Analyzing Visible Light Communication Through Air–Water Interface
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2019-08-30
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Citation of Original Publication
M. S. Islam and M. F. Younis, "Analyzing Visible Light Communication Through Air–Water Interface," in IEEE Access, vol. 7, pp. 123830-123845, 2019. doi: 10.1109/ACCESS.2019.2938522 keywords: {Optical surface waves;Light sources;Water resources;Atmospheric modeling;Surface acoustic waves;Air-water interface;free space optics;optical communication;underwater wireless networks;visible light communication}, URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8821277&isnumber=8600701
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Attribution 4.0 International (CC BY 4.0)
Attribution 4.0 International (CC BY 4.0)
Abstract
In underwater wireless networks (UWNs), conventionally there is no direct communication
between an underwater node and a remote command center. A floating base-station is often used to serve
as an interface to a UWN; such a base-station would typically have both acoustic and radio modems to
communicate with underwater nodes and off-shore centers, respectively. Although employing an airborne
base-station would avoid the logistically-complicated surface nodes deployment, communication across the
air-water interface becomes the main challenge since it involves two mediums. This paper promotes a novel
way to interconnect UWNs to airborne base-stations through visible light communication (VLC) links. The
paper analyzes the viability of VLC across the air-water interface by determining the coverage area and
intensity inside the water for a light transmitter placed in the air. We show that enough intensity can be
achieved for VLC communication even in the presence of a wavy water surface. We then provide guidelines
for using single and multiple light sources to establish robust VLC links under rough environmental
conditions like high water current and turbidity. Our approach is validated using simulation and a lab
experiment is done to validate the simulation result for flat water surfaces.