Wireless Networks ( IF 3 ) Pub Date : 2020-11-06 , DOI: 10.1007/s11276-020-02487-w Milad Tatar Mamaghani , Ali Kuhestani , Hamid Behroozi
Cooperative relaying is utilized as an efficient method for data communication in wireless sensor networks and the Internet of Things. However, sometimes due to the necessity of multi-hop relaying in such communication networks, it is challenging to guarantee the secrecy of cooperative transmissions when the relays may themselves be eavesdroppers, i.e., we may face with the untrusted relaying scenario where the relays are both necessary helpers and potential adversary. To obviate this issue, a new cooperative jamming scheme is proposed in this paper, in which the data can be confidentially communicated from the source to the destination through multiple untrusted relays. In our proposed secure transmission scheme, all the legitimate nodes contribute to providing secure communication by intelligently injecting artificial noises to the network in different communication phases. For the sake of analysis, we consider a multi-hop untrusted relaying network with two successive intermediate nodes, i.e, a three-hop communications network. Given this system model, a new closed-form expression is presented in the high signal-to-noise ratio (SNR) regime for the Ergodic secrecy rate (ESR). Furthermore, we evaluate the high-SNR slope and power offset of the ESR to gain an insightful comparison of the proposed secure transmission scheme and the state-of-arts. Our numerical results highlight that the proposed secure transmission scheme provides better secrecy rate performance compared with the two-hop untrusted relaying as well as the direct transmission schemes.
中文翻译:
依靠不受信任的放大转发中继的多跳链路能否提高安全性?
合作中继被用作一种有效的方法,用于无线传感器网络和物联网中的数据通信。但是,有时由于在这种通信网络中需要进行多跳中继,当中继本身可能是窃听者时,要保证协作传输的保密性是一项挑战,即,我们可能会面临不信任的中继场景,因为中继都是必要的帮助者和潜在的对手。为了解决这个问题,本文提出了一种新的协作干扰方案,其中可以通过多个不受信任的中继将数据从源秘密传输到目的地。在我们提出的安全传输方案中,所有合法节点都通过在不同的通信阶段向网络智能注入人为噪声,为提供安全的通信做出了贡献。为了分析起见,我们考虑具有两个连续的中间节点的多跳不信任中继网络,即三跳通信网络。给定该系统模型,以遍历保密率(ESR)的高信噪比(SNR)格式呈现了一种新的闭式表达式。此外,我们评估了ESR的高SNR斜率和功率偏移,以对建议的安全传输方案和最新技术进行深入的比较。我们的数值结果表明,与两跳不可信中继以及直接传输方案相比,所提出的安全传输方案提供了更好的保密率性能。