北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2020, Vol. 43 ›› Issue (3): 105-111,124.doi: 10.13190/j.jbupt.2019-179

• 研究报告 • 上一篇    下一篇

能量采集衬底式认知协作中继网络安全中断概率分析

罗轶1,2, 王雨婷1, 施荣华3, 严梦纯1, 曾豪1   

  1. 1. 湖南师范大学 智能计算与语言信息处理湖南省重点实验室, 长沙 410081;
    2. 中南大学 自动化学院, 长沙 410083;
    3. 中南大学 计算机学院, 长沙 410083
  • 收稿日期:2019-09-09 出版日期:2020-06-28 发布日期:2020-06-24
  • 作者简介:罗轶(1980-),男,讲师,E-mail:km_luoyi@sina.com.
  • 基金资助:
    国家自然科学基金项目(61872390);湖南省科技计划基金项目(2018TP1018)

Secrecy Outage Probability Analysis of Underlay Cognitive Cooperative Relay Network with Energy Harvesting

LUO Yi1,2, WANG Yu-ting1, SHI Rong-hua3, YAN Meng-chun1, ZENG Hao1   

  1. 1. Hunan Provincial Key Laboratory of Intelligent Computing and Language Information Processing, Hunan Normal University, Changsha 410081, China;
    2. School of Automation, Central South University, Changsha 410083, China;
    3. School of Computer Science and Engineering, Central South University, Changsha 410083, China
  • Received:2019-09-09 Online:2020-06-28 Published:2020-06-24
  • Supported by:
     

摘要: 能量受限协作中继网络频谱利用率低,生存周期短,无线信道开放性所带来的物理层安全受到威胁,对此,将功率信标辅助射频能量采集技术、认知无线电技术和协作中继网络相结合,构建了一种新的中继节点分散布置的能量收集2跳认知协作中继网络;引入单窃听节点对第2跳传输进行窃听,并结合主动和被动窃听方式提出了最优中继选择和次优中继选择方式,推导了2种中继选择方式下次网络安全中断概率闭合式.数值计算和仿真结果表明,主接收节点和中继数目、中继和窃听节点位置设置、能量采集比例、能量转换效率以及信道容量和安全容量阈值都会对次网络安全中断性能产生显著影响.最优中继选择方式下的次网络安全中断性能明显优于次优中继选择方式.功率信标信号功率或干扰约束的增大使得次网络安全中断概率降低,并趋于饱和.

关键词: 能量采集, 认知中继网络, 中继选择方式, 安全中断概率

Abstract: Aiming at the problems of low spectrum utilization, short lifetime and the physical layer security caused by the openness of the wireless channel of energy-constrained cooperative relay network, a new two hop cognitive cooperative relay network with distributed relay nodes is constructed by combining power beacon assisted RF energy collection technology, cognitive radio technology and cooperative relay network. Then, a single eavesdropping node is introduced to eavesdrop the second hop transmission, and the optimal relay selection and the sub optimal relay selection are proposed in combination with the active and passive eavesdropping modes respectively, and the closed-form secrecy outage probability expressions of secondary network under two relay selection modes is deduced. It is shown in simulations that the secrecy outage performance of secondary network is significantly affected by the number of primary receiver nodes and relays, the location of relays and the eavesdropping node, the ratio of energy harvesting, the efficiency of energy conversion, and the thresholds of channel capacity and secrecy capacity. The secrecy outage performance of the secondary network under the optimal relay selection scheme is obviously better than that of the suboptimal relay selection scheme. The secrecy outage probability of secondary network is reduced and tends to be saturated by increasing interference constraint or power beacon signals' power.

Key words: energy harvesting, cognitive relay network, relay selection scheme, secrecy outage probability

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