A performance study of two hop transmission in mixed underlay RF and FSO fading channels

Ansari, Imran Shafique; Abdallah, Mohamed; Alouini, Mohamed‐Slim; Qaraqe, Khalid

doi:10.1109/wcnc.2014.6952039

Cited by 32 publications

(13 citation statements)

References 23 publications

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“…Although, multihop communication using multiple relays presents a solution to the long distance communication problem via FSO network, the immoderate expenditure of this network makes it less feasible for practical applications. As a result, researchers started exploring some other means of long distance communications with high data rates and came up with a brilliant idea of mixed RF-FSO network that has been investigated thoroughly in [14]- [30]. In a RF-FSO network, the long distance communication takes place via the RF channel whereas the first / last mile access is provided via the FSO communication system [14].…”

Section: B Related Workmentioning

confidence: 99%

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

et al. 2021

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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 α − µ 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 nonzero 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. INDEX TERMS α-µ fading, exponentiated Weibull fading, variable gain relay, physical layer security, average secrecy capacity, secrecy outage probability, probability of non-zero secrecy capacity.

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Section: B Related Workmentioning

confidence: 99%

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

et al. 2021

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“…Wireless communication beneath the water surface is being considered as a growing research opportunity in recent times. To date, different types of communication strategies have been explored for underwater communication (UWC) systems including acoustic communication (ACOMM) [1], electromagnetic communications [2], optical wireless com-munications [3], and laser communications [4], [5]. However, underwater optical wireless communication (UOWC) in the form of light beams generated by laser or LED devices has been proven to be the most promising medium due to its high capacity, inherent robust security, low latency, lower energy consumption, and resistance to water link impairments [6].…”

Section: Introduction a Background And Literature Studymentioning

confidence: 99%

Security at the Physical Layer Over GG Fading and mEGG Turbulence Induced RF-UOWC Mixed System

et al. 2021

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With the rapid evolution of communication technologies, high-speed optical wireless applications under the water surface as a replacement or complementary to the conventional radio frequency (RF) and acoustic technologies are attracting significant attention from the researchers. Since underwater turbulence (UWT) is an inevitable impediment for a long distance underwater optical wireless communication (UOWC) link, mixed RF-UOWC is being considered as a more feasible solution by the research community. This article deals with the secrecy performance of a variable gain relay-based mixed dual-hop RF-UOWC framework under the intercepting attempt of a potential eavesdropper. The RF link undergoes Generalized Gamma (GG) fading distribution, whereas the UOWC link is subjected to mixture Exponential Generalized Gamma (mEGG) distribution. The eavesdropper is capable of wiretapping via a RF link that also experiences the GG fading. The secrecy analysis incorporates the derivations of closed-form expressions for strictly positive secrecy capacity, average secrecy capacity, and exact as well as lower bound of secrecy outage probability in terms of univariate and bivariate Meijer's G and Fox's H functions. Based on these expressions, impacts of heterodyne and intensity modulation/direct detection techniques along with weak, moderate, and severe UWT conditions due to air bubbles, temperature, and salinity gradients are quantified. To the best of authors' knowledge, the proposed model is the first of its kind that addresses the secrecy analysis of a temperature gradient RF-UOWC system along with air bubbles, as opposed to the existing models that considered thermally uniform scenarios only. Finally, the derived expressions are verified via Monte-Carlo simulations.INDEX TERMS Eavesdropper, optical wireless communication, physical layer security, under water turbulence.

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“…RIS-assisted optical wireless communication networks were also gaining popularity where the RIS is utilized along with the optical networks in order to promote the system performance with an improved coverage [3], [8]. RIS was used as a promising solution for freespace optical (FSO) communications to overcome atmospheric turbulence problem and pointing error issues in [9]- [11]. The performance of RIS-empowered FSO system was demonstrated unifying Fisher-Snedecor (F), Gamma-Gamma (GG), and Málaga (M) distributions in [12].…”

Section: A Background and Literature Studymentioning

confidence: 99%

On the Physical Layer Security Performance over RIS-aided Dual-hop RF-UOWC Mixed Network

Hossain¹,

Shabab²,

Badrudduza³

et al. 2021

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Since security has been one of the crucial issues for high-yield communications such as 5G and 6G, the researchers continuously come up with newer techniques to enhance the security and performance of these progressive wireless communications. Reconfigurable intelligent surface (RIS) is one of those techniques that artificially rearrange and optimize the propagation environment of electromagnetic waves to improve both spectrum and energy efficiency of wireless networks. Besides, in underwater communication, underwater optical wireless communication (UOWC) is a better alternative/replacement for conventional acoustic and radio frequency (RF) technologies. Hence, mixed RIS-aided RF-UOWC can be treated as a promising technology for future wireless networks. This work focuses on the secrecy performance of mixed dual-hop RIS-aided RF-UOWC networks under the intercepting effort of a probable eavesdropper. The RF link operates under generalized Gamma fading distribution; likewise, the UOWC link experiences the mixture exponential generalized Gamma distribution. The secrecy analysis subsumes the derivations of closed-form expressions for average secrecy capacity, exact and lower bound of secrecy outage probability, and strictly positive secrecy capacity, all in terms of Meijer's G functions. Capitalizing on these derivations, the effects of heterodyne and intensity modulation/direct detection systems, underwater turbulence resulting from air bubble levels, temperature gradients, and salinity gradients, are measured. Unlike conventional models that merely deal with thermally uniform scenarios, this proposed model is likely to be unique in terms of dealing with secrecy analysis of a temperature gradient RIS-aided RF-UOWC network. Lastly, the derivations are validated via Monte-Carlo simulations.

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A performance study of two hop transmission in mixed underlay RF and FSO fading channels

Cited by 32 publications

References 23 publications

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

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

Security at the Physical Layer Over GG Fading and mEGG Turbulence Induced RF-UOWC Mixed System

On the Physical Layer Security Performance over RIS-aided Dual-hop RF-UOWC Mixed Network

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