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IEEE Access

Secrecy Outage Probability Analysis for Full-Duplex Relaying Networks Based on Relay Selection Schemes

Qingfeng Ding, Mengxia Liu, Yuqian Deng

Published Jan 1, 2019• 10 citations
Publisher

Abstract

Considering existing eavesdroppers, this paper analyzes the secrecy outage probability (SOP) of the full-duplex (FD) relaying network with imperfect channel state information (CSI), where the decode-and-forward relay protocol is adopted. To enhance the physical-layer security, two relay selection schemes are proposed. The first scheme uses the maximum-minimum principle to select the optimal relay. The other selection scheme is based on partial signal-to-interference-plus-noise ratio. Then, the tight closed-form approximations of the SOP are obtained for three special CSI cases, respectively. Moreover, based on these approximated results, the effects of some system parameters are analyzed for the SOP of the relay system, including the CSI error, the number of relays, the signal-to-noise ratio (SNR) of the eavesdropper, and the residual self-interference caused by the FD model. The numerical results show that at low SNR of the eavesdropper, residual self-interference has a significantly impact on SOP, while at high SNR of the eavesdropper, this effect is negligible. In addition, the SOP of FD model is always superior to the half-duplex (HD) model when the number of relays changes.

DOI
10.1109/access.2019.2932135

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Considering existing eavesdroppers, this paper analyzes the secrecy outage probability (SOP) of the full-duplex (FD) relaying network with imperfect channel state information (CSI), where the decode-and-forward relay protocol is adopted. To enhance the physical-layer security, two relay selection schemes are proposed. The first scheme uses the maximum-minimum principle to select the optimal relay. The other selection scheme is based on partial signal-to-interference-plus-noise ratio. Then, the tight closed-form approximations of the SOP are obtained for three special CSI cases, respectively. Moreover, based on these approximated results, the effects of some system parameters are analyzed for the SOP of the relay system, including the CSI error, the number of relays, the signal-to-noise ratio (SNR) of the eavesdropper, and the residual self-interference caused by the FD model. The numerical results show that at low SNR of the eavesdropper, residual self-interference has a significantly impact on SOP, while at high SNR of the eavesdropper, this effect is negligible. In addition, the SOP of FD model is always superior to the half-duplex (HD) model when the number of relays changes.
In this paper, the physical layer security of full-duplex two-way multiple amplify-and-forward (AF) relaying network in the presence of an eavesdropper is analyzed. The closed-form expression of the approximate secrecy outage probability (SOP) based on the optimal relay selection scheme (ORS) in maximizing the secrecy capacity of proposed network is given out. Furthermore, Monte-Carlo simulation results validate the analytical expressions and show that secrecy performance can be impacted by different parameters, including the number of candidate relay and the average power of residual self-interference. The simulation results also show that the full-duplex relaying systems based on optimal relay selection scheme can significantly outperform the conventional single-relay systems and the traditional half-duplex scheme in secrecy performance.
This paper studies the secrecy outage probability of full-duplex (FD) relay networks in the presence of external eavesdropper and residual self-interference, where the FD relay can forward message or transmit jamming signal. Different with the existing researches which consider the full-duplex relay employs decode-and-forward (DF) protocol, we study the situation that the FD relay uses amplify-and-forward (AF) protocol, and propose a destination aided jamming scheme to further improve the secrecy performance when the FD relay transmits jamming. Furthermore, we compare the secrecy outage probability of four different schemes (i.e., AF forwarding scheme, AF destination- aided jamming scheme, DF forwarding scheme and DF jamming scheme), and give the answer that which mode the FD relay should employ with different system parameters.
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.
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.
Full duplex (FD) protocol has been widely used in wireless communications, which could transmit and receive signals at the meantime. In this paper, considering the worst-case channel uncertainty, opportunistic relaying and jamming strategy in decode-and-forward (DF) hybrid full/half-duplex (HD) relay system is proposed to enhance security. Specifically, the relay works in FD protocol to receive the confidential signals and transmit jamming signals at the first time slot. Then, the relay switches to HD protocol to transmit the decoded signals. Meanwhile, jammers emit cooperative jamming (CJ) signals to interfere the eavesdropper at two transmission slots. Suppose that imperfect eavesdropper channel condition is considered, we propose a worst-case robust design to obtain distributed jamming weights, which is solved through semi-definite program (SDP). Furthermore, we analyze secrecy rate and secrecy outage performance of the proposed scheme. As a benchmark, a traditional relay selection strategy with HD protocol in distributed relay system is listed for comparison. Simulation results demonstrate that our hybrid scheme with robust design outperforms the traditional relay selection scheme, because the traditional scheme does not consider hybrid FD/HD protocols and robust design based on imperfect channel conditions.
We characterised the physical layer security of a three terminal cooperative network with full-duplex relaying under Nakagami-m channel analytically and through simulation. An eavesdropper also coexists within the system at an arbitrary distance from the transmitter. Using secrecy outage probability as a metric to characterise the secrecy performance, integral expression for the corresponding outage probability of the relevant communication link is derived. Furthermore, the secrecy outage probability with half-duplex relay is also analysed. Simulation results show that cooperative communication with FD relay has less secrecy outage even with the presence of residual self-interference than HD relay.