Secrecy Performance Analysis of Mixed α − μ and Exponentiated Weibull RF-FSO Cooperative Relaying System

IEEE Access

S. M. Riazul Islam¹  Milton Kumar Kundu²  Sheikh Habibul Islam³  A. S. M. Badrudduza⁴  Nazmul Hassan Juel⁴  Md. Munjure Mowla⁴  Imran Shafique Ansari⁵  Kyung-Sup Kwak⁶ 

[1] Department of Computer Science and Engineering, Sejong University, Seoul, South Korea;Department of Electrical and Computer Engineering, Rajshahi University of Engineering and Technology (RUET), Rajshahi, Bangladesh;Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology (RUET), Rajshahi, Bangladesh;Department of Electronics and Telecommunication Engineering, Rajshahi University of Engineering and Technology (RUET), Rajshahi, Bangladesh;James Watt School of Engineering, University of Glasgow, Glasgow, U.K.;School of Information and Communication Engineering, Inha University, Incheon, South Korea;

关键词: α-μ fading;    exponentiated Weibull fading;    variable gain relay;    physical layer security;    average secrecy capacity;    secrecy outage probability;   

DOI  :  10.1109/ACCESS.2021.3078610

来源: DOAJ

【 摘 要 】

Increasing concerns regarding wireless systems’ security are leading researchers to exploit the physical properties of a medium while designing any secured wireless network. The secrecy performance of a mixed radio frequency-free space optical (RF-FSO) system with a variable gain relaying scheme is investigated in this paper under the attempt of wiretapping by an eavesdropper. We assume that the eavesdropper can intrude the target data from the RF link only. Both the RF links (main and eavesdropper) undergo the $\alpha -\mu $ fading statistics and the FSO link experiences the exponentiated Weibull fading statistics. Exploiting the amplify-and-forward (AF) relaying scheme while considering two detection techniques (i.e. heterodyne detection and intensity modulation/direct detection) with pointing error impairments, the mathematical formulations of the unified probability density function and cumulative distribution function are performed for the equivalent signal-to-noise ratio of the considered dual-hop RF-FSO link. Closed-form analytical expressions for average secrecy capacity, secrecy outage probability, and the probability of non-zero secrecy capacity are derived in terms of Meijer’s $G$ and Fox’s $H$ functions to quantify the system performance. Capitalizing on these expressions, the secrecy performance is further analyzed for various channel parameters of RF links, aperture sizes of the receiver, pointing errors, and atmospheric turbulence severity. The results reveal that aperture averaging can improve the secrecy performance remarkably by suppressing the effects of turbulence. Monte Carlo simulations are provided to justify the accuracy of the proposed model.

【 授权许可】

Unknown