基于人工噪声和SWIET的安全双向中继通信

发布时间：2018-01-26 01:48

本文关键词： 安全通信双向中继网络信息与能量同时传输干扰功率分配　出处：《华中科技大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：针对基于解码转发的对称双向中继网络的安全传输问题,提出一种基于人工噪声干扰和信息、能量同时传输技术(SWIET)的物理层安全传输策略.系统采用两时隙传输方案,能量收集节点利用第一时隙收集的能量发射人工噪声干扰,而用户节点和中继分别通过功率分配技术将目的节点先验已知的人工噪声干扰添加到有用信息中,以降低窃听信道的传输质量.建立双向中继网络窃听信道下联合能量收集和无能量收集节点的两种数学模型,推导基于人工噪声干扰的系统保密容量的数学表达式,分别求解两种模型的最大化系统保密容量下最优功率分配因子,并分析了SWIET技术对系统保密容量的增益.仿真结果表明:对应于不同的窃听节点位置,所提出的联合SWIET技术的方案能使双向中继网络保密性能改善3%~90%,且能量收集节点越靠近窃听节点,系统性能越好.
[Abstract]:To solve the problem of secure transmission in symmetric two-way relay networks based on decoding and forwarding, a new method based on artificial noise interference and information is proposed. The system adopts a two-slot transmission scheme, in which the energy collection node emits artificial noise interference using the energy collected from the first slot. The user node and relay add the prior known artificial noise interference to the useful information by power allocation technology. In order to reduce the transmission quality of eavesdropping channel, two mathematical models of joint energy collection node and non-energy collection node in bidirectional relay network eavesdropping channel are established. The mathematical expressions of the system security capacity based on artificial noise interference are derived, and the optimal power allocation factors for maximizing the system security capacity of the two models are respectively solved. The gain of SWIET technology to the security capacity of the system is analyzed. The simulation results show that the different eavesdropping nodes are corresponding to the different positions of the eavesdropping nodes. The proposed scheme of joint SWIET technology can improve the security performance of bidirectional relay network. The closer the energy collection node is to the eavesdropping node, the better the system performance will be.
【作者单位】：南昌大学信息工程学院;
【基金】：国家自然科学基金资助项目(61362009,41504026) 江西省青年科学基金重大项目资助项目(20152ACB21003)
【分类号】：TN918.91
【正文快照】： 近年来利用协作通信技术创造主信道优势成为小型单天线、低功耗系统中实现不依赖传统密钥技术的安全通信的有效手段[1],尤其是双向中继网络还可以结合物理层编码技术,克服半双工的限制,有效提高频带利用率[2].另有研究表明:引入人工噪声,采用外部干扰的物理层安全协作策略将会

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