# Fuzzy Logic-Based Performance Enhancement of FSO Systems Under Adverse Weather Conditions
## 3 Fuzzy Modeling for Enhancing Receiver Performance in FSO System
### Adaptive BER Threshold Adjustment Mechanism for FSO-FLC-OCDMA Receivers
For future work, we will extend the FSO-FLC model to address atmospheric turbulence and analyze its impact on beam propagation and the received signal power to enhance BER threshold adaptation. Figure 21: Number of active users vs. BER under HF weather conditions. **Author Contributions:** Conceptualization, H.Y.A. and M.Z. ; methodology, H.Y.A. and M.Z. ; software, M.Z. and A.N.K. ; validation, H.Y.A. and S.A.A.E.-M.; formal analysis, H.Y.A., M.Z., and A.N.K. ; investigation, A.N.K. and S.A.A.E.-M.; resources, H.Y.A. ; data curation, M.Z. and S.A.A.E.-M.; writing--original draft preparation, H.Y.A., M.Z., and S.A.A.E.-M.; writing--review and editing, A.N.K. ; visualization, M.Z. ; supervision, H.Y.A. ; project administration, H.Y.A. ; funding acquisition, M.Z. All authors have read and agreed to the published version of the manuscript. This research was funded by Prince Sattam Bin Abdulaziz University under Project PSAU/2024/01/29746. Not applicable. Data availability Statement: Data are contained within the article. The authors extend their appreciation to Prince Sattam bin Abdulaziz University for funding this research work through the project number (PSAU/2024/01/29746). The authors declare no conflicts of interest. ## Abbreviations

The following abbreviations are used in this manuscript: \begin{tabular}{l l} OCDMA & Optical Code-Division Multiple-Access \\ FSO & Free-Space Optics \\ FLC & Fuzzy Logic Control \\ BER & Bit Error Rate \\ OWC & Optical wireless communication \\ RF & Radio Frequency \\ OFDM & Orthogonal Frequency Multiplexing \\ WDM & wavelength division multiplexing \\ SAC & Spectral Amplitude Coding \\ ONoC & Optical Network-on-chip \\ SSM & Single Sigma Matrix \\ \end{tabular} 

## References

* (1) [PERSON]; [PERSON] _Advanced Optical Wireless Communication Systems_; Cambridge University Press: Cambridge, UK, 2012. * (2) [PERSON]; [PERSON]; [PERSON] Analysis of fog effects on terrestrial Free Space Optical communication links. In Proceedings of the 2016 IEEE International Conference on Communications Workshops (ICC), Kuala Lumpur, Malaysia, 23-27 May 2016; pp. 151-156. * (3) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Toward converged satellite/fiber 1550 nm DS-BB84 QKD networks: Feasibility analysis and system requirements. _Photonics_**2024**, _11_, 609. [CrossRef]
* (4) [PERSON]; [PERSON]; [PERSON] Weather effects on hybrid FSO/RF communication link. _IEEE J. Sel. Areas Commun._**2009**, _27_, 1687-1697. [CrossRef]
* (5) [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] Free space optical communication system under different weather conditions. _J. Opt. Commun._**2023**, _44_, 103-110. [CrossRef]
* (6) [PERSON]; [PERSON] Optical communication in space: Challenges and mitigation techniques. _IEEE Commun. Surv. Tutor._**2016**, _19_, 57-96. [CrossRef]
* (7) [PERSON]; [PERSON]; [PERSON]; [PERSON] Atmospheric propagation of space-fractional Gaussian-beam waves in a FSO communication system. _Opt. Express_**2022**, _30_, 1570. [CrossRef] [PubMed]
* (8) [PERSON]; [PERSON]; [PERSON] [PERSON] Realization of free space optics with OFDM under atmospheric turbulence. _Optik_**2014**, _125_, 5196-5198. [CrossRef]
* (9) [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] The effect of weather on free space optics communication (FSO) under tropical weather conditions. In Proceedings of the International Conference on Computer and Communication Engineering (ICCCE'10), Kuala Lumpur, Malaysia, 11-12 May 2010. * (10) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Optimization of free space optics parameters: An optimum solution for bad weather conditions. _Optik_**2013**, _124_, 3969-3973. [CrossRef]
* (11) [PERSON]; [PERSON] Survey on free space optical communication: A communication theory perspective. _IEEE Commun. Surv. Tutor._**2014**, _16_, 2231-2258. [CrossRef]
* (12) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]. Development of SAC OCDMA in FSO with multi-wavelength laser source. _Opt. Commun._**2015**, _356_, 282-289.