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Lecture notes in electrical engineering

Improving Physical Layer Security Using Artificial Noise for Buffer-Aided Relay Networks

Yajun Zhang, Huaming Wang, Wenli Shi

Published Jan 1, 2019• 0 citations
Publisher
DOI
10.1007/978-981-13-6264-4_5

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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.
In this work, we consider the use of buffer-aided relays, linear precoding techniques and multiple antennas for physical-layer security in wireless networks. We develop relay selection algorithms to improve the secrecy-rate performance of cooperative multi-user multiple-antenna wireless networks. In particular, we propose a novel finite buffer-aided relay selection algorithm that employs the maximum likelihood (ML) criterion to select sets of relays which fully exploit the flexibility offered by relay nodes equipped with buffers. Numerical results show the benefits of the proposed techniques as compared to prior art.
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.