The combination of multiple-input multiple-output (MIMO) transmission and orthogonal frequency division multiplexing (OFDM) modulation has been shown to be an effective way substantially enhance the capacity bandlimited optical wireless communication (OWC) systems. In this paper, we propose four OFDM-based generalized MIMO (GO-MIMO) techniques for intensity-modulation direct-detection OWC syste...

The Wells turbine rotor consists of several symmetric airfoil blades arranged around a central hub, and the stagger angle is 90 degrees. These characteristics simplify the total construction of OWC type wave energy converters. Although the Wells turbine is simple, the turbine produces a complicated flow field due to the peculiar arrangement of blades, which can rotate in the same direction irre...

System identification (SI) techniques represent an alternative strategy to provide the hydrodynamic model of oscillating water column (OWC) devices, compared more traditional physics-based methods, such as linear potential theory (LPT) and computational fluid dynamics (CFD). With SI, parameters are obtained, by minimizing a model-related cost function, from input-output data. The main advantage...

In this paper the numerical modelling of an Oscillating Water Column (OWC) Wave Energy Converter (WEC) is studied using DualSPHysics, a software that applies Smoothed Particle Hydrodynamics (SPH) method. SPH Lagrangian meshless method used in growing range applications within field Computational Fluid Dynamics (CFD). The power take-off (PTO) system OWC WEC numerically modelled by adding force o...

A cross-flow air turbine, which is a self-rectifying, air-driven was designed and proposed for the power take-off (PTO) system of an oscillating water column (OWC) wave energy converter (WEC). To predict complicated non-linear behavior turbine in OWC, numerical experimental investigations were accomplished. The geometries nozzle rotor optimized under steady-flow conditions, performance analysis...

This research examines the hydrodynamic performance of an oscillating water column device placed over a sloping seabed under influence irregular incident waves. The numerical model is based on Reynolds-veraged Navier–Stokes (RANS) equations with modified k?? turbulence and uses volume-of-fluid (VOF) approach to monitor air–water interface. To explore OWC in actual ocean conditions, Pierson–Mosk...

The Double Decker Turbine (DDT) is a recent design introduced for oscillating water column (OWC) devices. Its major contribution the combination of two typical solutions in just one prototype: self-rectifying performance, to deal with bidirectional flow, and twin-turbine concept, allowing use unidirectional turbines. This achieved by set concentric turbines, called external internal turbines (E...

Light-emitting diodes (LEDs) are widely used for data transmission in emerging optical wireless communications (OWC) systems. This paper analyzes the physical processes that limit bandwidth and cause nonlinearities light output of modern, high-efficiency LEDs. The carrier transport, as well storage, recombination, leakage active region appear to affect performance, but such purely physics-based...

Optical wireless communication (OWC) has garnered significant importance to provide gigabit capacity links owing its unique features. Free-space optics (FSO) communication, which is the term used for OWC in an outdoor scenario, a good candidate establish ground-to-satellite/satellite-to-ground links. Despite of many advantages, FSO uplink limited by adverse effects beam-wander, beam scintillati...