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Physical layer security in wireless-powered networks with untrusted relays

机译:具有不受信任的中继的无线供电网络中的物理层安全性

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In this paper, we study the secrecy performance of a wirelessly powered relay-aided system, where a pair of legal users (source-destination) communicate in the presence of multiple untrusted relays. All of the nodes mentioned above are energy constrained and powered by a dedicated power beacon (PB). To prevent the untrusted relays from intercepting the source message and to achieve positive secrecy rate, the destination-based cooperative jamming technique is employed. Besides, the optimal time allocation coefficient to maximize the secrecy throughput and the optimal transmit power of PB to maximize the secrecy energy efficiency are addressed. Specifically, three relay selection schemes with various requirements for channel state information (CSI), i.e., random relay selection, partial relay selection and optimal relay selection are also proposed to enhance the system security further. Finally, simulation results indicate the cooperative jamming technique indeed achieve positive secrecy rate and the proposed optimization strategies can improve the system performance.
机译:在本文中,我们研究了无线中继辅助系统的保密性能,其中一对合法用户(源-目标)在存在多个不受信任的中继的情况下进行通信。上面提到的所有节点均受能量约束,并由专用功率信标(PB)供电。为了防止不受信任的中继拦截源消息并实现正的保密率,采用了基于目标的协作干扰技术。此外,提出了使保密吞吐量最大化的最佳时间分配系数和使保密能量效率最大化的PB的最佳发射功率。具体地,还提出了对信道状态信息(CSI)具有各种要求的三种中继选择方案,即,随机中继选择,部分中继选择和最优中继选择,以进一步提高系统安全性。最后,仿真结果表明,协同干扰技术的确达到了正的保密率,所提出的优化策略可以提高系统性能。

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