XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This work evaluates LoRa technology to remotely control a robotic arm in Marabá City, which has wooded areas with trees up to 12 m high and suburban buildings. The arm is a prototype built with MDF pieces, capable of performing eight movements. The measurement campaign shows that without a line of sight, the arm was remotely controlled at distances of up...

Esse trabalho apresenta o desenvolvimento de uma plataforma IoT (Internet of things) para aluguel compartilhado de bicicletas como uma solução sustentável para mobilidade em ambientes urbanos. A plataforma é composta por uma eletrônica de hardware necessária para ancoragem de bicicletas, um aplicativo móvel para interação do usuário com o serviço, um...

Counter-battery radars have been gaining notoriety due to their ability to counter modern artillery threats, by estimating the launcher position of enemy projectiles with great precision and speed. The present work proposes a real-time method for estimating ballistic projectile drag parameters based on 3D measurements of radars. A method for the...

This paper investigates an energy harvester constituted by an array of N cantilever piezoelectric elements to raise the power harvested from the vibration energy in moving freight cars. Firstly, the parallel array is considered since it is able to increase the output current using the same bridge rectifier. Secondly, it demonstrates that connecting a...

This work focuses on the design of a band-pass filter for the 66 GHz to 71 GHz Inter-Satellite Services band. The design aims to address the need for reliable and efficient inter-satellite communications within small satellite formations, which is considered a promising solution for advancing Beyond-5G communications. The design approach utilizes the...

Os arranjos de antenas esparsos aparecem em diferentes aplicações. Um dos principais problemas destas antenas é que se os elementos são espaçados de forma uniforme, estes apresentam lóbulos laterais de intensidade elevada. Uma das configurações mais promissoras para evitar este efeito é o posicionamento dos elementos conforme a espiral de Fermat. Neste...

In this paper we implement two quantum machine learning (QML) algorithms, namely, kernel-based classifier (QKC) and variational quantum classifier (VQC), considering different types of encoding functions. We compare its performance to that of its classical counterpart, the classical support vector machine (SVM) applied to the multi-user detector in a...

In hyperspectral sparse unmixing, a successful approach employs spectral bundles to address the variability of the endmembers in the spatial domain. However, the penalties used aggregate substantial computational complexity, and the solutions are very noise-sensitive. Thus, we generalize the multiscale spatial regularization approach to solve the...

Este artigo apresenta a aplicação de uma técnica de aumento de ganho em antenas de microfita para uso em redes celulares de quinta geração (5G), operando na faixa de frequência de 3,5 GHz. O método consiste em inserir quatro pinos metálicos de forma simétrica no elemento ressonante de uma antena de microfita quadrada, estabelecendo um curto-circuito com...

The implementation of new mobile communication systems brings challenges in network structuring, aiming for high data rates, low latency, spectral efficiency, and device density. Neural networks can optimize the circuits, but they face the massive amount of real-time data to be processed. In this study, a hardware accelerator was emulated to speed up the...