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Authors
Advisor(s)
Abstract(s)
Devido ao aumento da procura de tráfego, a banda de radiofrequência (RF) esta actualmente em baixa oferta. Uma vez que a Visible Light Communication (VLC) emprega o espectro de luz visível para transmitir e codificar dados, e uma potencial tecnologia sem fios alternativa a considerar. Nos últimos anos, este tipo de tecnologia tem mudado e avançado. Esta tese visa caracterizar e testar ligações de comunicação baseadas em VLC para utilização em sistemas de gestão de tráfego. A infraestrutura primaria para regular o acesso as estradas, semáforos, será em breve substituída por outras mais eficazes para melhorar a gestão do tráfego. Os LEDs brancos Tetrachromatic servem como transmissores da ligação VLC e são utilizados tanto para a transmissão de dados como para a iluminação. O recetor e construído em fotodiodos SiC:H/a-Si:H, que tem sensibilidade de espectro seletivo. A modulação On-Off Keying (OOK) e utilizada para transmitir a mensagem num cenário de intersecção de sete células com uma estrutura de 64 bits e LEDs em cada canto criando uma célula de nove pés de impressão. Utilizando uma ferramenta de simulação, foram obtidas as pegadas de cada célula e o mapa de cobertura. Para demonstrar como a estrutura da moldura e construída e enviada, foi testada uma trajetória com o veículo a viajar de Este para Sul.
Due to increased traffic demand, Radio Frequency (RF) band is currently in low supply. Since Visible Light Communication (VLC) employs the visible light spectrum to transmit and encode data, it is a potential alternative wireless technology to consider. In recent years, this kind of technology has changed and advanced. This thesis aims to characterize and test VLC-based communication links for use in traffic management systems. The primary infrastructure for regulating access to roads, traffic lights, will shortly be replaced by more effective ones to enhance traffic management. Tetrachromatic white LEDs serve as the VLC link’s transmitters and are used for both data transmission and lighting. The receiver is built on SiC:H/a-Si:H photodiodes, which have selective spectrum sensitivity. Modulation On-Off Keying (OOK) is used to transmit the message in a sevencell intersection scenario with a 64-bit frame structure and LEDs at each corner creating a nine-footprint cell. Using a simulation tool, the footprints of each cell and the coverage map were obtained. To demonstrate how the frame structure is constructed and sent, a trajectory was tested with the vehicle travelling from East to South.
Due to increased traffic demand, Radio Frequency (RF) band is currently in low supply. Since Visible Light Communication (VLC) employs the visible light spectrum to transmit and encode data, it is a potential alternative wireless technology to consider. In recent years, this kind of technology has changed and advanced. This thesis aims to characterize and test VLC-based communication links for use in traffic management systems. The primary infrastructure for regulating access to roads, traffic lights, will shortly be replaced by more effective ones to enhance traffic management. Tetrachromatic white LEDs serve as the VLC link’s transmitters and are used for both data transmission and lighting. The receiver is built on SiC:H/a-Si:H photodiodes, which have selective spectrum sensitivity. Modulation On-Off Keying (OOK) is used to transmit the message in a sevencell intersection scenario with a 64-bit frame structure and LEDs at each corner creating a nine-footprint cell. Using a simulation tool, the footprints of each cell and the coverage map were obtained. To demonstrate how the frame structure is constructed and sent, a trajectory was tested with the vehicle travelling from East to South.
Description
Dissertação para obtenção do Grau de Mestre em Engenharia de Electrónica e Telecomunicações
Keywords
Comunicação por luz visível Veículos conectados LED Controlo de tráfego Sensor óptico Visible light communication Connected vehicles LED Traffic control Optical sensor
Citation
PESTANA, Carlos - Connected cars: communication between vehicles and infrastructure through visible light. Lisboa: Instituto Superior de Engenharia de Lisboa, 2022. Dissertação de Mestrado.