Performance Studies of Underwater Wireless Optical Communication Systems
with Spatial Diversity: MIMO Scheme
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by
Mohammad Vahid Jamali, Jawad A. Salehi, Farhad Akhoundi
2016
Abstract
In this paper, we analytically study the performance of multiple-input
multiple-output underwater wireless optical communication (MIMO UWOC) systems
with on-off keying (OOK) modulation. To mitigate turbulence-induced fading,
which is amongst the major degrading effects of underwater channels on the
propagating optical signal, we use spatial diversity over UWOC links.
Furthermore, the effects of absorption and scattering are considered in our
analysis. We analytically obtain the exact and an upper bound bit error rate
(BER) expressions for both optimal and equal gain combining. In order to more
effectively calculate the system BER, we apply Gauss-Hermite quadrature formula
as well as approximation to the sum of lognormal random variables. We also
apply photon-counting method to evaluate the system BER in the presence of shot
noise. Our numerical results indicate an excellent match between the exact and
upper bound BER curves. Also a good match between the analytical results
and numerical simulations confirms the accuracy of our derived expressions.
Moreover, our results show that spatial diversity can considerably improve the
system performance, especially for channels with higher turbulence, e.g., a
3×1 MISO transmission in a 25 m coastal water link with
log-amplitude variance of 0.16 can introduce 8 dB performance improvement
at the BER of 10^-9.
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