 ST 和 OP 而言。这封信进一步调查了权力分配系数对 OP 的影响。