XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

The problem of seismic deconvolution, based on the sparse hypothesis of the reflection profile, requires the optimiza- tion of a non-linear and multimodal function. In this work, we investigate the use of different evolutionary algorithms to perform the search of deconvolution filter parameters that minimize a normalized pseudo-Huber function, which...

Establishing the warm-up period is a recurrent problem in discrete event simulation. The MSER-5 method for transient detection is consolidated and one of most cited work in the literature due to its simplicity and interesting results. This work suggests adaptations in the method to achieve better error rates and execution times. These suggestions...

Neste trabalho, apresenta-se um projeto de modem acústico que transmite dados utilizando modulação multiportadora através do ar livre. A escolha deste tipo de modulação em detrimento da modulação monoportadora se deve a necessidade de um uso mais eficiente da largura de banda limitada, e a minimização dos efeitos de multipercurso e desvanecimento...

The fronthaul of the future 5G networks is expected to be the bottleneck for coping with the increasing data traffic demand. Despite optical fiber is the preferred alternative for fronthaul, technologies like phantom mode has boosted the data rates over copper lines. Previous works have investigated the application of phantom mode and its interaction...

Neste trabalho, são empregadas técnicas de processamento digital de sinais, baseadas no modelo linear de produção da fala, para analisar a qualidade vocal. É avaliado o potencial discriminativo dos parâmetros obtidos da análise de predição linear (Linear Predictive Coding - LPC) - coeficientes LPC, coeficientes cepstrais e mel-cepstrais na...

Technological advances have been successfully achieved in precision agriculture using autonomous agricultural vehicles. Among these advances, the increase of efficiency and productivity in field operations can be highlighted. Several autonomous driving systems are implemented using the GPS RTK system, which allows operations to centrimetric...

A decomposição em funções de modo intrínseco e parte da transformada de Hilbert-Huang e nos permite a identificação de parâmetros inerentes ao sinal. Analisaremos esta decomposição que, juntamente com a transformada de Hilbert, possui grande aplicabilidade na analise de sinais neurais relacionados ao reconhecimento de padrões, tais como o sinal evocado P300.

Isolated Word Recognition (IWR) can be used in different applications, including home automation and car device control. These applications often take place in reverberant environments. Reverberation causes spectral distortion, harming IWR performance. We propose a multi-condition training method that uses both reverberant and non-reverberant...

Known File Filtering method separates relevant from non-relevant information in forensics investigations using white or black lists. Due to limitations on hash functions (inability to detect similar data), approximate matching tools have gained focus recently. However, comparing two sets of approximate matching digests using brute force can be too...

This paper presents a numerical analysis of an array of gold nanoparticles in a Surface Plasmon Resonance sensor (SPR) in Kretschmann configuration. This is a study for a sensor response in function of the distance nanoparticles for two adjusts in its multilayer structure for the influence analysis in the sensibility, where we have checked the...