XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

In this work, we propose a Multiple Kronecker product-based Space-Time (MKronST)-based coding for single-hop point-to-point Multiple-Input Multiple-Output (MIMO) systems that employ space-time spreading scheme whose certain number of data streams are spatially spread within the antennas of a subarray while other ones are spread across antennas of...

This work explores a framework of numerical techniques to design a wideband TEM coaxial horn for millimeter waves operation. Firstly, aperture dimensions and flare angle were determined to avoid nulls in vertical radiation pattern at θ<55°. Then, a transition to 2.92mm connector and a dielectric support for the central conductor are proposed. To enhance...

This article presents the current stage of the implementation of the PA5Ge, which is a mobile network based on functionalities of the fourth (4G) and fifth (5G) generations, licensed for scientific and experimental purposes in the 700 MHz band. The PA5Ge has modern features such as virtualization of network functions (VNFs) and architecture of...

In this work, the amplitude-frequency graphs provided by Hilbert's marginal spectrum are used to characterize both healthy voice signals as those with vocal deviations: roughness, breathiness and strain. The results demonstrate that the obtained patterns seem to be appropriate to differentiate the analyzed signals.

In this work we prove that the diagonal space-time block code 2 × 2 with minimum determinant 1 based on an irreducible quadratic polynomial x^2+ζ_3-1 over Q(ζ_3) is optimal in terms of normalized density. We also present diagonal space-time block codes 2 × 2 with minimum determinant 1 based on irreducible quadratic polynomials over Q( √ d), d = −2, −7...

With technological development, wireless communication has been one of the fastest growing fields of Computing and Engineering in recent years. This fact requires that new approaches be developed to ensure better performance and reliability in wireless communication. In this paper a new approach has been proposed as a solution to the problem of adaptive...

This paper presents the study and developing of a traffic signs recognition system, using image processing techniques. The system was trained and tested in a public image database, and then, validated in image captured by a moving car. The system has achieved 70% of traffic signs recognized.

O presente trabalho desenvolve uma metodologia para identificar lesões em imagens de radiografias periapicais utilizando os classificadores KNN e MLP em conjunto da clusterização baseada na \varphi-divergência como método de segmentação. Também é comparado duas técnicas de balanceamentos de dados, Tomek Link e o Random Under Sampling. Com base nos...

Ensaios eletromagnéticos não destrutivos vêm sendo desenvolvidos para acompanhamento de formação de microestruturas deletérias em materiais ferromagnéticos. No presente trabalho, o ruído magnético de Barkhausen resultante da interação entre ondas emissoras de 5 Hz e um aço inoxidável duplex é estudado através da transformada wavelet discreta. Os...

Resumo- Na última década o aumento do consumo de largura de banda pelos usuários impulsionou o surgimento de novas tecnologias para os sistemas de comunicações ópticas. Dentre essas novas tecnologias é possível destacar as Redes Ópticas Elásticas, que tem como principal mudança de paradigma a alteração da grade fixa até então presente nas redes WDM. Este...