TITLE:
Secure Communications for Two-Way Relay Networks Via Relay Chatting
AUTHORS:
Jun Xiong, Dongtang Ma, Chunguo Liu, Xin Wang
KEYWORDS:
Two-way Relay Networks; Physical Layer Security; Relay Chatting
JOURNAL NAME:
Communications and Network,
Vol.5 No.3C,
November
7,
2013
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.