Abstract
A comprehensive multiparameter model is proposed for underwater wireless optical communication (UWOC) channels to integrate the effects of absorption, scattering, and dynamic turbulence. The simulation accuracy is further improved by the combined use of the subharmonic method and the strict sampling constraint method by comparing the phase structure function with the theoretical value. The average light intensity and scintillation index are analyzed using the channel parameters of absorption, scattering, turbulence, flow velocity, and transmission distance. Under weak or medium turbulence, the bit error rate (BER) performance can be effectively improved by increasing the transmitting light power. The power penalty of a 50 m UWOC channel is 5.8 dBm from pure seawater to ocean water and 1.0 dBm from weak turbulence to medium turbulence, with the BER threshold of 10−6.
Highlights
A comprehensive multiparameter model is proposed for underwater wireless optical communication (UWOC) channels to integrate the effects of absorption, scattering, and dynamic turbulence
Under weak turbulence in pure seawater, the bit error rate (BER) is below 10−6 with a transmitting power higher than 0.7 dBm, but it becomes about 10−2 under medium turbulence in ocean water
The subharmonic method and the strict sampling constraint method have been applied in combination to improve the modeling accuracy to 96.19% in line with the theoretical statistics
Summary
The underwater optical channel is affected by absorption, scattering, and turbulence. The refractive index of water will slightly increase as the pressure increases or the temperature decreases within the normal range [24], and the dissipation rate of mean-squared temperature χ T in the PSD function in Equation (4) is related to the temperature gradient of water [23] In this way, the phase values on the screen can be obtained to model the effect of underwater turbulence. Based on the above channel model, the comprehensive analysis of all the relevant parameters’ effects on the UWOC channel can be carried out, including the absorption and scattering coefficients ( a, b), the turbulence inherent properties (ε, χT , ω ), the macroscopic velocity of water flow (ν), and the total transmission distance (z). Both can be obtained from the PDFs through numerical simulations. σN 2 is the additive white Gaussian noise (AWGN) introduced by the communication system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
