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Lecture notes in electrical engineering

Secrecy Performance of Joint Relay and Jammer Selection Methods in Cluster Networks: With and Without Hardware Noises

Phu Tran Tin, Tran Trung Duy, Phuong T. Tran, Miroslav Vozn̆ák

Published Dec 6, 2016• 3 citations
Publisher
DOI
10.1007/978-3-319-50904-4_78

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In this paper, we investigate joint relay and jammer selection in a two-way relay network with secrecy constraints, in which there are two sources, a cluster of intermediate nodes, and one eavesdropper. Under a decode-and-forward (DF) protocol, the considered two-way relay network implements a complete transmission in three phases. An intermediate node is selected as conventional relay and another two are selected as jammers during these phases, in order to improve security against the malicious eavesdropper. We find that when the jamming power is higher than that of source nodes, the proposed scheme has a better and more stable secrecy performance than the conventional non- jamming schemes. In addition, the system's security status gets increasingly better when more intermediate nodes are added into the relay/jamming cluster.
Physical layer security is a promising technique to realize secure wireless communications without relying on conventional cryptographic methods. In cooperative networks with secrecy constraints, joint relay and jammer selection (JRJS) is an efficient approach to improving the security performance. However, due to feedback delay, the channel state information (CSI) used in the selection process may become outdated and differ from the CSI during the actual transmission of data and jamming. In this work, we study the effect of feedback delay on the JRJS scheme with decode-and-forward relaying strategy. We provide a lower bound for the ergodic secrecy capacity (ESC) and approximate closed-form expressions for the secrecy outage probability (SOP). Monte Carlo simulations are performed to verify the analytical results. The simulation results show that feedback delay decreases the ESC and increases the SOP floor of JRJS. However, in spite of the performance degradation, JRJS outperforms the conventional relay selection scheme without jamming.