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Relay and jammer selection schemes for improving physical layer security in two-way cooperative networks

机译：用于提高双向协作网络中物理层安全性的中继和干扰选择方案

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This paper is concerned with the relay and jammers selection, in two-way cooperative networks to improve their physical layer security. Three different categories of selection schemes are proposed which are; selection schemes without jamming, selection schemes with conventional jamming and selection schemes with controlled jamming. The selection process is analyzed for two different network models; single eavesdropper model and multiple cooperating and non-cooperating eavesdroppers' model. The proposed schemes select three intermediate nodes during two communication phases and use the Decode-and-Forward (DF) strategy to assist the sources to deliver their data to the corresponding destinations. The performance of the proposed schemes is analyzed in terms of ergodic secrecy rate and secrecy outage probability metrics. The obtained results show that the selection schemes with jamming outperform the schemes without jamming when the intermediate nodes are distributed dispersedly between sources and eavesdropper nodes. However, when the intermediate nodes cluster gets close to one of the sources, they are not superior any more due to the strong interference on the destination nodes. Therefore, a hybrid scheme which switches between selection schemes with jamming and schemes without jamming is introduced to overcome the negative effects of interference. Finally, a comparison between relay and jammers selection schemes in both one-way and two-way cooperative networks is given in terms of both secrecy metrics. The obtained results reveal that, despite the presence of cooperating eavesdroppers, the proposed selection schemes are still able to improve both the secrecy rate and the secrecy outage probability of the two-way cooperative networks.
机译：本文关注在双向协作网络中中继和干扰的选择，以提高其物理层的安全性。提出了三种不同的选择方案类别：没有干扰的选择方案，具有传统干扰的选择方案和具有受控干扰的选择方案。分析了两种不同网络模型的选择过程；单个窃听者模型以及多个合作和非合作的窃听者模型。所提出的方案在两个通信阶段中选择了三个中间节点，并使用解码转发（DF）策略来协助源将其数据传递到相应的目的地。根据遍历保密率和保密中断概率度量来分析所提出方案的性能。获得的结果表明，当中间节点分散在源节点和窃听者节点之间时，具有干扰的选择方案优于没有干扰的方案。但是，当中间节点群集接近源之一时，由于对目标节点的强烈干扰，它们不再具有优势。因此，为了克服干扰的负面影响，引入了一种在有干扰的选择方案和无干扰的方案之间切换的混合方案。最后，从保密性的角度对单向和双向合作网络中中继和干扰选择方案进行了比较。所得结果表明，尽管存在协作的窃听者，但所提出的选择方案仍然能够提高双向合作网络的保密率和保密中断概率。

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