| 两级中继选择的协作CR-NOMA网络性能分析 |
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| 引用本文： | 乔宇航,贺玉成,杨键泉,周林.两级中继选择的协作CR-NOMA网络性能分析[J].信号处理,2020,36(2):196-202. |
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| 作者姓名： | 乔宇航 贺玉成 杨键泉 周林 |
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| 作者单位： | 华侨大学厦门市移动多媒体通信重点实验室 |
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| 基金项目： | 福建省自然科学基金(2018J01096);华侨大学研究生科研创新能力培育计划资助项目(18013082031);重庆市/信息产业部“计算机网络与通信技术重点实验室”开放基金(CY-CNCL-2017-05)。 |
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| 摘 要： | 本文研究了中继选择方案对协作下认知非正交多址（CR-NOMA）网络中断性能的影响，提出了一种两级中继选择方案。第一时隙在保证主用户服务质量的基础上，次级网络源节点向认知中继集群广播叠加信号。第二时隙认知中继提供解码转发服务，协助源节点传输信息。基于上述假设，推导了次级用户中断概率的闭合表达式并给出了分析结果。证明相比于部分中继选择策略，两级中继选择策略可以达到更好的中断性能和更大的分集增益。同时本文的分析结果验证了备选中继节点数目和功率分配因子对系统中断性能的影响，蒙特卡罗仿真验证了理论结果。
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| 关 键 词： | 非正交多址 认知无线电 中继选择 中断概率 |
| 收稿时间： | 2019-11-21 |
Performance Analysis for Cooperative CR-NOMA with Two-Stage Relay Selection |
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| Qiao Yuhang,He Yucheng,Yang Jianquan,Zhou Lin.Performance Analysis for Cooperative CR-NOMA with Two-Stage Relay Selection[J].Signal Processing,2020,36(2):196-202. |
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| Authors: | Qiao Yuhang He Yucheng Yang Jianquan Zhou Lin |
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| Affiliation: | Xiamen Key Laboratory of Mobile Multimedia Communications, Huaqiao University |
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| Abstract: | This paper studied the impact of relay selection scheme on the outage performance of cognitive non-orthogonal multiple access(CR-NOMA) networks.A two-stage relay selection scheme is proposed.In the first time slot,on the basis of ensuring the quality of service of the primary user,the source broadcasts the superimposed signal to the cognitive relay cluster.In the second time slot,decode and-forward(DF) protocol is used at the selected relay to assist simultaneous transmission from the source to destination users.Based on the above assumptions,the closed expression of the secondary user outage probability is derived and the analysis results are given.It is proved that the two-stage relay selection strategy can achieve better outage performance and greater diversity gain than partial relay selection strategy.At the same time,the analysis results verify the influence of the number of alternate relay nodes and the power allocation factor on the system outage performance.The Monte Carlo simulation verified the theoretical results. |
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| Keywords: | non-orthogonal multiple access cognitive radio relay selection outage probability |
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