  In this paper, we simulated a diffusion adaptive network in the underwater
environment. The communication method between the nodes of this network is
assumed to be the visible light communication technology (VLC) which in the
underwater condition is known as the UVLC. The links between the nodes in this
case are contaminated with the optical noise and turbulence. These
contaminations are modeled with the proper statistical distributions depending
on the underwater conditions. The optical turbulence modeling link coefficients
are shown to be following the Log-normal distribution which its mean and
variance are directly dependent on the temperature and the salinity of the
simulated water and the assumed distance between the diffusion network nodes.
The performance of the diffusion network in using UVLC technology is then
analyzed both with simulations and theoretical calculations and the results are
presented using the steady-state error metrics. Our analysis showed that the
diffusion network can be implemented underwater with the VLC technology
providing that the distance between the network nodes is less than 10 meters.
Also, in order to guarantee the convergence of the adaptive network, the water
salinity level and temperature must not exceed the values that are presented in
our simulations.
