Outage probability analysis of a cooperative NOMA UWOC system with multiuser scheduling under weak oceanic turbulence

Wenwen Chen; Ping Wang; Boon S. Ooi; Weina Pang; Binna Zhou

doi:10.1364/JOSAA.504125

Journal of the Optical Society of America A
Vol. 41,
Issue 1,
pp. 127-138
(2024)
•https://doi.org/10.1364/JOSAA.504125

Outage probability analysis of a cooperative NOMA UWOC system with multiuser scheduling under weak oceanic turbulence

Wenwen Chen, Ping Wang, Boon S. Ooi, Weina Pang, and Binna Zhou

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Wenwen Chen, Ping Wang, Boon S. Ooi, Weina Pang, and Binna Zhou, "Outage probability analysis of a cooperative NOMA UWOC system with multiuser scheduling under weak oceanic turbulence," J. Opt. Soc. Am. A 41, 127-138 (2024)

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Abstract

A downlink cooperative non-orthogonal multiple access (NOMA) multiuser underwater wireless optical communication (UWOC) system with a greedy scheduling scheme has been proposed for the Internet of Underwater Things. In particular, the near user plays as a relay to assist the far user, and both decode-and-forward and amplify-and-forward relaying protocols are considered. Relying on the Gauss-Laguerre quadrature formula, the analytical expressions for the outage probability of users are derived considering the degrading effects of the underwater channel, namely, absorption, scattering, and turbulence-induced fading. The outage performance is further analyzed systematically under different water types, targeted data rates, the number of users, the receiver aperture size, and the power allocation coefficient. Numerical results demonstrate that the performance of the far user can be improved by the proposed cooperative NOMA technology. Moreover, the proposed cooperative NOMA system performs better compared with both conventional OMA and non-cooperative NOMA systems. Monte Carlo simulation results are presented to confirm the accuracy of derived expressions, which have a tight agreement with analytical results.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Water Type	Extinction Coefficients $c$	Correction Coefficients $T$
Pure sea	$0.056 m^{- 1}$	0 ( $D = 0.05 m$ )
Clear ocean	$0.15 m^{- 1}$	0.05 ( $D = 0.05 m$ )
Coastal water	$0.305 m^{- 1}$	0.13 ( $D = 0.05 m$ ), 0.16 ( $D = 0.10 m$ )

Parameter	Value
Laser full divergence angle, $θ$	6°
Source wavelength, $λ$	530 nm
Receiver field of view (FOV)	180°
Receiver aperture diameter, $D$	0.05 m, 0.10 m
Thermal expansion coefficient, $α$	$2.56 \times 10^{- 4} 1 / \deg$
Prandtl number for temperature, $P_{T}$	7
Prandtl number for salinity, $P_{S}$	700
Kinematic viscosity, $υ$	$1.0576 \times 10^{- 6} m^{2} s^{- 1}$
Temperature–salt index, $ω$	−2
Dissipation rate of the mean-squared temperature, $χ_{T}$	$1 \times 10^{- 2} K^{2} s^{- 3}$
Dissipation rate of turbulent kinetic energy per unit mass of fluid, $ε$	$1 \times 10^{- 2} m^{2} s^{- 3}$

Water Type	Extinction Coefficients $c$	Correction Coefficients $T$
Pure sea	$0.056 m^{- 1}$	0 ( $D = 0.05 m$ )
Clear ocean	$0.15 m^{- 1}$	0.05 ( $D = 0.05 m$ )
Coastal water	$0.305 m^{- 1}$	0.13 ( $D = 0.05 m$ ), 0.16 ( $D = 0.10 m$ )

Parameter	Value
Laser full divergence angle, $θ$	6°
Source wavelength, $λ$	530 nm
Receiver field of view (FOV)	180°
Receiver aperture diameter, $D$	0.05 m, 0.10 m
Thermal expansion coefficient, $α$	$2.56 \times 10^{- 4} 1 / \deg$
Prandtl number for temperature, $P_{T}$	7
Prandtl number for salinity, $P_{S}$	700
Kinematic viscosity, $υ$	$1.0576 \times 10^{- 6} m^{2} s^{- 1}$
Temperature–salt index, $ω$	−2
Dissipation rate of the mean-squared temperature, $χ_{T}$	$1 \times 10^{- 2} K^{2} s^{- 3}$
Dissipation rate of turbulent kinetic energy per unit mass of fluid, $ε$	$1 \times 10^{- 2} m^{2} s^{- 3}$

Abstract

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Equations (41)

Journal of the Optical Society of America A