XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Stroke is one of the diseases that causes more deaths and physical disabilities in worldwide. The most common method for identifying regions affected by stroke is the computed tomography(CT) scan. The present study aims identify ischemic stroke, using the Haralick descriptorand an artificial neuralnetwork in the CT images. The best results obtained...

In this work, a Neuro-Fuzzy system was used to predict the radiopropagation of a LoRa (Long-Range) signal. The objective is to create a propagation model and analyze its performance, comparing it with models commonly used in the literature, such as the free space model, the ITU-R P.1546 model for distances smaller than 1km and the ITU-R P model: 833 for...

It is challenging to generate wireless channels for 5G/6G scenarios with sophisticated mobility patterns. Ray-tracing (RT) is one of the most adopted techniques, especially when 5G/6G millimeter frequency bands are considered. However, most ray tracers, such as Wireless InSite and Sionna's, provide limited support to mobility: only the radio...

Diante das limitações das imagens de satélites óticos, o radar de abertura sintética (SAR) se destaca pela resistência a condições climáticas adversas. Contudo, o reconhecimento preciso de áreas desmatadas nas imagens SAR é desafiador devido ao ruído ``speckle'' e a variabilidade dos objetos. Neste artigo, realizamos um experimento \textit{online} com...

This paper presents a comparative study on the application of LoRa and Zigbee technologies for telemetry in Formula-SAE cars. It aims to evaluate the feasibility and effectiveness of both wireless communication in the telemetry transmission data from a F-SAE car to a monitoring system platform. The study evaluates the advantages and limitations of both...

Este trabalho tem como objetivo a detecção da doença de Alzheimer (DA) através de parâmetros não-lineares de sinais de fala. Os parâmetros são extraídos de sub-bandas dos sinais, as quais são obtidas por meio da transformada Wavelet, e algumas das suas estatísticas descritivas são utilizadas como entrada para vários classificadores. Acurácias de 100,...

The energy consumption of devices that form Wireless Sensor Networks is a determining factor in the development of routing algorithms. The objective of this research is to perform a systematic review of algorithms based on clusters, elaborated from Web of Science, IEEE Xplore and Science Direct databases. Sixty articles were approved and ten were...

In this paper, we analyze three different methods to perform channel estimation aligned with the joint active and passive beamforming design in an intelligent reflecting surface (IRS)-assisted multiple input multiple output (MIMO) networks. For this purpose, we explore the Kronecker structure of the involved channels to factorize each channel in...

In this study, the simulated response of sensors in water samples with concentrations of 0 mg/L, 8 mg/L, and 10 mg/L of pure metallic copper powder was observed. Based on the differences in resonance frequencies from the reflection coefficient curves, the sensitivity analysis of the sensors was performed. Three types of sensors were designed with PLA...

Neste artigo, duas topologias de elementos espalhadores são analisadas para aplicação em rede refletora (RA) embarcada em nanossatélite padrão 8U. As geometrias avaliadas para as metalizações impressas são: patch quadrado e dipolos. A rede possui dimensão 200 mm × 200 mm, o que permite a conformação da estrutura sobre a face do nanossatélite durante o...