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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Outage Performance Improvement by Selected User in D2D Transmission and Implementation of Cognitive Radio-Assisted NOMA
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Outage Performance Improvement by Selected User in D2D Transmission and Implementation of Cognitive Radio-Assisted NOMA

机译：选定用户在D2D传输和认知无线电辅助NOMA实施中的停机性能改进

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摘要

In this paper, we investigate the outage performance in secondary network of cognitive radio (CR) employing non-orthogonal multiple access (NOMA) wireless networks over Rayleigh fading channels. The considered system model adopts device-to-device (D2D) transmission together with traditional communication to form a new system model, namely CR-D2DNOMA network. The specific user is selected from multiple D2D-Tx users (D2Ds) to communicate with far NOMA users to form qualified D2D connection with assistance of the Relay user ( ). The main metric in such CR-D2DNOMA network needs to be considered and we particularly introduce the closed-form expressions for outage probability in the secondary network where it is designed to serve two far NOMA users. The perfect Successive Interference Cancellation (SIC) and imperfect SIC can be further examined at the second NOMA user who detects signal based on the ability of SIC. The results show the positive impact of increasing the fading parameters on the system performance. More importantly, numerical results are provided to verify the correctness of our derivations. Additionally, the effects of asymptotic expressions on insights evaluation are also further analyzed.
机译：在本文中，我们研究了在瑞利衰落信道上使用非正交多址（NOMA）无线网络的认知无线电（CR）辅助网络中的中断性能。所考虑的系统模型采用设备到设备（D2D）传输以及传统通信来形成一个新的系统模型，即CR-D2DNOMA网络。从多个D2D-Tx用户（D2D）中选择特定用户，以与其他NOMA用户进行通信，以在中继用户（）的帮助下形成合格的D2D连接。需要考虑此类CR-D2DNOMA网络中的主要指标，我们特别介绍了次级网络中用于服务两个远程NOMA用户的停机概率的封闭式表达式。完美的连续干扰消除（SIC）和不完善的SIC可以在第二位基于SIC能力检测信号的NOMA用户中进一步检查。结果表明，增加衰落参数对系统性能具有积极影响。更重要的是，提供了数值结果来验证我们推导的正确性。此外，还进一步分析了渐近表达对洞察力评估的影响。

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