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International Conference on Information and Communication Technology Convergence (ICTC)

Secure full-duplex relay network using cooperative jamming

Junguk Park, Sangseok Yun, Jeongseok Ha

Published Oct 1, 2017• 0 citations
Publisher

Abstract

In this work, we propose a full-duplex relay (FDR) network for secure communication in the presence of an eavesdropper. We consider both the destination and the amplify-and-forward relay has a full-duplex capability for a higher rate and/or a stronger secrecy performance. In particular, the destination transmits a cooperative jamming signal while receiving the relayed signal. To get analytic understanding, we derive a closed-form expression for the secrecy rate of the proposed FDR network. Numerical evaluations are also conducted to verify the analytic results.

DOI
10.1109/ictc.2017.8190806

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In this work, we propose a full-duplex relay (FDR) network for secure communication in the presence of an eavesdropper. We consider both the destination and the amplify-and-forward relay has a full-duplex capability for a higher rate and/or a stronger secrecy performance. In particular, the destination transmits a cooperative jamming signal while receiving the relayed signal. To get analytic understanding, we derive a closed-form expression for the secrecy rate of the proposed FDR network. Numerical evaluations are also conducted to verify the analytic results.
This letter studies secure communications in a full-duplex relay (FDR) network when an eavesdropper overhears communications between legitimate parties. In a FDR network, both the amplify-and-forward relay and the destination operate in full-duplex for the purpose of achieving a higher secrecy rate and/or improving security. In particular, the destination is capable of receiving the relayed signal and simultaneously emitting a cooperative jamming signal. This work is motivated by an intriguing question: how much residual self-interference (SI) in a FDR network is allowed to achieve a superiority of secrecy performance over conventional half-duplex relay (HDR) networks? To answer the question, the secrecy outage probability (SOP) of the FDR network is derived as a function of residual SI. The analytic results enable us to compare the SOPs of existing HDR networks and the FDR network at various levels of residual SI. In addition, this work allows one to opportunistically select either FD or HD, which leads to a significant performance improvement.
In this paper, we focus on a practical communication system, an untrusted full-duplex relay (UFDR) network with a transmitter Alice and a full-duplex receiver Bob. The relay is untrusted who is supposed to forward the signal to Bob and at the same time, acts as a potential eavesdropper to intercept the message from Alice. Since there is no direct link between Alice and Bob, positive secrecy rate can not be obtained. To handle with this issue, based on the precondition that in-band full-duplex technology has been basically matured and can be applied in relay communication, we propose a destination-aided cooperative intended jamming scheme (UFDR-IJ scheme for short). We study the secure performance of the communication system model described in this paper, and obtain a closed-form expression for the secrecy outage probability which verifies the fact that the UFDR-IJ scheme can significantly enhance the secure performance while double the secrecy capacity of the communication system comparing to the traditional cooperative communication scheme.
This paper investigates the secrecy performance of a full-duplex relaying (FDR) system with a full-duplex (FD) receiver. A novel cooperative jamming protocol is proposed to improve physical layer security, where the FD receiver sends interference to the eavesdropper to degrade its received signal-to-noise ratio when receiving signals from the relay and the source. Taking the residual self-interference (RSI) at both the relay and the FD receiver into consideration, the expressions of secrecy outage probability of the system are derived, where two independent behaviors of the relay toward the jamming signal are considered, 1) the jamming signal from the FD receiver is recognized as an interference at the relay; and 2) the jamming signal is priori known at the relay. Simulation results verified the correctness of the derived expressions and the effectiveness of the proposed protocol. It is demonstrated that the secrecy performance of the system can be significantly enhanced and the gain in terms of the decreased secrecy outage probability becomes more evident in case that the RSI is somewhat low when the proposed protocol is used.
In this paper, the physical-layer security of a cooperative wireless system with multi-antenna full-duplex (FD) destination is examined. More specifically, we consider a cooperative transmission scenario in which a source communicates with a destination through a relay in the presence of an eavesdropper. In order to degrade the wiretap channel, the FD destination simultaneously transmits an interference signal towards the eavesdropper, while receiving information from the relay. A joint transmit and receive beamformer design is proposed to maximize the signal-to-interference-plus-noise ratio (SINR) at the destination, while guaranteeing that the SINR at the eavesdropper is below a certain threshold. We reformulate the optimization problem as a semidefinite relaxation problem in terms of a transmit beamforming matrix. To balance the performance and system complexity, we investigate suboptimum beamforming designs based on zero-forcing criterion. We derive exact closed-form expressions for the average secrecy rates of the proposed suboptimum designs. Our results reveal that optimum and suboptimum beamforming schemes along with friendly jamming significantly improve the secrecy performance. Moreover, simulation results demonstrate that the optimum scheme outperforms suboptimum schemes, especially in high transmit power regimes.
In this letter, we consider secure communications in multi-hop relaying systems, where full-duplex relays (FDRs) operate to enhance wireless physical layer security. Each FDR is designed to transmit jamming signals to the eavesdropper when it receives information signals from the previous adjacent node. The achievable secrecy rate with the proposed decode-and-forward (DF) FDRs are analyzed with a total transmit power constraint. The transmit power allocation problem is solved by using the geometric programming (GP) method. Numerical results present that the proposed FDRs significantly enhance the secrecy rate compared to the conventional half-duplex relays (HDRs).
In this paper, we investigate the physical layer security of a dual-hop cooperative network in the presence of a full-duplex active eavesdropper, which can overhear the confidential signals and transmit jamming signals simultaneously. We utilize the optimal relay selection scheme to improve the secrecy performance, where the relay maximizing the secrecy capacity will be selected to forward the information. To evaluate the secrecy performance of our system, we derive a compact closed-form expression of the secrecy outage probability. Besides, we also analyze the asymptotic performance related to the position of the nodes. Finally, we verify our analysis through the numerical results, and demonstrate that there exists a secrecy protection region where the secrecy outage probability is below a target probability.