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arXiv:1612.05881

Physical-Layer Security of a Buffer-Aided Full-Duplex Relaying~System

Ahmed El Shafie, Sultan, Ahmed, Naofal Al‐Dhahir

Published Dec 18, 2016• 0 citations
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Abstract

This letter proposes a novel hybrid half-/full-duplex relaying scheme to enhance the relay channel security. A source node (Alice) communicates with her destination node (Bob) in the presence of a buffer-aided full-duplex relay node (Rooney) and a potential eavesdropper (Eve). Rooney adopts two different relaying strategies, namely randomize-and-forward and decode-and-forward relaying strategies, to improve the security of the legitimate system. In the first relaying strategy, Rooney uses a codebook different from that used at Alice. In the second relaying strategy, Rooney and Alice use the same codebooks. In addition, Rooney switches between half-duplex and full-duplex modes to further enhance the security of the legitimate system. The numerical results demonstrate that our proposed scheme achieves a significant average secrecy end-to-end throughput improvement relative to the conventional bufferless full-duplex relaying scheme.

DOI
10.48550/arxiv.1612.05881

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This letter proposes a novel hybrid half-/full-duplex relaying scheme to enhance the relay channel security. A source node (Alice) communicates with her destination node (Bob) in the presence of a buffer-aided full-duplex relay node (Rooney) and a potential eavesdropper (Eve). Rooney adopts two different relaying strategies, namely randomize-and-forward and decode-and-forward relaying strategies, to improve the security of the legitimate system. In the first relaying strategy, Rooney uses a codebook different from that used at Alice. In the second relaying strategy, Rooney and Alice use the same codebooks. In addition, Rooney switches between half-duplex and full-duplex modes to further enhance the security of the legitimate system. The numerical results demonstrate that our proposed scheme achieves a significant average secrecy end-to-end throughput improvement relative to the conventional bufferless full-duplex relaying scheme.
This letter proposes a novel hybrid half-duplex (HD)/full-duplex (FD) relaying scheme to enhance the relay channel security. A source node (Alice) communicates with her destination node (Bob) in the presence of a buffer-aided FD relay node (Rooney) and a potential eavesdropper (Eve). Rooney adopts two different relaying strategies, namely, randomize-and-forward and decode-and-forward relaying, to improve the security of the legitimate system. In the first relaying strategy, Rooney uses a codebook different from that used at Alice. In the second relaying strategy, Rooney and Alice use the same codebooks. In addition, Rooney switches between the HD and FD modes to further enhance the security of the legitimate system. The numerical results demonstrate that our proposed scheme achieves a significant average secrecy end-to-end throughput improvement relative to the conventional bufferless FD relaying scheme.
We investigate the physical-layer security of a buffer-aided multiple-input multiple-output relay channel. The wireless network under investigation is composed of one legitimate source node (Alice), one legitimate half-duplex relay node, and one legitimate destination node (Bob). Alice communicates with both relay and Bob in the presence of a potential passive multi-antenna eavesdropper (Eve). Without knowing the instantaneous eavesdropper's channel state information at the legitimate nodes, we propose a precoded artificial-noise injection scheme to enhance the security of the legitimate transmissions. The relay is equipped with a finite buffer to store the unsuccessfully decoded packets at Bob. We analyze the Markov chain of the relay's queue and derive its steady-state distributions. Our optimization problem is formulated such that the average end-to-end secure throughput is maximized under the secrecy outage probability constraint on the Alice-relay link. Our numerical results demonstrate that our proposed buffer-aided relaying scheme achieves a significant improvement in the secure throughput compared with the conventional bufferless relaying scheme, where the time slot is divided equally between the source and the relay for their data transmissions.
Relaying is one of the useful techniques to enhance wireless physical-layer security. Existing literature shows that employing full-duplex relay instead of conventional half-duplex relay improves secrecy capacity and secrecy outage probability, but this is at the price of sophisticated implementation. As an alternative, two-path successive relaying has been proposed to emulate operation of full-duplex relay by scheduling a pair of half-duplex relays to assist the source transmission alternately. However, the performance of two-path successive relaying in secrecy communication remains unexplored. This paper proposes a secrecy two-path successive relaying protocol for a scenario with one source, one destination and two half-duplex relays. The relays operate alternately in a time division mode to forward messages continuously from source to destination in the presence of an eavesdropper. Analytical results reveal that the use of two half-duplex relays in the proposed scheme contributes towards a quadratically lower probability of interception compared to full-duplex relaying. Numerical simulations show that the proposed protocol achieves the ergodic achievable secrecy rate of full-duplex relaying while delivering the lowest probability of interception and secrecy outage probability compared to the existing half duplex relaying, full duplex relaying and full duplex jamming schemes.
We consider utilizing a buffer-aided relay to enhance security for two-hop half-duplex relay networks with an external eavesdropper. We propose a link selection scheme that adapts reception and transmission time slots based on the channel quality, while considering both the two-hop transmission efficiency and the security. Closed-form expressions for the secrecy throughput and the secrecy outage probability (SOP) are derived, and the selection parameters are optimized to maximize the secrecy throughput or minimize the SOP. We also study two sub-optimal link selection schemes that only require a line search to solve the optimization problem. Numerical results show that buffer-aided relaying provides a significant improvement in security compared to conventional unbuffered relaying.
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.
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.