Construction and Analysis of Novel 2-D Optical Orthogonal Codes Based on Extended Quadratic Congruence Codes and Modified One-Coincidence Sequence

Ji, Jianhua; Li, Wenjun; Zheng, Hongxia

doi:10.1515/joc-2015-0050

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Numerus unipolar orthogonal codes and their application on OCDMA have been studied since 1988. Two categories of those codes have attracted the most attention: OOC and prime codes (PC) [9], [10]. Optical orthogonal codes, described by [11], possess better properties of auto and inter-correlation than prime codes, as they require complex algorithms to generate [11].…”

Section: Ds-ocdmamentioning

confidence: 99%

Performance improvements of a VLC system, in a V2X context, using a different multiplexing technique

2023

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This paper scrutinizes visible light communication (VLC) employing hybrid optical time division multiplexing (OTDM) wavelength division multiplexing (WDM). It also demonstrates the simulation of VLC using the direct sequence optical code division multiple access (DS-OCDMA) system developed by OptiSystem-Matlab Co-simulation. The profits of WDM and OTDM capacities have been combined using two levels of freedom to build up of the system. The performances are demonstrated in the simulated findings of the bit error rate (BER) in relationship with the data rate and the number of users. First, the simulated results display the usefulness of the system. Then, the number of users has been significantly enhanced. Besides, the OCDMA functions by appointing a specific code to each user and could provide asynchronous and simultaneous access to numerous users. One drawback is multiple access interference (MAI). The use of very long code sequences is crucial in order to lessen this effect. Hence, very large bandwidths are essential. This study aims at demonstrating, through system simulation, the practicability of an all-optical conventional correlation receiver dedicated to a DS-OCDMA access network link. Again, OptiSystem has been used to realize our blocks.

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Section: Ds-ocdmamentioning

confidence: 99%

Performance improvements of a VLC system, in a V2X context, using a different multiplexing technique

2023

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Fog's Impact on Naval Free Space Optics Communications Links: A Comprehensive Investigation

Amine,

Nabil

2024

2024 International Telecommunications Conference (ITC-Egypt)

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Deployment of multiservice code in FSO-based hybrid subcarrier system

Alnassar

Mohammed

Taiwo

et al. 2022

Journal of Optical Communications

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This research aims to investigate and improve multi-user free space optic systems (FSO) based on a hybrid subcarrier multiplexing spectral amplitude coding-optical code division multiple access (SCM-SAC-OCDMA) technique using MS code with a direct decoding technique. The performance is observed under different weather conditions including clear, rain, and haze conditions. The investigation includes analyzing the proposed system mathematically using MATLAB and OptiSystem software. The simulation is carried out using a laser diode. Furthermore, the performances of the MS code in terms of angles of bit rate, beam divergence and noise are evaluated based on bit error rate (BER), received power, and transmission distance. The performance of the MS code-based system was subsequently compared with Khazani Syed code (KS), multi-diagonal (MD), and modified quadratic congruence code (MQC) codes under different weather conditions at a bit rate of 1 Gb/s and BER threshold of 10−9. Heavy rain indicates the worst performance in terms of transmission distance of 0.9 km. Nevertheless, the system designed using the MS code outperformed the KS, MD and MQC systems as it is capable of supporting up to 6.3, 0.8, 0.9, and 1.5 km, respectively, under clear weather. In conclusion, this study provides a means of improving FSO communications that suits tropical and Malaysia weather conditions.

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Construction and Analysis of Novel 2-D Optical Orthogonal Codes Based on Extended Quadratic Congruence Codes and Modified One-Coincidence Sequence

Cited by 3 publications

References 6 publications

Performance improvements of a VLC system, in a V2X context, using a different multiplexing technique

Performance improvements of a VLC system, in a V2X context, using a different multiplexing technique

Fog's Impact on Naval Free Space Optics Communications Links: A Comprehensive Investigation

Deployment of multiservice code in FSO-based hybrid subcarrier system

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