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IEEE Wireless Communications and Networking Conference

Cooperative jamming and power allocation in three-phase two-way relaying wiretap systems

Hang Long, Wei Xiang, Jing Wang, Yueying Zhang, Wenbo Wang

Published Apr 1, 2013• 17 citations
Publisher

Abstract

The security of the three-phase two-way relaying system with an eavesdropper is investigated in this paper. A cooperative jamming and power allocation scheme is proposed to enhance the system secrecy capacity. When a source node transmits user signals to the relay node, the other source node interferes the relay node with pre-defined jamming signals simultaneously. Optimum power allocation between the user and jamming signals at each source node is analyzed. Our analytical results suggest that the proposed cooperative jamming scheme improves on the system secrecy capacity, especially when the channel gains of the two source-relay links are of large difference. Simulation results in close agreement with analytical results clearly demonstrate the advantage of the proposed cooperative jamming scheme.

DOI
10.1109/wcnc.2013.6555247

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This paper investigates a four-node wiretap network including one source (S), one relay (R), one legitimate receiver (D) and one eavesdropper (E) with cooperative jamming in a two-hop relay transmission. In the first phase, S transmits an useful signal to R while D transmits an interference signal with the purpose of confounding the eavesdropper. In the second phase, R broadcasts the mixture signal together to D. In this paper, based on large-scale fading, we propose two system models named One-link Wiretap Model and Three-link Wiretap Model to distinguish the receiving links at E. Then, a power allocation scheme is proposed to maximize the average secrecy capacity through two-dimension optimization. Meanwhile, we solve the optimization problem by two different methods called IBO and IAO. Simulation results show that the proposed power allocation strategy can achieve a higher average secrecy capacity than the reference scheme RJPA (Rate-optimal jamming power allocation) in the two models. Besides, a larger security range can be obtained by the proposed scheme.