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Secrecy performance analysis of NLOS ultraviolet communications over turbulence channels

Weifeng Mou, Tao Pu, Weiwei Yang, Yeteng Tan

Published Nov 15, 2018• 0 citations
Publisher

Abstract

This paper investigates the secure communication over Non-Line-of-Sight (NLOS) Ultraviolet (UV) links suffering from turbulence-induced fading, where the transmitter and the receiver or eavesdropper cone axes lie in the same plane or different planes and can be pointed in arbitrary directions. The closed-form expressions of the Average Secrecy Capacity (ASC), the Secrecy Outage Probability (SOP) and the Probability of Positive Secrecy Capacity (PPSC) are derived to evaluate the secrecy performance. Finally, simulation results are provided to verify the accuracy of our derivations and show the effect of transmission power and elevation angle on the ASC, SOP and PPSC.

DOI
10.1201/9780429447082-48

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This paper investigates the secure communication over Non-Line-of-Sight (NLOS) Ultraviolet (UV) links suffering from turbulence-induced fading, where the transmitter and the receiver or eavesdropper cone axes lie in the same plane or different planes and can be pointed in arbitrary directions. The closed-form expressions of the Average Secrecy Capacity (ASC), the Secrecy Outage Probability (SOP) and the Probability of Positive Secrecy Capacity (PPSC) are derived to evaluate the secrecy performance. Finally, simulation results are provided to verify the accuracy of our derivations and show the effect of transmission power and elevation angle on the ASC, SOP and PPSC.
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This work is concerned with the secrecy performance of a free-space optical (FSO) communication system over Fisher-SnedecorF\mathcal {F}F-distribution turbulence fading channel. Considering the influence of pointing error, atmospheric turbulence and different detection technique (i.e., the intensity modulation with direct detection and heterodyne detection), we derive the exact closed-form expressions for the average secrecy capacity (ASC), the secrecy outage probability (SOP) and the strictly positive secrecy capacity (SPSC) in terms of Meijer’s G-function. Furthermore, the asymptotic expression for SOP is analyzed as the electrical signal-to-noise ratio approaches infinity. Monte Carlo simulations are provided to validate analytical results.
Nowadays, the hybrid automatic retransmission request (H-ARQ) protocols are prevalent in fifth-generation (5G) and beyond communications. The utilization of H-ARQ protocols is extended to free-space optical (FSO) communication systems to achieve a reliable link. In this paper, we investigate the secrecy performance of chase combining (CC) H-ARQ protocol in the presence of an eavesdropper. We present the closed-form expressions of the average secrecy capacity (ASC) and secrecy outage probability (SOP) of FSO systems over atmospheric turbulence-induced fading channels and different rounds of H-ARQ transmission. We also derive the conditional SOP and secrecy throughput of the considered FSO system. The expressions are valid for weak to strong atmospheric turbulence, intensity modulation direct detection, and different number of H-ARQ rounds. We have also validated our proposed results using Monte Carlo simulations.
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In this article, we study the physical layer security of free-space optical (FSO) communications under different eavesdropping scenarios. More specifically, the secrecy performance of FSO communication employing intensity modulation/direct detection detection is analyzed for the well-established Málaga channels. Three different realistic scenarios of eavesdropping are considered by assuming different placement locations for the eavesdropper in the paper. Novel expressions for the average secrecy capacity (ASC) and secrecy outage probability (SOP) are derived for the considered scenarios, and useful insights are also provided through asymptotic analysis. The results show: (1) When the eavesdropper is placed near the transmitter, atmospheric condition imposes a less significant impact on secrecy performance; (2) Certain level of correlation can potentially enhance the secrecy performance for FSO communications; (3) The correlation imposes opposite impacts on the ASC and SOP of FSO communications; and the secrecy performance metrics exhibit a non-monotonic impact with the increase of correlation; (5) When the correlation of the FSO links is too small or too large (i.e., the correlation parameter around 0 or 1), the correlation plays a more significant impact on secrecy performance; and (6) The asymptotic slope of the SOP is 0.5 for all eavesdropping scenarios under practical FSO channels.