| D2D辅助的协作中继NOMA系统中TSRS策略及其中断性能分析 |
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| 引用本文： | 吴舒婷,贺玉成,张良梅,周林.D2D辅助的协作中继NOMA系统中TSRS策略及其中断性能分析[J].信号处理,2022,38(5):1001-1008. |
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| 作者姓名： | 吴舒婷 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，福建 厦门 361021 |
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| 基金项目： | 福建省自然科学基金2018J01096 |
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| 摘 要： | 该文研究了D2D辅助的协作中继NOMA（DC-NOMA）网络，在中继用户（RU）转发信息的第二时隙，利用RU到蜂窝中心用户（CCU）的D2D通信链路传输新的信号。为了提高传输可靠性，设计了新的信号检测策略，通过完全利用边缘信息消除了用户间的干扰。基于新的信号检测策略，提出了一种两阶段中继选择策略（TSRS）。在满足蜂窝边缘用户（CEU）可靠接收的中继集合中，选择使CCU成功解码概率最大的中继。为了评估所提出的DC-NOMA方案，推导了每个用户的确切中断概率且通过仿真得到验证。仿真结果表明，在高信噪比区域，该文所提出的基于新的信号检测策略的DC-NOMA在TSRS方案下的中断性能优于部分中继选择方案（PRSS）和传统的DC-NOMA。特别地，增大中继数量可有效提高DC-NOMA系统的中断性能。
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| 关 键 词： | ??:??非正交多址接入 D2D通信 中继选择 中断概率 |
| 收稿时间： | 2021-08-26 |
TSRS Strategy and Outage Performance Analysis of D2D Aided Cooperative Relaying NOMA System |
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| Affiliation: | Xiamen Key Laboratory of Mobile Multimedia Communications，Huaqiao University，Xiamen，Fujian 361021，China |
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| Abstract: | ? ?In this paper， a D2D aided cooperative relaying system using non-orthogonal multiple access （DC-NOMA） is investigated， D2D communication link from relaying user （RU） to cell-center user （CCU） is exploited to transmit a new signal during the information forwarding of RU in the second phase. To improve the transmission reliability， a novel signal detection strategy is designed， which the side information is fully utilized to eliminate the inter-user interference. Based on the novel signal detection strategy， a two-stage relay selection strategy （TSRS） is proposed. In the subset of relays that satisfy cell-edge user （CEU） reliable reception， the relay with the greatest the successful decoding probability of CCU is selected. To evaluate the proposed DC-NOMA scheme， exact outage probabilities are derived for each user and verified by computer simulations. Simulation results demonstrate the outage performance of the proposed DC-NOMA using the TSRS based on the novel signal detection strategy outperforms that a partial relay selection scheme （PRSS） and the conventional DC-NOMA in the high signal-to-noise region. In particular， the increase in the number of relays can effectively improve the outage performance of the proposed system. |
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