Vieira, ManuelaVieira, Manuel AugustoLouro, PaulaFantoni, AlessandroVieira, Pedro2020-11-042020-11-042018VIEIRA, Manuela; [et al] – Light-Fidelity (Li-Fi) optical sensing and detection in large indoor environements. In SENSORDEVICES 2018 – The Ninth International Conference on Sensor Device Technologies and Applications. Venice, Italy: IARIA, 2018. ISBN 978-1-61208-660-6. Pp. 54-59978-1-61208-660-62308-3514http://hdl.handle.net/10400.21/12335Este trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2017 do Instituto Politécnico de Lisboa. Código de referência IPL/2017/PPGDiode/ISELEste trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2017 do Instituto Politécnico de Lisboa. Código de referência IPL/2017/SMART_VeDa/ISELEste trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2017 do Instituto Politécnico de Lisboa. Código de referência IPL/2017/EmGraph/ISELIn this work, a Light Emitting Diode (LED) assisted navigation system for large environments is presented. The LEDs are used both for room illumination purposes and as transmitters if modulated at high frequencies. The payload data together with the identifiers, IDs, assigned to the physical location of the transmitters are broadcast using an On-Off Keying (OOK) modulated scheme. The mobile receiver is a double p-i-n/pin SiC photodetector with light controlled filtering properties. Coded multiplexing techniques for supporting communications and navigation together on the same channel are analysed. A demonstration of fine-grained indoor localization is simulated. Different indoor layouts for the LEDs are considered. Square and hexagon mesh are tested, and a 2D localization design, demonstrated by a prototype implementation, is presented. The results showed that the LED-aided Visible Light Communication (VLC) navigation system makes possible not only to determine the position of a mobile target inside the unit cell but also in the network and concomitantly to infer the travel direction in time.engVisible Light CommunicationIndoor positioningSquare and hexagonal topologiesSiC technologyOptical sensorTransmitterReceiverMultiplex/demultiplex techniquesconference object