Underwater Optical Wireless Channel Capacity Under Oceanic Turbulence Using Spatial Diversity Techniques

Pedro Salcedo-Serrano, Ruben-Boluda-Ruiz, José María Garrido-Balsells, Antonio García-Zambrana, Steve Hranilovic
January 2023
Cite DOI URL

Abstract

Conventional spatial diversity techniques do not reduce the severe impact of the main impairments in underwater optical wireless communication (UOWC) such as absorption and scattering. This paper addresses a complete comparison of Multiple-Input/Single-Output (MISO) UOWC systems by using spatial repetition coding (SRC) and transmit laser selection (TLS) strategies over salinity-induced oceanic turbulence in clear ocean and coastal waters. We consider an SRC system with sufficient space between sources to efficiently increase the total transmitted power while satisfying eye-safety requirements by assuming a maximum optical power per source in order to obtain the same ergodic capacity performance of a TLS system with the same number of sources. Novel closed-form expressions and asymptotic results are derived to compute such a performance and optimize the UOWC system design. The presented results demonstrate that MISO UOWC systems achieve a greater ergodic capacity as the number of laser sources increases in all kinds of waters. This improvement is greater when SRC scheme is adopted for all the presented UOWC scenarios except when extreme oceanic turbulence conditions are considered. Monte Carlo simulations verify analytical and asymptotic results. © 2023 IEEE.

Type
Conference paper
Publication
IEEE International Conference on Communications
Asymptotic Analysis Channel Capacity Intelligent Systems Monte Carlo Methods Oceanography Optical Communication Turbulence Ergodic Capacity Multiple Inputs Single Outputs Oceanic Turbulence Optical Wireless Communication Systems Repetition Coding Spatial Diversity Spatial Diversity Techniques Spatial Repetition Coding Transmit Laser Selection Underwater FSO Underwater Optical Wireless Communication
Pedro Salcedo-Serrano
Pedro Salcedo-Serrano
Postdoctoral Researcher / External Collaborator

Postdoctoral researcher and external collaborator of WOCLab working on optical wireless communications, underwater optical links, channel modelling and performance analysis.

José María Garrido-Balsells
José María Garrido-Balsells
Professor of Telecommunications Engineering

Professor at the University of Málaga working on wireless optical communications, free-space optical links, underwater optical wireless communications, optical channel modelling and experimental communication systems.

Antonio García-Zambrana
Antonio García-Zambrana
Professor of Telecommunications Engineering

Professor at the University of Málaga working on wireless optical communications, free-space optical links, underwater optical wireless communications, visible light communications, and FPGA/RFSoC-based real-time prototyping.