Search results for "Optical wireless"

showing 6 items of 6 documents

Optical wireless communication systems

2017

Abstract The emerging field of optical wireless communication (OWC) systems is seen as potential complementary technology to the radio frequency wireless communications in certain applications. It is deemed as a possible technology in the future 5th Generation communication networks to address the spectrum congestion and improve the system’s capacity. More research and developments in OWC is still needed in order for it to be adopted in current and future communication systems. This special issue brings together research papers on OWC covering free space optic, visible communications and ultraviolet communications.

Wi-Fi arrayComputer scienceEspectre ultraviolatVisible light communication02 engineering and technologyCommunications system01 natural sciences010309 optics0103 physical sciences0202 electrical engineering electronic engineering information engineeringWirelessElectrical and Electronic EngineeringWired communicationFixed wirelessComunicació i tecnologiaComputingMilieux_MISCELLANEOUSWireless networkbusiness.industry020206 networking & telecommunicationsWireless WANBase transceiver stationOptical performance monitoringTelecommunications networkAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsKey distribution in wireless sensor networksOptical wireless[SPI.OPTI]Engineering Sciences [physics]/Optics / PhotonicbusinessTelecommunications[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processingFree-space optical communication
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Route diversity analyses for free-space optical wireless links within turbulent scenarios

2013

Free-Space Optical (FSO) communications link performance is highly affected when propagating through the time-spatially variable turbulent environment. In order to improve signal reception, several mitigation techniques have been proposed and analytically investigated. This paper presents experimental results for the route diversity technique evaluations for a specific case when several diversity links intersects a common turbulent area and concurrently each passing regions with different turbulence flows.

Signal processingLightH600business.industryComputer scienceTurbulenceOptical communicationOptical DevicesModels TheoreticalÒpticaSignalAtomic and Molecular Physics and OpticsPhysics::Fluid DynamicsVariable (computer science)Route diversityOpticsTelecommunicationsElectronic engineeringOptical wirelessScattering RadiationComputer SimulationbusinessWireless TechnologyComunicació i tecnologiaFree-space optical communication
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Fading mitigation coding techniques for space to ground free space optical communications (Euro Med Telco 2014)

2014

In this manuscript, a Geostationary satellite-toground Free Space Optics (FSO) downlink channel model has been implemented, which is able to predict temporal irradiance fluctuations caused by scintillation at a wide range of turbulence conditions and for different values of the zenith angle. In order to mitigate fading events that occur in FSO communications, we have also tested the performance of three different families of Rateless Codes (Luby Transform, Raptor and RaptorQ) into our model and found that RaptorQ is the best candidate to mitigate errors in FSO links.

Space-to- Ground FSO linkSettore ING-INF/03 - Telecomunicazionifading mitigationrateless codeSettore ING-INF/02 - Campi ElettromagneticiOptical Wireless Communicationtime-serieSettore ING-INF/01 - Elettronica
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Fading mitigation coding techniques for space to ground free space optical communications

2014

Settore ING-INF/03 - TelecomunicazioniSpace-to-Ground FSO links time-series rateless codefading mitigationSettore ING-INF/02 - Campi ElettromagneticiOptical Wireless CommunicationSettore ING-INF/01 - Elettronica
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Fading mitigation coding techniques for space to ground free space optical communications

2014

In this manuscript, a Geostationary satellite-toground Free Space Optics (FSO) downlink channel model has been implemented, which is able to predict temporal irradiance fluctuations caused by scintillation at a wide range of turbulence conditions and for different values of the zenith angle. In order to mitigate fading events that occur in FSO communications, we have also tested the performance of three different families of Rateless Codes (Luby Transform, Raptor and RaptorQ) into our model and found that RaptorQ is the best candidate to mitigate errors in FSO links. Keywords— Optical Wireless Communications; Space-toGround FSO links, time-series, rateless codes; fading mitigation

ScintillationFading distributionGeographyOptical communicationGeostationary orbitElectronic engineeringFadingZenithOptical wireless communicationsFree-space optical communication2014 Euro Med Telco Conference (EMTC)
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On the evaluation of an optical OFDM radio over FSO system with IM-DD for high-speed indoor communications

2017

En aquest article es proposa un nou sistema híbrid de ràdio sobre fibra (RoF) i òptica d’espai lliure (FSO) basat en la transmissió de senyals òptics OFDM (OOFDM) per proporcionar enllaços de comunicació sense fils òptics d’alta capacitat. Es proposa un esquema de transmissió de baix cost basat en IM-DD per simplificar i reutilitzar la infraestructura existent per desplegar un enllaç FSO d’alt ample de banda. Aquest article mostra els resultats experimentals basats en la implementació de l'esquema proposat sota una transmissió digital OOFDM de 16 QAM a través de 10 km de fibra monomode (SMF) i enllaç FSO de 300 mm. Els resultats mostren la viabilitat de desplegar un sistema de comunicació d…

quadrature amplitude modulationoptical wireless communications:CIENCIAS TECNOLÓGICAS [UNESCO]OFDM modulationradio-over-fibrefree-space optical communicationUNESCO::CIENCIAS TECNOLÓGICASindoor communication
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