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IEEE Vehicular Technology Conference

Cooperative Jamming and Power Allocation in Two-Way Relaying System with Eavesdropper

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

Published Sep 1, 2013• 7 citations
Publisher

Abstract

The security of the 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. Both user and pre-defined jamming signals are transmitted by each source node simultaneously. The optimum power allocation between the user and jamming signals at each source node is derived. 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/vtcfall.2013.6692144

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This paper investigates the physical layer security issue of the three-phase two-way relaying system with an untrusty relay node. New cooperative jamming schemes are proposed for the three-phase bi-directional secrecy communications. The transmit power of each source node is divided into two parts corresponding to the user and jamming signals, respectively. The minimum jamming signal power at each source node is analyzed. An iterative power allocation algorithm is proposed for the three-phase protocol. Numerical results demonstrate the superiority of the proposed cooperative jamming scheme with power allocation.