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智能窃听下协作NOMA网络的性能分析 被引量:3

Performance Analysis of Cooperative NOMA Network with Intelligent Eavesdropping
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摘要 针对下行双用户NOMA(Non-Orthogonal Multiple Access)系统模型中存在智能窃听者,该窃听者可自适应地选择被动窃听或主动干扰工作模式,在不精确了解其干扰水平的情况下,部分NOMA用户很有可能遭遇传输质量下降乃至保密中断,这将对信息安全传输构成严重威胁。另外,由于信道衰落,用户的位置对系统整体性能有很大影响,难以保证距离源节点较远用户的传输质量。更值得考虑的是,由于节点的自私性,用户间的协作公平性也是一大挑战。由此,本文设计了一种新型的两阶段用户协作方案。第一阶段,NOMA网络中远端用户采用全双工(full-duplex,FD)干扰智能窃听者。目前,全双工技术一般用于提高频谱资源利用率以及用户数据吞吐量方面,本方案设计将全双工结合预编码矩阵用于干扰窃听,可在不干扰合法用户下有效降低窃听者质量。第二阶段,近端用户可作为一个中继协助源节点转发远用户信号信息,并在接收端采用串行干扰消除(Successive Interference Cancellation,SIC)技术进行解码。考虑到系统中不同用户的信息接收速率与通信需求不同之间的相关性,分别推导了遍历安全容量和遍历容量的解析表达式,同时分析了功率分配因子和用户间协作发射功率等因素对性能的影响。结果表明所提方案比现有方案,近端用户性能提升约21.4%,远端用户性能提升约6.5%,且信息接收更为平稳,并通过Monte-Carlo仿真验证了其正确性。 In a downlink non-orthogonal multiple access(NOMA)system model with double users,there exists an intelligent eavesdropper that performs either passive eavesdropping or active jamming adaptively.Without an accurate understanding of the interference level,some NOMA users are likely to experience degraded transmission quality or even confidential interruptions,which threaten the secure transmission severely.Besides,the user’s location has a great influence on performance due to the open nature of wireless channel,so edge users far away from the source node cannot guarantee the user’s information transmission rate.What is more it’s worth considering,the user fairness is also a big challenge because of the selfishness of nodes.Thus,this paper designs a new cooperative NOMA scheme.In the first stage,the edge users employ the full-duplex jamming(FD)to send jamming signals to intelligent eavesdropper.The technology of the full duplex are commonly used to improve spectrum utilization and user data throughput.Full duplex combined with precoding matrix is used to interfere with the eavesdropper,which reduce the quality of eavesdropper without interfering with legitimate users effectively.In the second stage,close users can act as relays to assist edge users forwarding signals.The successive interference cancellation technique is used to decode signals in the receiving terminal.This achieves the cooperation between the close users and edge users and improves the security of the communication link and the service quality of the users.Considering the correlation between different users of information receiving rates and communication demands in the system,the closed-form expressions of ergodic achievable secrecy rate(EASR)and ergodic capacity are derived respectively.Meanwhile,the influence of power allocation factor and the transmission power between users on performance are analyzed.At the same time,the influence of the power allocation factor and the transmission power between users on performance are analyzed.The res
作者 路晓华 贺玉成 张良梅 周林 LU Xiaohua;HE Yucheng;ZHANG Liangmei;ZHOU Lin(Xiamen Key Laboratory of Mobile Multimedia Communications,Huaqiao University,Xiamen,Fujian 361021,China;State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an,Shaanxi 710071,China)
出处 《信号处理》 CSCD 北大核心 2021年第1期148-157,共10页 Journal of Signal Processing
基金 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(18014082029) 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)。
关键词 非正交多址技术(NOMA) 智能窃听 全双工 协作中继 串行干扰消除 non-orthogonal multiple access(NOMA) intelligent eavesdropper full-duplex cooperative relaying successive interference cancellation
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