On secrecy performance of mixed generalized Gamma and Málaga RF-FSO variable gain relaying channel

Islam, S. H., Badrudduza, A. S. M., Riazul Islam, S. M., Shahid, F. I., Ansari, I. S. , Kundu, M. K., Ghosh, S. K., Hossain, M. B., Hosen, A. S. M. S. and Cho, G. H. (2020) On secrecy performance of mixed generalized Gamma and Málaga RF-FSO variable gain relaying channel. IEEE Access, 8, pp. 104127-104138. (doi: 10.1109/ACCESS.2020.2998742)

Abstract

The emergence of an array of new wireless networks has led researchers to evaluate the prospect of utilizing the physical properties of the wireless medium in order to design secure systems. In this paper, the physical layer secrecy performance of a mixed radio frequency-free space optical (RF-FSO) system with variable gain relaying scheme is investigated in the presence of an eavesdropper. We assume that the eavesdropper can wiretap the transmitted confidential data from the RF link only. It is further assumed that the main and eavesdropper RF links are modeled as generalized Gamma (GG) fading channel, and the free space optical (FSO) link experiences Málaga turbulence with pointing error impairment. Our primary concern is to protect this confidential information from being wiretapped. Besides pointing error, the atmospheric turbulence and two types of detection techniques (i.e. heterodyne detection and intensity modulation with direct detection) are also taken into consideration. Utilizing amplify-and-forward (AF) scheme, the novel mathematical closed-form expressions for average secrecy capacity, lower bound of secrecy outage probability, and strictly positive secrecy capacity are derived. As both the links (RF and FSO) undergo generalized fading channels, the derived expressions are also general. We present a unification of some existing works utilizing the proposed model to better clarify the novelty of this work. Finally, all the derived expressions are justified via Monte-Carlo simulations.

• Item Type: Articles
• Additional Information: This work was supported in part by the Jeonbuk National University, in 2020, and in part by the Sejong University Research Faculty Program under Grant 20192021.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ansari, Dr Imran
• Authors: Islam, S. H., Badrudduza, A. S. M., Riazul Islam, S. M., Shahid, F. I., Ansari, I. S., Kundu, M. K., Ghosh, S. K., Hossain, M. B., Hosen, A. S. M. S., and Cho, G. H.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: IEEE Access
• Publisher: IEEE
• ISSN: 2169-3536
• ISSN (Online): 2169-3536
• Published Online: 29 May 2020
• Copyright Holders: Copyright © 2020 IEEE
• First Published: First published in IEEE Access 8:104127-104138
• Publisher Policy: Reproduced under a Creatives Commons License