Enhancement of the Performance of a VLC system using Hybrid OTDM/WDM technique

Kharbouche, Anass; Madini, Zhour; Zouine, Y.; Amrani, Aumeur El

doi:10.1109/icoa.2019.8727657

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Where: − ℎ(0): is the channel DC gain − 𝑃 𝑖 : is the transmitted optical power In order to model as devotedly as possible, the VLC channel, we should correspondingly include the ambient light noise with the line of side channel model. The receiver noise is mainly considered by the particularities of the photo-detector and the electric pre-amplifier [15]. It is composed of several sources: −…”

Section: Outdoor Vlc Systemmentioning

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: Outdoor Vlc Systemmentioning

confidence: 99%

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

2023

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“…The VLC is a growing technology and is an open research area. Many complex communication systems like integration of VLC and Wi-Fi, 40 integration of wavelength division multiplexing with Optical Time Division Multiplexing (OTDM), 41 and securing VLC links against unauthorized eavesdropping of MISO system 42 are being carried out. Thus, the VLC systems are becoming more secure and feasible with the advancement of technology.…”

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confidence: 99%

Compressed sensing channel estimation for STBC‐SM based hybrid MIMO‐OFDM system for visible light communication

Manur

Ali

2020

Int J Communication

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Summary This paper presents the idea of sparse channel estimation using compressed sensing (CS) method for space–time block coding (STBC), and spatially multiplexing (SM) derived hybrid multiple‐input multiple‐output (MIMO) Asymmetrically clipped optical‐orthogonal frequency division multiplexing (ACO‐OFDM) optical wireless communication system. This hybrid system accounts multiplexing gain of SM and diversity gain of STBC technique. We present a new variant of sparsity adaptive matching pursuit (SaMP) algorithm called dynamic step‐size SaMP (DSS‐SaMP) algorithm. It makes use of the inherent and implicit structure of SaMP, along with dynamic adaptivity of step‐size feature which is compatible with the energy of the input signal, thus the name dynamic step size. Existing CS‐based recovery algorithms like orthogonal matching pursuit, SaMP, adaptive step‐size SaMP, and proposed DSS‐SaMP were compared for hybrid MIMO‐ACO‐OFDM visible light communication system. The performance analysis is demonstrated through simulation results with respect to bit error rate, symbol error rate, mean square error, computational complexity, and peak‐to‐average power ratio. Simulation results show that the proposed technique gives improved performance and lesser computational complexity in comparison with conventional estimation algorithms.

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