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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不完善SIC覆盖认知STBC-NOMA系统的停电性能研究


这封信研究了覆盖认知 Alamouti 的时空分组码辅助非正交多址 (STBC-NOMA) 系统。在瑞利衰落信道上导出了不完美连续干扰消除（SIC）下主网络和次网络的系统吞吐量（ST）和中断概率（OP）的近似封闭式表达式。此外，还评估了高信噪比 (SNR) 状态下 ST 和 OP 的渐近表达式。结果表明，所提出的系统优于 Liping 等人提出的系统。 （2020），就 ST 和 OP 而言。该信进一步调查了功率分配系数对OP的影响。