XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Neste artigo apresentamos as construções de três classes de códigos coloridos em superfícies compactas com gênero g ≥ 2. Tais classes derivam das tesselações hiperbólicas, {8, 3}, {10, 3} e {12, 3} e possuem taxas de codificação assintoticamente iguais a 1/4, 2/5 e 1/2, respectivamente. Além disso, a distância mínima dos códigos cresce com o gênero da...

With the recent advances of the telecommunications industry, it is becoming increasingly necessary to develop materials that have high values of dielectric constant, low dielectric loss and good thermal stability. This paper presents the development and characterization of ceramics CaBi4T i4O15 (CBT), material known for its excellent dielectric...

This work presents a comparative analysis of correlation and correntropy in the context of graph-based braincomputer interfaces using motor imagery. These two statistical entities are used in the construction of the graphs, from which features are extracted. The results indicate that correntropy has a more consistent performance over the different...

Neste artigo é proposto um método de detecção de falhas ou danos estruturais usando Estatística de Ordem Superior (EOS). A partir de sinais de vibração medidos por um acelerômetro, características são extraídas por cumulantes e selecionadas com o Discriminante de Fischer. Posteriormente é realizada a classificação com o auxílio de Máquinas de...

Narrowband Internet of Things (NB-IoT) is a cellular technology that will provide connection for a massive number of low-cost and low-power devices. This paper describes the analysis of delay bounds for the NB-IoT, calculating minimum delay and maximum delay in the random access procedure, aiming at the best solution in the configuration of...

Sistemas de scanning tridimensional (3D) são utilizados em um grande número de aplicações, tais como na digitalização de quadros, esculturas e patrimônios culturais, engenharia reversa e computação gráfica. A maioria dos scanners 3D disponíveis no mercado são projetados para uma alta resolução e precisão. Isso requer o uso de equipamentos...

The cicada is one of the key crop pests and the only way to combat application of insecticides. However, the sounds emitted by the male, in order to attract females, are peculiar and can be employed for digital detection and classification of species. This work presents an algorithm of signal processing and recognition of patterns to detect and...

This work aims to investigate different techniques for the classification of atypical sound events, considering the accuracy and classification time, in order to find which of these techniques are most advantageous for surveillance scenarios, minimizing the possibility of relevant events to go unnoticed. LDA, QDA, Decision Tree and KNN techniques...

This paper presents the results of a study in sepa- ration of convolutive mixtures by means of linear and nonlinear decorrelation. These techniques have also been applied to the problem of channel deconvolution, exploring the duality between these two fields.

In this work we study group codes over non-Abelian groups which are extensions. Extension of groups is a general- ization of semi-direct product and direct product of groups. For channels having as its input alphabet a signal set, one-to-one matched to a non-Abelian group which is an extension, is given a definition of encoding capacity adapted from...