XL Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This article presents a study of the impact of noise and reverberation on speech intelligibility and quality. This evaluation includes the use of ideal masks IBM, IRM and IQM, and the blind masks BRM and BAM. The objective intelligibiliry measures ESII and STOI and quality measures PEAQ and PESQ are considered in the experiments. The impact of noise and...

This paper studies the effectiveness of Sentiment Analysis, via the BERTimbau language model, for a consumer complaints dataset from the Consumidor.gov platform. Transfer Learning is employed for the finetuning phase and a manually-labelled test set is designed to evaluate the model. Classification results show a F1-Score of 74% for the "Satisfied" class...

Agriculture innovation has become essential to increasing the efficacy of food production. Wireless Sensor Networks and the Internet of Things can play an essential role in this innovation process. This paper proposes and validates a LoRa network that applies Machine Learning capabilities on edge following an Internet of Things approach. The Wireless...

Quadrature Amplitude Modulation based Filter-Bank Multi-Carrier (QAM-FBMC) is a promising multicarrier modulation technique for communication systems. In this paper, we propose a short prototype filter optimization to improve the QAM-FBMC system performance. The presented filter is obtained by optimizing the weighted sum of discrete prolate spheroidal...

The majority of mechanical components went through a machining process during their manufacturing. Therefore, manufacturing processes with inadequate condition tools are likely to induce unexpected operational interruptions, accidents, product quality, and economic losses. Accordingly, the ability to classify fault imminences can result in cost...

In this paper, the authors investigate the use of feedforward neural networks to estimate the location and velocity of non-cooperative targets in passive radar systems. Time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements between the direct-path signals originated by an illuminator of opportunity and the target's...

Persian Lime (Citrus × latifolia) is a citrus fruit commonly called Tahiti lime in Brazil, a major exporter of it. In this work, we propose a computer vision-based system to automatically classify Persian lime according to color, size, and defect. We designed a dataset composed of images from hundreds limes in several conditions to train and validate the...

Este trabalho relata a transmissão RoF seguido por um enlace baseado em comunicação por luz infravermelha com feixe direcionado (BS-ILC), que utiliza a tecnologia de óptica em espaço livre (FSO). O transmissor é baseado em óptica integrada. No sistema RoF/BS-ILC proposto, um sinal M-QAM foi transmitido por um fronthaul óptico de 12,5 km, seguido por um...

A estratégia de formatação de feixes de energia, do inglês, Energy Beamforming (EB), realizado por uma torre transmissora de energia ou, do inglês, Power Beacon (PB), com múltiplas antenas em redes de comunicações energizadas por ondas de rádio, do inglês, Wireless Powered Communication Network (WPCN), possui um grande potencial de aplicação em redes sem...

There are several different IoT middleware platforms available for IoT systems. However, most of these platforms require high computational hardware to be implemented, making their use in low-cost and computationally restricted devices difficult. This motivated us to develop an IoT architecture and template suitable for computationally restrained...