I/Q不平衡下CR-RSMA网络中断性能分析  

Outage Performance in CR-RSMA Networks under I/Q Imbalance

作　　者：尹沛桐 班嘉阳 叶迎晖[2] 卢光跃[2] YIN Peitong;BAN Jiayang;YE Yinghui;LU Guangyue(State Key Laboratory of Rail Transit Engineering Informatization(FSDI),Xi̓an 710043,China;Shaanxi Information Communication Network and Security Laboratory,Xi̓an University of Posts and Telecommunications,Xi̓an 710121,China)

机构地区：[1]轨道交通工程信息化国家重点实验室(中铁一院),西安710043 [2]西安邮电大学陕西省信息通信网络及安全重点实验室,西安710121

出　　处：《电讯技术》2024年第12期2060-2066,共7页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(62201451);中铁一院科研项目(2022KY52ZD(ZNXT)-03)。

摘　　要：在实际的认知无线电速率分割多址(Cognitive Radio-Rate-Splitting Multiple Access,CRRSMA)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。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 transceivers̓in-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 user̓s 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.

关 键 词：认知无线电 速率分割多址 I/Q不平衡 中断概率 

分 类 号：TN925[电子电信—通信与信息系统]