Special Issue Article Open Access

To Enhance Secrecy in Two Way Relay Network by Selecting Relay/Jamming Node Intelligently

Abstract

It set up the utility of user support in assisting secure wireless communications against the malicious eavesdropper. In this paper, we consider joint relay and jammer selection in two-way cooperative networks. It mainly consisting of two sources, one is eavesdropper in communication channel for disturbing communication, and a number of intermediate nodes. These intermediate nodes having some constraints for secrecy about data. While Conventional cryptography based approaches focus on hiding the meaning of the information being communicated from the eavesdropper, we consider a complimentary class of strategies that limit knowledge of the existence of the information from the eavesdropper. We are selecting few intermediate nodes for our utility in which one of them operates in conventional relay mode which assist to another nodes for communicating with each other. The proposed scheme enables an opportunistic selection of few relay nodes to increase security against eavesdroppers in which first relay operates as a conventional mode and it assists to other nodes to deliver its data to a destination via Amplify-and-Forward strategy. Three cooperative schemes we have considered here: decode-and-forward (DF), amplify-and-forward (AF), and cooperative jamming (CJ) for developing our utility. The new approach is analysed for different complexity requirements based on instantaneous and average knowledge of the eavesdropper channels. In addition an investigation of an hybrid security scheme which switches between jamming and non-jamming protection is discussed in the paper. We find that in a scenario where the relay and jamming nodes are randomly and sparsely distributed, the proposed schemes with cooperative jamming outperform the conventional non-jamming schemes within a certain transmitted power range. We also find that, in a scenario where the intermediate nodes gather as a close cluster, the cooperative jamming schemes may be less effective than their nonjamming counterparts. Therefore, we introduce a hybrid scheme to switch between jamming and non-jamming modes.

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