Underwater Optical Wireless Communication (UOWC) has gained significant attention, in recent years, due to higher bandwidth, more immune to latency, lower cost and smaller volume transceivers in comparison to RF and acoustic. UOWC is used in numerous applications such as mineral exploration, ocean observation, submarine communication, diver-to-diver communication, military applications, underwater navigation and surveillance.

The power consumption of battery-powered isolated underwater nodes defines their lifespan, and due to the high replacement costs, it is a primary minimization objective. At the physical layer, modulations and encoding with pulsed shapes are better alternatives than continuous waveforms such as OFDM or CSK. However, these types of signals can be pulse width modulated in order to take advantage of high efficiency non-linear drivers. Additionally, power control algorithms (PCAs) help save energy by adapting the emitted power of isolated nodes.

This project will take into account that in underwater environment the best transmission windows are generally located in the blue-green region however the response of the optical devices makes red transmissions more energy-efficient below a critical distance. The use of low-power underwater IoT networks will be tested in a practical setup to measure the water quality parameters in seas, rivers and water treatment stations.

Majlesein, Behnaz; Geldard, Callum T. ; Guerra, Victor; Luna-Rivera, J.M. ; Rufo, Julio; Popoola, Wasiu O. ; Rabadan, Jose (October 2023)
Poster: “Experimental Study of Wavy Surface Effects on Uplink Water-Air Optical Camera Communication”
The 29th Annual International Conference On Mobile Computing And Networking (ACM MobiCom) 2-6 Oct 2023, Madrid, Spain

Majlesein, Behnaz; Geldard, Callum T.; Guerra, Victor; Rufo, Julio; Popoola, Wasiu; Rabadan, Jose (June 2023)
"Empirical study of an underwater optical camera communication system under turbulent conditions"
Optics Express: 31 (13)

Majlesein, Behnaz; Guerra, Victor; Rabadan, Jose; Rufo, Julio, Perez-Jimenez; Rafael (September 2022)
“Evaluation of communication link performance and charging speed in self-powered Internet of underwater things devices”
IEEE Access

Majlesein, Behnaz; Matus, Vicente; Jurado-Verdu, Cristo; Guerra, Victor; Rabadan, Jose; Rufo, Julio (July 2022)
“Experimental Characterization of Sub-Pixel Underwater Optical Camera Communications”
13 th IEEE/IET International Symposium on Communication Systems, Networks & Digital Signal Processeing (CSNDSP) 20-22 July 2022, Porto, Portugal

Mir, Muhammad Sarmad; Majlesein, Behnaz; Genovés, Borja; Rufo, Julio; Giustiniano, Domenico (March 2022)
“RGB LED bulbs for communication, harvesting and sensing”
 The 20th International Conference on Pervasive Computing and Communications (PerCom 2022), Pisa, Italy, 21-25 March 2022

Mir, Muhammad Sarmad; Majlesein, Behnaz; Genovés Guzmán, Borja; Rufo, Julio; Giustiniano, Domenico (June 2021)
“LED-to-LED based VLC systems: developments and open problems”
Workshop on Internet of Lights – Colocated with ACM MobiSys 2021 (IoL21), Virtual Conference, 25 June 2021