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arXiv:1710.06985

Artificial-Noise-Aided Secure Channel with a Full-duplex Source

Xinyue Hu, Caihong Kai, Shengli Zhang, Zhongyi Guo, Jun Xiong Gao

Published Oct 19, 2017• 0 citations
arXivHTMLPDF

Abstract

This paper consider a new secure communication scene where a full-duplex transmitter (Alan) need to transmit confidential information to a half-duplex receiver (Bob), with a silent eavesdropper (Eve) that tries to eavesdrop the confidential information. For realizing secure communication between Alan and Bob, a novel two phases communication scheme is proposed: in Phase 1, Alan and Bob send artificial noises (AN) simultaneously, while in Phase 2, Alan superimposes the AN received in Phase 1 with its confidential signal and sends the mixed signalto Bob. Since the mixed AN could degrade the SINR (Signal to Interference and Noise Ratio) of Eve, but does not affect the SINR of Bob, a secrecy capacity can be achieved. We also derive the conditions that the secrecy capacity of the proposed scheme exists, and analyze the secrecy outage probability under Rayleigh fading channel. Numerical results show that the secrecy capacity is about two times higher than without AN, even though in the proposed scheme half of the time is used to transmit ANs, and the outage probability is about five times lower than that without AN.

DOI
10.48550/arxiv.1710.06985

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This letter considers a new secure communication scenario where a full-duplex transmitter (Alan) needs to transmit confidential information to a half-duplex receiver (Bob), with an eavesdropper (Eve) that tries to overhear the confidential information. For realizing the secure communication, we design an effective artificial-noise-aided secure scheme (ANAS) which is composed of two phases' transmissions: in Phase 1, Alan and Bob transmit two independent artificial noises (ANs) simultaneously, while in Phase 2, Alan superimposes the AN received in Phase 1 with its confidential signal and sends out the mixed signal. Since the superimposed AN by Alan in Phase 2 can be effectively cancelled by Bob while remains an interference to Eve, a secrecy rate could then be achieved. Importantly, we derive the approximate closed-form solutions of the average secrecy rate and secrecy outage probability of ANAS under a Rayleigh block-fading channel. Numerical results show that the secrecy rate of ANAS is about twice higher than the benchmark scheme, even though in ANAS half of the time is used to transmit ANs.
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In classical three-node communication scenario, two legitimate users (Alice and Bob) communicate over a fading channel and a third one (Eve) observes their transmission as an eavesdropper. Alice can transmit the signal with artificial noise to ensure security communication. The artificial noise degrades the performance of Eve, and it can be cancelled by Bob because of pre-knowing. In this paper, a new concept - equivalent security SNR is denned for clarity and simplicity. And we make analysis for the existence probability of positive security capacity and the security outage probability. Then we derive the optimal factor of power allocation for artificial noise and give the theoretical results when the eavesdropper's channel quality is very high. Theory analysis and simulation results show that by using artificial noise, the security capacity is increased greatly and the security of the physical layer communication is promised.
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