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Journal of Military Science and Technology

Achieving zero secrecy outage in amplify-and-forward relaying systems

Huynh Huy Cuong, Nguyễn Mạnh Hùng, Nguyen Thi Ngoc Thuy, Ta Quang Hien

Published Apr 1, 2024• 0 citations
Publisher

Abstract

A proposed artificial noise (AN) injection strategy is considered in amplify-and-forward (AF) relaying systems. The limit of secrecy rate, hence the resulting zero-outage secrecy throughput, is determined subject to guarantee zero secrecy outage toward any powerful eavesdropper. The results show that the proposed simple strategy can achieve zero secrecy outage, which cannot be achieved in literature, and that it is easy to apply in wireless networks. The results also show an important finding: increasing throughput against increasing transmit power in secrecy.

DOI
10.54939/1859-1043.j.mst.capiti.2024.89-96

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A proposed artificial noise (AN) injection strategy is considered in amplify-and-forward (AF) relaying systems. The limit of secrecy rate, hence the resulting zero-outage secrecy throughput, is determined subject to guarantee zero secrecy outage toward any powerful eavesdropper. The results show that the proposed simple strategy can achieve zero secrecy outage, which cannot be achieved in literature, and that it is easy to apply in wireless networks. The results also show an important finding: increasing throughput against increasing transmit power in secrecy.
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The paper proposes a novel artificial noise (AN) injection strategy in multiple-input single-output multiple-antenna-eavesdropper (MISOME) systems under imperfect channel estimation at the legitimate channel to achieve zero secrecy outage probability under any circumstance. The zero secrecy outage is proved to always be achievable regardless of the eavesdropper's number of antennas or location when the pair secrecy and codeword rates are chosen properly. The results show that when there is perfect channel state information, the zero-outage secrecy throughput increases with the transmit power, which is important for secrecy design. Additionally, an analysis of the secrecy throughput and secrecy energy efficiency gives further insight into the effectiveness of the proposed scheme.
This paper proposes a three-phase transmission scheme to ensure zero secrecy outage in decode-and-forward relay systems by using the strategies of artificial noise (AN) injection and channel state information (CSI) leakage avoidance. The zero-outage secrecy spectral efficiency (ZOSSE) and energy efficiency (ZOSEE) of the scheme are then analyzed. Finally, the paper demonstrates that the scheme can always achieve zero secrecy outage even when the eavesdropper has an unlimited number of antennas or is in an arbitrary location, which shows its practical applicability. The paper also shows that the ZOSSE increases with the transmit power and that both the ZOSSE and the ZOSEE are maximized when the relay is halfway between the transmitter and the receiver. This suggests that the placement of the helper node is important in securing the communication of two distant nodes.
Cooperative relaying and cooperative jamming have been used to improve the secrecy of wireless networks. In this paper, Artificial Noise (AN) based secrecy enhancement of a dual-hop wireless network consisting of ‘n’ amplify-and-forward (AF) relays in the presence of a passive eavesdropper (E) is studied. A practical setting where direct links exist between source-destination (S-D) and source-eavesdropper (S-E) is considered. The source allocates some of its available power to transmit AN in order to confuse the eavesdropper and thereby degrades its channel. The optimum power allocation factor (a) and maximum secrecy rate are estimated analytically and by simulation. The performance is evaluated based on secrecy rate (Rs) and bit error rate (BER); for the case of randomly distributed relays and for any eavesdropper location. Numerical results show the improvement of the proposed cooperative scheme over other schemes.
The achievable secrecy rate of a dual-hop amplify-and-forward relaying system, in the presence of an eavesdropper, is investigated based on the different values of the wireless links' signal-to-noise ratios (SNRs). It is shown that when the direct link to the eavesdropper is in a better condition than the direct link to the destination, but the relaying link for the destination is better than the relaying link for the eavesdropper, under specific conditions for the links SNRs, it is possible to achieve the secrecy rate for a limited range of the relay power. On the other hand, when the direct link to the destination is better than the direct link to the eavesdropper, under certain conditions for the links' SNRs, it is not always beneficial to employ the relay, since there exists a limited range of relaying power for which secrecy rate is not achievable. Finally, it is shown that the source transmit power has no impact on the secrecy rate achievability. Simulation results confirm the theoretical analysis carried out in this letter.
In this paper the cooperation of beam-forming and artificial noise (AN) in two-hop amplify-and- forward (AF) relaying system is proposed to enhance the security. we consider a half duplex AF relaying network with a multi-antenna source node and a destination in the presence of a passive eavesdropper.Since channel state information (CSI) of the eavesdropper is unknown, the AN transmitted by the source in the first phase and by the relays in the second phase is in all directions except the legitimate node one. As such two scenarios are considered here,: i) when all the relays amplify and forward the information source signal ii) when only the best relay is selected to amplify and forward the information source signal. The beam-former weights and the power allocation are obtained by solving an optimization problem. Results reveal that the proposed system can provide considerable improvements in terms of secrecy rate. It is also found that increasing the AN power, relative to the information signal power, will further improve the secrecy rate.