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Secure Communications for Two-Way Relay Networks Via Relay Chatting
School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
National Key Laboratory of Blind Signals Processing, Chengdu, China
School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
- 1 School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
- 2 School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
- 3 National Key Laboratory of Blind Signals Processing, Chengdu, China
- 4 School of Electronic Science and Engineering, National University of Defense Technology, Changsha, China
Communications and Network·Volume 05 (2013)·Pages 42–47·Published 27 September 2013·DOI10.4236/cn.2013.53B2009
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Abstract
In this paper, we investigate a two-way relay network consisting of two sources, multiple cooperative relays and an eavesdropper. To enhance secure communications, a new relay chatting based on transmission scheme is proposed. Specifically, the proposed scheme selects a best relay that maximize the sum mutual information among the sources to forward the sources’ signals using an amplify-and-forward protocol, and the remaining relays transmit interference signals to confuse the eavesdropper via distributed beam forming. It can be found that the proposed scheme with relay chatting does not require the knowledge of the eavesdropper’s channel, and outperforms the joint relay and jammer selection scheme, which introduces the interference into the sources. Numerical results show that the secrecy outage probability of the proposed scheme converges to zero as the transmit power increases.
KeywordsTwo-way Relay NetworksPhysical Layer SecurityRelay Chatting
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