On Performance Analysis of Cooperative Horizontal and Vertical Underwater VLC Systems with Best Relay Selection

In this paper, we consider cooperative horizontal and vertical underwater visible light communication (UWVLC) systems employing best relay selection. In the vertical UWVLC system, the source is placed at the sea surface and the destination is placed at a depth of 60 m. The link between the source an...

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Bibliographic Details
Published in:Photonics 2023-04, Vol.10 (4), p.429
Main Authors: Sharma, Rachna, Trivedi, Yogesh N., Garg, Kamal K., Bhatia, Vimal, Abdel-Hafez, Mohammed
Format: Article
Language:English
Subjects:
Analysis
Communications systems
Environmental conditions
ergodic capacity
log-normal distribution
Mathematical models
Normal distribution
Optical communication
outage probability
Parameters
Random variables
Refractivity
Relay
Salinity
Signal to noise ratio
Statistical analysis
Turbulence
Underwater
Underwater communication
underwater visible light communication (UWVLC)
Wireless communications
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Summary:In this paper, we consider cooperative horizontal and vertical underwater visible light communication (UWVLC) systems employing best relay selection. In the vertical UWVLC system, the source is placed at the sea surface and the destination is placed at a depth of 60 m. The link between the source and the destination is modeled as concatenated layers considering inhomogeneous environmental conditions. The underwater parameters change with depth, causing a variable refractive index, which leads to non-uniform optical turbulence. The horizontal communication link is analyzed for two different levels of turbulence at 10 m and 50 m depths. Turbulence is modeled using a log-normal distribution, whose statistical parameters depend on the temperature and salinity at different depths. We have also taken into account the path losses caused by absorption and scattering, and carried out a comprehensive performance comparison between the horizontal and the vertical UWVLC systems. Insights show that compared to horizontal links, vertical links need an extra relay in order to achieve the same level of matching performance. Moreover, it is shown that the horizontal system’s outage performance improves with depth.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10040429