On Secrecy Performance of Multiuser FSO Networks with Opportunistic User Scheduling

Shakir, Wafaa Mohammed Ridha

doi:10.1109/isncc52172.2021.9615862

Cited by 8 publications

(15 citation statements)

References 16 publications

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“…Such an assumption is unrealistic because users in a realworld system are likely to be spread out over a broad area. Furthermore, unlike RF systems, the fading variance in FSO systems is distance-dependent [12]; hence user placement has a significant influence on multiuser system performance. Zhalehpour and Uysal developed an accurate analysis for the outage capacity of several scheduling schemes including in an MU-MIMO FSO system over a weak turbulence channel [30].…”

Section: A Related Workmentioning

confidence: 99%

“…An additional group of studies explored the OSS for improving the security performance of the mixed RF/FSO and FSO systems against eavesdropping attacks [12], [42]- [44]. For example, Abd El-Malek et al investigated the security of MU-SIMO mixed RF-FSO relay networks by employing the BUS scheme in the multiuser RF link [42].…”

Section: ) Security Performance Enhancementmentioning

confidence: 99%

“…However, the SISO FSO link with Gamma-Gamma distribution is considered as an extension for the multiuser RF link in all these studies [42]- [44]. Finally, Shakir [12] examined the security performance of the MISO FSO networks adopting the BUS scheme. The Malaga-M turbulence is used to characterized the FSO channel with the same approximation method for the channel model adopted in [33].…”

Section: ) Security Performance Enhancementmentioning

confidence: 99%

“…It is worth noting that the SISO FSO transmission utilizing the general Malaga-M distribution to characterize atmospheric turbulence, has been intensively studied in many works in the literature to evaluate the performance of the FSO system over a wide range of turbulence conditions [45], [46]. However, very few works [12] have used the Malaga-M distribution in the multiuser FSO environment in the context of SRT due to the high complexity of the mathematical formulation of such systems.…”

Section: ) Security Performance Enhancementmentioning

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).…”

mentioning

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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Section: A Related Workmentioning

confidence: 99%

Section: ) Security Performance Enhancementmentioning

confidence: 99%

Section: ) Security Performance Enhancementmentioning

confidence: 99%

Section: ) Security Performance Enhancementmentioning

confidence: 99%

mentioning

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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Unified Performance Analysis for UAV-Based FSO Communication Systems

Shakir,

Abdulazeez,

Hamdan

et al. 2024

Proceedings of Ninth International Congress on Information and Communication Technology

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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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On Secrecy Performance of Multiuser FSO Networks with Opportunistic User Scheduling

Cited by 8 publications

References 16 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

Unified Performance Analysis for UAV-Based FSO Communication Systems

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

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