XXXVI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Este artigo propõe uma nova abordagem para o uso de medições obtidas por sensores em redes de computadores, com aplicação em topologias de Internet das Coisas (IoT) e em redes definidas por software (SDN). O desempenho da abordagem proposta é comparado a uma típica topologia de rede OSPF tradicional. O papel do processamento distribuído das...

This work proposes a new technique to be used in orthogonal frequency division multiplexing (OFDM) systems subject to nonlinear power amplification, aiming to obtain better bit error rate (BER) performance with reduced computational complexity and low peak-to-average power ratio (PAPR). The core of the proposed technique is a new metric to choose a...

The GRCR (Gerschgorin radii and centers ratio) detector was recently proposed for application in spectrum sensing for cognitive radio systems. Its main attributes are the low complexity and the robustness against nonuniform and dynamical thermal noise and received signal power. This article evaluates the performance of the GRCR under the influence of...

Frequency response functions have been employed as damage-sensitive features in the vibration-based structural damage detection. The need for measuring the excitation forces arises as a remarkable limitation on the application of those features in real-world applications. Transmissibility measurements can be explored as features with output-only...

This paper presents a comparative study between the transmission and reflection modes of photoplethysmography to measure heart rate signals. In this study, a circuit for heart rate acquisition and measurement was developed, which was integrated to the Arduino to process those signals. Samples of three different individuals were analyzed, and the results...

Viaturas táticas são um recurso usual em sistemas de comando e controle. Para o adequado estabelecimento dos enlaces de comunicações, é importante conhecer o desempenho das antenas instaladas no veículo. Este trabalho analisa uma antena monopolo HF em diferentes comprimentos e inclinações no topo de uma viatura tática. Com relação ao caso do...

In this work, a formulation was developed for parabolic equations in the time domain (TDPE), considering nonhomogeneous atmosphere and disregarding backscattering. The formulation uses as base the frequency domain and through a special Fourier transform defined by Popov there is the conversion to the time domain. The Cranck-Nicolson method is used for...

This article presents a rectangular patch antenna initially designed for the frequency of 5.8 GHz with truncated ground plane and a rectangular slot in the patch in order to verify the influences of these changes in antenna radiation behavior. The purpose is to parametrically analyze the effect of the change in ring widths as well as compare with a...

A restauração de imagens busca eliminar as distorções causadas no processo de aquisição. Neste artigo, utiliza-se uma rede neuronal MLP (Multilayer Perceptron) para restaurar imagens que contêm quatro tons de cinza e que foram degradadas por uma função gaussiana.

Passive optical networks (PON) have been increasingly used by telecom operators as access networks and have well-defined resource control mechanisms for downstream and upstream traffic. However, the integration of other technologies such as Fuzzy logic and software defined networks (SDN) can be used as an alternative to optimize or increase the...