A high-speed integrated OFDM/DPS-OCDMA-based FSO transmission system: Impact of atmospheric conditions

Mehtab Singh; Somia A. Abd El-Mottaleb; Hassan Yousif Ahmed; Medien Zeghid; Kottakkaran Sooppy Nisar; Ameenah N. Al-Ahmadi; Mona Mahmoud

Alexandria Engineering Journal (Aug 2023)

A high-speed integrated OFDM/DPS-OCDMA-based FSO transmission system: Impact of atmospheric conditions

Mehtab Singh,
Somia A. Abd El-Mottaleb,
Hassan Yousif Ahmed,
Medien Zeghid,
Kottakkaran Sooppy Nisar,
Ameenah N. Al-Ahmadi,
Mona Mahmoud

Affiliations

Mehtab Singh: Department of Electronics and Communication Engineering, University Institute of Engineering, Chandigarh University, Mohali, Punjab, India
Somia A. Abd El-Mottaleb: Alexandria Higher Institute of Engineering and Technology, Alexandria, Egypt
Hassan Yousif Ahmed: Department of Electrical Engineering, College of Engineering in Wadi Alddawasir, Prince Sattam bin Abdulaziz University, Saudi Arabia
Medien Zeghid: Department of Electrical Engineering, College of Engineering in Wadi Alddawasir, Prince Sattam bin Abdulaziz University, Saudi Arabia; Electronics and Micro-Electronics Laboratory (E. μ. E. L), Faculty of Sciences, University of Monastir, Tunisia
Kottakkaran Sooppy Nisar: Department of Mathematics, College of Science and Humanities in Alkharj, Prince Sattam bin Abdulaziz University, Al Kharj, Saudi Arabia; Corresponding author.
Ameenah N. Al-Ahmadi: Department of Physics, Faulty of Applied Sciences, Umm Al-Qura University, Makkah 24382, Saudi Arabia
Mona Mahmoud: Department of Physics, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia

Journal volume & issue: Vol. 77
pp. 15 – 29

Abstract

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Free space optics (FSO) communication systems are preferred due to their high transmission capacity so it can support the ever-increasing volume of online traffic. Optical code division multiple access (OCDMA) is ideal for enhancing capacity by utilizing the same wavelengths for different information transmission. This paper presents a new FSO system based on the combination of orthogonal frequency division multiplexing (OFDM) and OCDMA systems. Three OCDMA channels, employing diagonal permutation shift (DPS) codes, carry 20 Gbps each, modulated by 4-level quadrature amplitude modulation (QAM) and OFDM. To assess performance, the proposed system considers severe climate conditions like rain, fog, and snow. The effectiveness is measured by bit error rate (BER) and received optical power (ROP). In addition, actual meteorological data for the cities of Alexandria, Egypt and Pune, India are evaluated to demonstrate the applicability of the proposed model in a real-world setting. The results reveal successful transmission with an overall capacity of 60 Gbps over a 3600 m FSO range in Alexandria, achieving a 0.27 dBm ROP. In Pune, with higher average rainfall, the maximum FSO link is 2750 m with a −0.06 ROP. Furthermore, the proposed model can propagate up to 850 m under weak turbulence (WT).

Published in Alexandria Engineering Journal

ISSN: 1110-0168 (Print); 2090-2670 (Online)
Publisher: Elsevier
Country of publisher: Egypt
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/alexandria-engineering-journal/

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