支持多个多播组业务的多中继协作NOMA系统中断性能研究  

Outage performance of multi-relay collaborative NOMA systems supporting multiple multicast services

作　　者：褚翼飞 杨新杰 CHU Yifei;YANG Xinjie(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《电信科学》2023年第7期35-45,共11页Telecommunications Science

基　　金：国家重点实验室开放基金资助项目(No.SKLNST-2021-1-12);宁波市自然科学基金资助项目(No.2019A610073)。

摘　　要：提出在协作非正交多址接入(non-orthogonal multiple access,NOMA)系统中使用多中继方案支持主用户和多个多播组业务。考虑在瑞利信道下,从每个多播组中选出信道条件最好的次级用户作为中继节点协助解码转发目标单播主用户的信号,在主用户处使用最大比合并(maximum ratio combining,MRC)技术以提升信干噪比(signal to interference and noise ratio,SINR)。分别对全双工和半双工模式下应用多中继同时转发(multi-relay simultaneous forwarding,MRSF)和最优中继转发(optimal relay forwarding,ORF)两种策略的主用户中断概率进行理论分析并通过蒙特卡洛仿真验证。结果显示,全双工对半双工中继具有性能优势,并发现对相同个数多播组,MRSF策略相比ORF策略可有效提升单播主用户的中断性能且随多播组个数增加变得更显著。A cooperative non-orthogonal multiple access(NOMA)system was proposed to support unicast primary user and multiple multicast services based on multiple relays strategy.Under the Rayleigh channel,the secondary us-er with the best channel condition from each multicast group was selected as full-duplex relay to decode and forward the unicast primary user’s signal,and the primary user employed the maximum ratio combining(MRC)technique to improve the signal to interference and noise ratio(SINR).The closed-form expressions for the outage probability of primary user in full-duplex and half-duplex modes with multi-relay simultaneous forwarding(MRSF)and optimal relay forwarding(ORF)were derived and verified by Monte Carlo simulations.The results verify that full-duplex re-lay outperforms half-duplex relay scheme.Furthermore,with same number of multicast groups,the MRSF strategy effectively improve the unicast primary user outage performance,in comparison with ORF strategy,when the number of multicast groups increases,the improvement becomes more significant.

关 键 词：非正交多址接入 多播业务 全双工多中继 中断概率 

分 类 号：TN925[电子电信—通信与信息系统]