Performance analysis of underwater vertical wireless optical communication links using selection combining

Savidhan Shetty C S; R. Prasad Naik; U. Shripathi Acharya

doi:10.1364/AO.503360

Applied Optics
Vol. 62,
Issue 31,
pp. 8229-8234
(2023)
•https://doi.org/10.1364/AO.503360

Performance analysis of underwater vertical wireless optical communication links using selection combining

Savidhan Shetty C S, R. Prasad Naik, and U. Shripathi Acharya

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Savidhan Shetty C S, R. Prasad Naik, and U. Shripathi Acharya, "Performance analysis of underwater vertical wireless optical communication links using selection combining," Appl. Opt. 62, 8229-8234 (2023)

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Abstract

In this paper, we have investigated the performance of underwater vertical wireless optical communication (UVWOC) links employing on–off key modulation for selection combining based receive diversity schemes in the presence of underwater turbulence, pointing errors, and attenuation losses. Due to variations in temperature and salinity along the ocean’s depth, turbulence-induced fading affects the performance of the underwater vertical wireless optical link. The vertical link of the underwater medium influenced by a strong turbulence regime is modeled using cascaded gamma–gamma distribution considering multiple non-identical layers along with attenuation losses and pointing errors. We have derived closed-form expressions for the average bit error rate (BER) and outage probability (OP) for the link employing multiple detectors at the receiving end. The accuracy of all of the closed-form expressions derived in this paper has been validated using Monte Carlo simulations.

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	Average BER
Number of Detectors (N)	Weak PE	Strong PE
$N = 1$	$1.22 \times 10^{- 2}$	$1.28 \times 10^{- 1}$
$N = 2$	$1.33 \times 10^{- 3}$	$4.98 \times 10^{- 2}$
$N = 3$	$2.41 \times 10^{- 4}$	$2.33 \times 10^{- 2}$

	Outage Probability
SC Number of Detectors (N)	Weak PE	Strong PE
$N = 1$	$2.58 \times 10^{- 2}$	$2.88 \times 10^{- 1}$
$N = 2$	$1.71 \times 10^{- 3}$	$1.13 \times 10^{- 1}$
$N = 3$	$1.54 \times 10^{- 4}$	$4.99 \times 10^{- 2}$

	Transmitted Power $P_{t}$ (W)
Number of Detectors (N)	$γ_{th} = 5 dB$	$γ_{th} = 25 dB$
$N = 1$	48	68
$N = 2$	28	48
$N = 3$	20	40

	Average BER
Number of Detectors (N)	Weak PE	Strong PE
$N = 1$	$1.22 \times 10^{- 2}$	$1.28 \times 10^{- 1}$
$N = 2$	$1.33 \times 10^{- 3}$	$4.98 \times 10^{- 2}$
$N = 3$	$2.41 \times 10^{- 4}$	$2.33 \times 10^{- 2}$

	Outage Probability
SC Number of Detectors (N)	Weak PE	Strong PE
$N = 1$	$2.58 \times 10^{- 2}$	$2.88 \times 10^{- 1}$
$N = 2$	$1.71 \times 10^{- 3}$	$1.13 \times 10^{- 1}$
$N = 3$	$1.54 \times 10^{- 4}$	$4.99 \times 10^{- 2}$

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Applied Optics