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arXiv:1704.03387 · Wireless Personal Communications

Enhancement of Physical Layer Security Using Destination Artificial Noise Based on Outage Probability

Ali Rahmanpour, Vahid Tabataba Vakili, S. Mohammad Razavizadeh

Published Nov 4, 2016• 6 citations
arXivHTMLPDF
DOI
10.1007/s11277-016-3865-9

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The authors employ the artificial noise (AN) technique to enhance physical layer security (PLS) in one-way full-duplex (OWFD) networks. Specifically, an OWFD network incorporating AN and operating over Rayleigh fading channels is considered. The system consists of five nodes: a source node, a destination node, a relay node, an eavesdropper node, and a jamming node. To evaluate security performance, the authors analyze and assess several metrics, including the secrecy outage probability (SOP), secrecy throughput (STP), and the trade-off between outage probability (OP) and intercept probability (IP). Closed-form expressions are derived in the paper. The analytical results are validated through Monte Carlo simulations implemented in MATLAB, the results are illustrated through four graphs: the impact of the artificial-noise node’s position on the SOP under variations in the source node’s transmit power; the effect of the eavesdropper’s position; and the influence of the path-loss exponent on the system’s OP, IP, and SOP. In addition, a comparative graph of the SOP between the proposed model and the reference model is presented. All graphs demonstrate a significant improvement in security performance compared with previous studies. The proposed model confirms the feasibility of implementing PLS solutions in OWFD networks.
Low density parity check (LDPC) code and artificial noise are combined in wiretap channel to enhance the security in physical layer. Artificial noise is added at the transmitter using pre-coding. The artificial noise is designed that it spans a null space at the legitimate receiver but acts as random interference at the eavesdropper receiver. Moreover, a scrambling matrix is designed and then used in LDPC code to enhance the physical layer security. The outage probability of the wiretap channel is deduced, and then used in outage probability minimization. The performance of the proposed scheme is demonstrated with simulations.
In this paper, we first propose a joint user and relay selection (JURS) scheme to enhance physical layer security in a multi-user multi-relay network, where the best pair of the user and relay that maximizes the user-to-destination signal-to-interference-to-noise ratio (SINR) is jointly selected. We analytically examine the secrecy outage probability (SOP) of this scheme, based on which the optimal power allocation between the useful signal and artificial noise at the users is determined in order to minimize the corresponding SOP. To avoid the high complexity of the joint selection, we also propose a separate user and relay selection (SURS) scheme, where one relay is firstly selected to maximize the relay-to-destination SINR and a user is then selected to maximize the SINR from the user to the selected relay. We also derive the SOP of the SURS scheme and determine the corresponding optimal power allocation. As expected, the JURS scheme can outperform the SURS scheme. However, our examination also indicates that the low-complex SURS scheme can achieve similar secrecy performance as the high-complex JURS scheme under some specific conditions, e.g., when the number of users is much larger than that of the relays or when the average signal-to-noise ratio of user-to-relay channel is much higher than that of the relay-to-destination channel.