| 摘要: |
| 在实际的认知无线电速率分割多址(Cognitive Radio-Rate-Splitting Multiple Access,CR-RSMA)通信网络中，射频收发机I/Q支路的幅值与相位通常不平衡。然而，已有关于CR-RSMA网络的研究均忽略了这一事实，导致I/Q不平衡对CR-RSMA网络的影响机理尚不清晰。为此，针对存在I/Q不平衡的CR-RSMA网络，在保障主用户传输性能的前提下，次用户根据干扰门限和自身增益进行自适应速率分割，以实现所允许的传输速率。为了量化分析各传输参数对中断性能的影响，以中断概率作为衡量整个网络中断性能的指标，推导了给定幅值和相位下的中断概率封闭表达式。仿真结果表明，I/Q不平衡会引入更多的干扰导致用户中断性能降低；相对于幅度失配，相位失配会导致更高的系统中断概率。 |
| 关键词: 认知无线电 速率分割多址 I/Q不平衡 中断概率 |
| DOI：10.20079/j.issn.1001-893x.231004001 |
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| 基金项目:国家自然科学基金资助项目(62201451);中铁一院科研项目(2022KY52ZD(ZNXT)-03) |
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| Outage Performance in CR-RSMA Networks under I/Q Imbalance |
| YIN Peitong,BAN Jiayang,YE Yinghui,LU Guangyue |
| (1.State Key Laboratory of Rail Transit Engineering InformatizationFSDI,Xi揳n 710043,China;2.Shaanxi Information Communication Network and Security Laboratory,Xi揳n University of Posts and Telecommunications,Xi揳n 710121，China) |
| Abstract: |
| In practical cognitive radio-based rate splitting multiple access(CR-RSMA) communication networks,there is often an imbalance in the amplitude and phase of the transceivers in-phase/quadrature(I/Q) branches.However,existing research on CR-RSMA networks has largely overlooked this fact,leading to an unclear understanding of the impact of I/Q imbalance on CR-RSMA networks.Motivated by this,the authors consider a CR-RSMA network operating under I/Q imbalance conditions.While ensuring the primary user搒 transmission performance,secondary users adaptively split their rates based on interference thresholds and their own gains to achieve permissible transmission rates.Finally,the authors derive closed-form expressions for the outage probability under given amplitude and phase conditions.Simulation results reveal the following findings:I/Q imbalance introduces additional interference,resulting in degraded user outage performance;compared with amplitude mismatch,phase mismatch leads to a higher probability of system interruption. |
| Key words: cognitive radio rate splitting multiple access I/Q imbalance outage performance |
