Effective secrecy throughput analysis of relay-assisted free-space optical communications

Monteiro, Marcos Eduardo Pivaro; Rebelatto, João Luiz; Souza, Richard Demo; Brante, Glauber

doi:10.1016/j.phycom.2019.100731

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…where, 𝑓 I (𝐼, 𝑘, 𝜃) = 9 >(R)S 3 𝐼 R+9 𝑒 +Q S ⁄ stands for the gamma PDF with shape parameter 𝑘 and scale parameter 𝜃. In (10) and (11),…”

Section: Statistics Analysis Of Tas Opportunisticmentioning

confidence: 99%

“…For example, in a typical wiretap model, PLS theory states that secure communication is possible if the capacity of the legitimate channel is higher than that of the eavesdropping channel. Motivated by the PLS schemes of RF systems, various PLS techniques have been proposed to secure FSO communications, such as diversity approaches [10], [11], transmit aperture selection (TAS) [12], artificial noise injection [13], and generalized chaotic modulation [14]. However, many characteristics of FSO systems differ from RF systems (e.g., the channel, and the physical characteristics of the transmitting and receiving devices).…”

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confidence: 99%

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Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

Shakir

Charafeddine²,

Satai³

et al. 2023

IEEE Photonics J.

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The security and reliability of free space optical (FSO) communications and the trade-off between the two are the most critical characteristics to emphasize in FSO systems, especially as optical wireless communications continue to evolve. In this work, we investigate the impact of opportunistic transmit aperture selection (TAS) on the security-reliability trade-off (SRT) of the multiuser multiple-input multiple-output (MU-MIMO) free space optical system. We consider a general scenario in which the FSO system consists of a transmitter side with 𝑲 users and a single receiver with 𝑵 apertures communicating over generalized Malaga-M turbulence channels. We derive the TAS combined signal-to-noise ratio (SNR) distributions for the FSO MIMO channel between the transmitting users and the receiver. A statistical analysis of the TAS scheme is performed, where the 𝒌th best user with the highest SNR is selected. Based on this analysis, the closed-form expressions for the outage probability, average bit error rate, intercept probability, and SRT are derived. Then, the diversity advantages provided by the channel variations considering the atmospheric turbulence and generalized nonzero boresight pointing errors are further discussed. The results show that the considered TAS significantly improves the security, reliability, and SRT performance and has the potential to solve existing FSO communication problems. Monte Carlo simulations are used to verify the correctness of the numerical results.

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“…where, 𝑓 I (𝐼, 𝑘, 𝜃) = 9 >(R)S 3 𝐼 R+9 𝑒 +Q S ⁄ stands for the gamma PDF with shape parameter 𝑘 and scale parameter 𝜃. In (10) and (11),…”

Section: Statistics Analysis Of Tas Opportunisticmentioning

confidence: 99%

mentioning

confidence: 99%

Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

Shakir

Charafeddine²,

Satai³

et al. 2023

IEEE Photonics J.

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“…Under two different weather situations, the authors of [30] compare the effective secrecy throughput of legal links and multi eavesdroppers with multiple-input-multiple-output relay supported. When the transmitter instantaneous CSI of the legitimate channel is available, the effect of using multiple relays on EST performance was investigated using two mechanisms: adaptive scheme with selective relaying, and fixed rate with all-active relaying, when the instantaneous CSI is not available at the transmitter [30].A framework for the secrecy analysis of a terrestrial FSO link considering the eavesdropper's location, under misalignments and atmospheric turbulence conditions is established in [31]. From a security standpoint, the IM/DD FSO system with CV-QKD technique was investigated [31].…”

Section: Physical Layer Security Techniques In Fso Systemsmentioning

confidence: 99%

A Survey on Physical Layer Security for FSO Communication Systems

Shakir¹,

Abdulkareem²

2022

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9

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Physical layer security (PLS), which uses information-theoretic techniques to protect data secrecy, has recently received a lot of academic attention. As wireless communications progresses to 5G and beyond, physical layer security research faces new hurdles. Because existing Radio-Frequency (RF) networks are unable to meet increasing data rate demands, optical wireless communication (OWC) based on free-space optical (FSO) techniques has been proposed as a viable approach to overcome RF spectrum limitations. Because of the small coverage offered by the narrow optical beam and the fact that they work properly only in the presence of line-of-sight components, FSO networks are more secure and less sensitive to eavesdropping than RF networks. However, the presence of an aggressive eavesdropper may undermine the secrecy performance of FSO networks. This document summarises all of the research that has been done on physical layer security in free space optical networks. In addition, the study suggests a number of open problems in these networks in order to improve and optimise security performance.

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“…For example, to evaluate the efficiency and availability of FSO links under different weather conditions, a fourchannel dense wavelength division multiplexing (DWDM) scheme is proposed in [14], while return to zero (RZ) and non-return to zero (NRZ) modulation formats are used for the single FSO link in [15]. In addition, several securing approaches have been proposed for FSO systems inspired by the recent advances in PLS in the RF counterparts, including diversity methods [16], [17], transmit aperture selection (TAS) [18], artificial noise injection [19], and chaotic waveform modulation [20]. In another study [21], the PLS performance of the FSO system was analyzed considering the effects of correlated Malaga-M FSO links.…”

mentioning

confidence: 99%

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

Shakir

Charafeddine²,

Hamdan

et al. 2023

IEEE Access

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The security-reliability tradeoff (SRT) in free-space optical (FSO) communications is the most critical property to highlight, especially with respect to the development of wireless optical communications. In this paper, opportunistic scheduling selection techniques are used to improve the SRT of multiuser FSO systems under the combined influence of atmospheric turbulence with Fisher-Snedecor F distribution, generalized pointing error, and path losses due to foggy weather. Due to the broadcast nature of wireless optical propagation, the optical transmission from the transmitting users to the legitimate receiver can be easily intercepted by eavesdroppers. Therefore, an optimal user scheduling (OUS) scheme is proposed in this work to protect the legitimate wireless transmission from eavesdroppers, where a user with the highest secrecy capacity is scheduled to transmit his confidential information to the receiver. Closed-form expressions for the outage probability, interception probability, and SRT are derived for the conventional round-robin scheduling (RRS) and the proposed OUS. In addition, an asymptotic analysis for the outage probability, interception probability, and SRT is performed to provide insight into the impact of user scheduling on the system performance. We also propose the use of ''friendly jamming'' techniques, where the user with the lowest secrecy capacity is selected by the authorized receiver to jam the existing interceptor. Finally, another SRT is formulated to determine the impact of a friendly jammer on the secrecy performance of the system. The results show that the proposed OUS outperforms the RRS in terms of intercept probability and SRT performance. The obtained exact and asymptotic results are validated by Monte-Carlo simulations.

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Effective secrecy throughput analysis of relay-assisted free-space optical communications

Cited by 7 publications

References 33 publications

Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

A Survey on Physical Layer Security for FSO Communication Systems

Security-Reliability Tradeoff Analysis for Multiuser FSO Communications over a Generalized Channel

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