XLII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

In this work, we explore a hybrid reconfigurable intelligent surface in which the metasurface elements can sense a portion of the incoming signal while reflecting the remainder. We consider a single-user multiple-input multiple-output system whose channel between user terminal (UT) and HRIS experiences short-term changes due to UT mobility. Capitalizing...

Este artigo apresenta o projeto e a análise de uma antena Bowtie com estrutura de Defeitos de Aterramento (DGS) para operação na faixa de frequência de 4 a 5 GHz, com foco na sua aplicação em redes sem fio de próxima geração, como o Wi-Fi 6 (IEEE802.11ax), com dimensões de 30 x 30 mm. O objetivo principal é verificar o desempenho de uma antena Bowtie...

Acoustic echo cancellation (AEC) through adaptive filters requires a large number of coefficients to establish good communication in reverberant environments. In order to increase the convergence rate of the adaptive algorithm, in this paper we explore the exponential decay rate of the room impulse response (RIR) by introducing an additional constraint,...

The Internet of Things (IoT) revolutionizes agriculture, but the quality of the generated data often hinders reliable decision-making. This study introduces the Data Quality Assurance Tool (DQAT), an open-source, event-driven framework tailored for real-time data assessment in IoT systems. DQAT's modular architecture enables seamless integration with...

This article describes the design of a Wi-Fi control and monitoring system for pasteurizing buffalo milk, aimed at small producers in the Amazon region, known for having the highest concentration of buffaloes in Brazil, providing them with an affordable solution. The system will be used specifically to sterilize and stabilize the milk until it is...

Este estudo tem como objetivo avaliar o comportamento de portadoras OFDM em transmissões de dados utilizando PLCs e sua interação com corpos presentes no ambiente. Essa interação pode ser empregada como indicador para detectar pessoas em ambientes internos, de forma passiva sem um papel ativo do alvo. A infraestrutura de estudo foi idealizada e montada...

Monitoring people flow in indoor environments can help in the improvement of marketing strategies, the optimization of services, and is essential for access control and security in public places. This work addresses the implementation of an intelligent people monitoring system in commercial establishments. Using YOLO technology, the system aims to...

A reconstrução de imagens em super-resolução tem sido de interesse em diversas áreas, como imagens médicas, vigilância, jogos eletrônicos, entre outras. Neste trabalho, são avaliadas diferentes funções-custo no contexto de super-resolução de imagens para jogos eletrônicos. Para isso, utiliza-se uma versão simplificada do modelo de [1], que faz uso de...

This work presents a cost-effective solution for extending internet access to underserved communities in the Amazon and other isolated regions. By deploying private LTE networks using open-source software, such as MagmaCore, a core network solution, and leveraging satellite backhaul connectivity, we address the limitations of WiFi based community...

In hyperspectral remote sensing, sensors collect data that contain mixed pixels, which have mixed spectra of more than one pure material (endmembers). Recovering the spectra of these endmembers can be formulated as a blind source separation problem, for which non-negative matrix factorization (NMF) techniques have been used extensively. Non-linear...