Navegando por Assunto "IoT (Internet of Things)"

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Modelo de propagação usando dois raios com modificação de fase para mobilidade aplicado a receptor LoRa sobre rio.
(Universidade Federal do Pará, 2024-09-19) RIBEIRO, Lucian Morais; BARROS, Fabrício José Brito; http://lattes.cnpq.br/9758585938727609
As predicted by experts, there has been exponential growth in the number of IoT devices used by the general population. Among these devices, one of the most notable groups is the Long Range (LoRa) devices. The most relevant feature of LoRa technology is its low energy consumption, while simultaneously providing a wide coverage area. If applied in the Amazon region – a densely forested, humid area with populations far from urban centers and with very little infrastructure – this technology could offer a new range of services to the region’s inhabitants, including services involving communication on the move. Starting from the principle that the most well-known propagation models are not adjusted to the specificities of the Amazon region, nor do they consider the phase variations caused by receiver movement – which makes radio links difficult to predict – we aim to present solutions to this problem through this work, which presents adjustments to the Two-Ray propagation loss model to accommodate LoRa communications over the Amazon rivers when the receiving devices are in motion. The proposed model is compared to the standard Two-Ray Model, which serves as the baseline, and achieves better results. Additionally, the study evaluates the impact of tides on the propagation loss of LoRa signals in river environments.