XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Study about Brain-computer interface (BCI) using the steady state visual evoked potential (SSVEP) paradigm through the characterization of responses of repetitive visual stimuli, analysis of pre-acquired electroencephalogram (EEG) signals, comparison between CAR and short Laplacian spatial filters and the development of classifiers Least Squares (LS) and...

Neste artigo é apresentada uma análise do espalhamento eletromagnético produzido pela interação de uma onda plana e um arranjo de Nanopartículas metálicas do tipo Core-Shell. Para isso utilizou-se um formalismo baseado na representação espectral da Função de Green Periódica, sobre os modos de Floquet, para descrição do Campo Potencial Magnético. Os...

This paper proposes a new metric for performance analysis of the method entitled Spectrum Harvesting with ARQ Retransmission and Probing (SHARP), an underlay cognitive radio network (CRN) technique, i.e. the delay within the primary user transmissions. This variable depends on the operating region, channel utilization and data rate. The influence in...

This paper presents an analytical study of congestion on an elastic single link with two traffic classes that request connections with arrival rates that are jointly taken to infinity. Under these conditions, the study shows the emergence of one or more asymptotically absorbing states, which may be extremely unfair against one class. This singularity is...

A multimission radar (MMR) is employed on a wide range of civilian and military missions. The accuracy of the direction of arrival (DoA) estimation of MMR systems is an important issue when locating targets. In this work, a new approach to DoA estimation based on Graph Signal Processing (GSP) is applied to data from a multimission radar. A comparison of...

Este artigo analisa o impacto da interferência gerada por uma rede LoRaWAN coexistindo no mesmo ambiente que uma rede IEEE 802.15.4g de interesse. As simulações comparam o modo de múltiplos saltos, restrito ao dual-hop nessa análise, com um algoritmo cooperativo, ambos utilizando seleção de relays. Os resultados mostram que a modificação do protocolo de...

Este trabalho investiga métodos eficientes de transmissão para o canal de acesso aleatório gaussiano com um número massivo de usuários. Em um trabalho recente, um método grant-based com resultados promissores comparado a métodos grantless foi proposto. Este artigo é baseado nesse método e foca em aprimorar o estágio de detecção de atividade. O sistema...

In Wi-Fi networks, packet losses can occur due to different causes and are most often characterized by the occurrence of bursts. Markov chains are applied to model these losses, such as the traditional Gilbert-Elliot model that was designed to capture the temporal dependency of losses. Loss models are developed to capture temporal dependency...

Parameter estimation tasks can be found in many applications. In high-energy calorimetry, for example, the amplitude from a conditioned readout signal corresponds to the energy deposited from the particle that generated that signal. However, in high event rate conditions, the received signal may be corrupted from nongaussian noise, degrading the...

The present paper present a theoretical study on the behavior of nanoantennas when excited by a voltage source, in addition to an analysis of the responses in relation to the antenna geometry. Antennas in the distance range where they are investigated are analyzed, a bandwidth, an input impedance, a resonance frequency and irradiation diagram. The...