| 两阶段中继选择策略下SWIPT-CR-NOMA网络的中断性能分析 |
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| 引用本文： | 乔宇航,贺玉成,张良梅,周林.两阶段中继选择策略下SWIPT-CR-NOMA网络的中断性能分析[J].信号处理,2021,37(1):40-48. |
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| 作者姓名： | 乔宇航 贺玉成 张良梅 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： | 针对采用无线携能传输(SWIPT)的多中继协作底层认知NOMA网络，提出一种基于NOMA和串行干扰消除协议的两阶段中继选择策略(TSRS)，次级网络源节点和所选中继采用相同的功率分配生成多用户叠加信号，中继只利用采集能量提供解码转发服务。推导了用户中断概率的闭合表达式，进行了蒙特卡洛仿真验证，分析了功率分配因子、能量分裂参数、干扰温度限和中继数量等系统参数对中断性能的影响。仿真结果表明，所提方案可显著提升协作系统中断性能。
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| 关 键 词： | 认知无线电 中继选择 非正交多址接入 无线信息与功率传输 中断概率 |
| 收稿时间： | 2020-10-08 |
Outage Performance Analysis of Two-Stage Relay Selection for SWIPT-CR-NOMA Networks |
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| Affiliation: | Xiamen Key Laboratory of Mobile Multimedia Communications, Huaqiao University |
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| Abstract: | For underlay non-orthogonal multiple access (NOMA) cognitive networks using simultaneous wireless information and power transmission (SWIPT), a two-stage relay selection strategy (TSRS) based on NOMA and successive interference cancellation protocols is proposed. The source node and the selected relay of the secondary network both generate multiuser superimposed signals using the same power allocation. The relays use only the harvested energy to provide de-code-and-forward services. The closed-form expressions for users’ outage probabilities are derived and verified by Monte Carlo simulations. The influences of system parameters such as power allocation factor, energy splitting parameter, interfer-ence temperature constraint, and the number of relays on the outage performance is analyzed. Simulation results show that the proposed scheme can significantly improve the outage performance of the system. |
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