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IEEE Wireless Communications Letters

To Establish a Secure Channel From a Full-Duplex Transmitter to a Half-Duplex Receiver: An Artificial-Noise-Aided Scheme

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

Published Oct 17, 2018• 9 citations
Publisher

Abstract

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.

DOI
10.1109/lwc.2018.2876540

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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.
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.
This letter considers the secure MIMO transmission in a wireless environment, in which one transmitter (Alice), one receiver (Bob) and one eavesdropper (Eve) are involved. Apart from the artificial noise (AN) generated by Alice, Bob can also exploit his remaining antenna resources to emit AN to further impair Eve's channel. Such kind of AN can be cancelled by Bob himself by applying the Full-Duplex wireless communication technique. A computable secrecy rate is obtained for this model over a Rayleigh-fading eavesdropping channel. In order to maximize the secrecy rate, a joint optimization scheme is proposed to assign the TX/RX antennas for Bob and to design the beamforming and power allocation for Alice's information and AN signal. Simulation is carried out to illustrate the process of the proposed optimization scheme.
Summary This paper considers a full‐duplex (FD) secure transmission scheme with aid of the artificial noise deployed at both transmitter and receiver under imperfect self‐interference cancellation. The expressions of secrecy and connection outage probabilities are derived, and hence, the secrecy throughput of the proposed scheme is evaluated. The results show that the performance of the proposed FD scheme outperforms that of conventional half‐duplex and FD receiver schemes in terms of the secrecy outage probability. In addition, the proposed FD scheme can achieve high secrecy throughput under various locations of the eavesdropper. Especially when the eavesdropper is located close to the transmitter, the secrecy throughput of the proposed FD scheme is nearly double that of the half‐duplex scheme with artificial noise injection while that of the scheme with FD jamming receiver goes to zero.
In this paper, we investigate the performance of artificial noise assisted secure communication in the presence of a full-duplex active eavesdropper who can simultaneously perform eavesdropping and jamming. An approximate closed-form expression for the secrecy rate is derived. With this result, we obtain a new result for the optimal power allocation factor maximizing the secrecy rate, and analyze the impact of self-interference coefficient and jamming power on it. We further consider a more practical scenario where the legitimate user aims to maintain a given target data rate and uses all remaining power for artificial noise (AN) to interfere with the eavesdropper. While the eavesdropper tries to compel the transmitter to reduce the AN by sending jamming signals to the legitimate receiver. To solve this conflict, we introduce a power cost parameter to describe the impact of jamming on the eavesdropper itself and then formulate a game-theoretic framework. We also derive the closed-form equilibrium solutions for both sides. These results show the optimal jamming strategy of the eavesdropper and provide insights into the low bound secrecy performance. Finally, simulation results are provided to verify our analytical results.
In Rayleigh fading channels, we investigate the secrecy performance of a full-duplex relay secure transmission system. To improve the secrecy capacity of the system and efficiently interfere the interception of the eavesdropper, the multiple-antenna source applies the artificial noise aided precoding (ANP) scheme to broadcast the intended signal and the artificial noise simultaneously, and the decode-and-forward relay operates in full- duplex mode. To improve the received signal-to-noise ratio (SNR), the multiple-antenna destination applies maximum ratio combining (MRC) strategy. In the presence of self-interference at the relay, the approximate closed-form expression of ergodic achievable secrecy rate (EASR) for any values of antenna number and the exact closed-form expression of EASR for large-scale antennas array were derived respectively. Both the theoretical analysis and numerical simulations show that the ANP combined with full-duplex scheme can achieve considerable secrecy performance gain.
We propose an artificial-noise (AN)-aided transmission scheme to achieve two objectives: 1) energize a single-antenna legitimate transmitter (Alice) by receiving an AN signal from a multi-antenna base-station (Bob) and 2) secure the information signal transmitted from Alice to Bob from eavesdropping by a multi-antenna eavesdropper (Eve). We assume a two-phase transmission scheme. In the first phase, Bob transmits two orthogonal precoded AN vectors to power Alice and confuse Eve. In the second phase, Alice transmits her information signal to Bob along with an amplified version of the AN signal to confuse Eve. Our numerical results show that the proposed scheme can efficiently power Alice while securing her transmissions. Moreover, we show that the achieved average secrecy rate under the proposed scheme outperforms the case when the conventional communication scheme is employed.