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IEEE Wireless Communications Letters

Enhancing the PHY-Layer Security of MIMO Buffer-Aided Relay Networks

Ahmed El Shafie, Dusit Tao Niyato, Naofal Al‐Dhahir

Published May 18, 2016• 23 citations
Publisher

Abstract

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.

DOI
10.1109/lwc.2016.2569526

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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.
This letter studies the physical-layer security of a full-duplex (FD) multiple-input multiple-output relay channel. A legitimate source node (Alice) communicates with her destination node (Bob) through an FD relay node in the presence of a cooperative FD jammer and a potential eavesdropper (Eve). The cooperative jammer is assumed to be an FD node that is solely charged by the ambient radio-frequency transmissions. We investigate the self-energy recycling at the cooperative jammer and derive a sufficient condition for the cooperative jammer to operate as a node with reliable energy supply. Without knowing the eavesdropper's channel state information at the legitimate nodes, we propose a precoded artificial-noise (AN) injection scheme to secure the legitimate transmissions. The numerical results demonstrate that our proposed AN-aided secure scheme achieves a significant average secrecy rate improvement compared with the case of no cooperative jammer.
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.
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.
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.
In this paper, we investigate opportunistic relay and jammer cooperation schemes in multiple-input multiple-output (MIMO) buffer-aided relay networks. The network consists of one source, an arbitrary number of relay nodes, legitimate users and eavesdroppers, with the constraints of physical layer security. We propose an algorithm to select a set of relay nodes to enhance the legitimate users' transmission and another set of relay nodes to perform jamming of the eavesdroppers. With Inter-Relay interference (IRI) taken into account, interference cancellation can be implemented to assist the transmission of the legitimate users. Secondly, IRI can also be used to further increase the level of harm of the jamming signal to the eavesdroppers. By exploiting the fact that the jamming signal can be stored at the relay nodes, we also propose a hybrid algorithm to set a signal-to-interference and noise ratio (SINR) threshold at the node to determine the type of signal stored at the relay node. With this separation, the signals with high SINR are delivered to the users as conventional relay systems and the low SINR performance signals are stored as potential jamming signals. Simulation results show that the proposed techniques obtain a significant improvement in secrecy rate over previously reported algorithms.
In this paper, we investigate opportunistic relay and jammer cooperation schemes in multiple-input multiple-output (MIMO) buffer-aided relay networks. The network consists of one source, an arbitrary number of relay nodes, legitimate users and eavesdroppers, with the constraints of physical layer security. We propose an algorithm to select a set of relay nodes to enhance the legitimate users' transmission and another set of relay nodes to perform jamming of the eavesdroppers. With Inter-Relay interference (IRI) taken into account, interference cancellation can be implemented to assist the transmission of the legitimate users. Secondly, IRI can also be used to further increase the level of harm of the jamming signal to the eavesdroppers. By exploiting the fact that the jamming signal can be stored at the relay nodes, we also propose a hybrid algorithm to set a signal-to-interference and noise ratio (SINR) threshold at the node to determine the type of signal stored at the relay node. With this separation, the signals with high SINR are delivered to the users as conventional relay systems and the low SINR performance signals are stored as potential jamming signals. Simulation results show that the proposed techniques obtain a significant improvement in secrecy rate over previously reported algorithms.