Resumo-Este artigo apresenta estudos sobre a implantação de uma rede de sensores sem fio, com a utilização da tecnologia Lora ® na cidade de Fortaleza. Dessa forma são feitos estudos de análise de cobertura, como modelos de propagação em cenários urbanos e suburbanos. Com base no padrão LoRaWAN™é realizado um planejamento para rede LoRa ® desenvolvendo orçamentos de enlace levando em consideração as especificações dos equipamentos e as perdas de percurso. E para finalizar o estudo na predição de cobertura são realizadas simulações com o software Radio Mobile para implantação dos equipamentos em locais estratégicos no mapa de Fortaleza. Palavras-Chave-LoRaWAN, redes de sensores sem fio, orçamento de enlace.
In this work, we propose a multiple Kronecker product-based space-time (MKronST)-based coding for singlehop point-to-point multiple-input multiple-output (MIMO) systems that employ space-time spreading scheme whose certain number of data streams are spatially spread within the antennas of a subarray while other ones are spread across antennas of different subarrays. Capitalizing on a tensor formalism, the received signals are modelled as a constrained quadrilinear parallel factor (PARAFAC) model, which allows us to derive a semi-supervised iterative receiver for joint symbol and channel estimation. Simulation results are provided to evaluate the performance of the proposed receiver. Our numerical results show that the proposed semi-supervised receiver is capable of jointly estimating the symbol and channel matrices with a superior performance in comparison to competing receivers outlined in the literature.
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