XL Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This paper presents an extension of the real tangent spaces on the form of the Wirtinger (complex) calculus in order to find a generalized expression for the natural complex gradient. It is presented an expression for the natural gradient, which is valid to a general coordinate system, expressed in a complex basis, allowing the use of of the fully...

This paper analyzes the normalized signal-to-noise ratios (nSNRs) of power line and wireless media to evaluate the suitability of hybrid power line/wireless systems in in-home broadband scenarios. In this sense, we assume that the transmitter node knows the channel state information, and then we seek to find the level of diversity between power line and...

Este trabalho apresenta o estudo e implementação de uma prova de conceito referente a uma topologia de rede de Internet das Coisas (Internet of Things - IoT) para áreas remotas baseada nas tecnologias CubeSat e Power-Over-Fiber (PoF). Propõe-se um cenário dividido em três partes: centro urbano, comunicação via satélite (CubeSat) e área remota. O...

We show that magneto-optical (MO) effects in magnetoplasmonic dipole nanoantennas, built by plasmonic ferromagnetic materials, enable active beam steering of the radiated fields. Our design, working at the visible wavelength λ=690nm, is promising for applications in intra- and inter-chip reconfigurable optical nanolinks for future 6G communication networks.

This paper presents the design of a beamformer circuit for dual circularly polarized antennas composed of four sequentially rotated radiators. The beamformer operates over the L band, and its architecture has two 180-deg hybrid couplers, one 90-deg hybrid coupler, and two low-noise amplifiers. Commercial components are selected to build the circuit...

Reactive routing protocols of MANETs create routing tables whose paths can be represented by a routing network, i.e. the network of links created from routing tables that can change over time. These links are created and destroyed according to the mobile behavior of nodes. Different topologies of the routing network impact the performance of a MANET...

Esse trabalho apresenta o desenvolvimento de um pequeno satélite do tipo CubeSat padrão 1U para missão de sensoriamento e mapeamento dos níveis de potência de radiação gama em órbita baixa. Objetiva-se a captura dos dados em diferentes posições dentro da órbita do satélite para a construção de um mapa de calor. Relata-se a fase de prototipação,...

This paper proposes to determine the number of different Quality of Service (QoS) by analyzing the characteristics of the set of LoRaWAN configurations by combining the gap statistic with Fuzzy C-Means (FCM) and elbow with K-means algorithm methods. Additionally, grouping was performed with FCM based on the Bit Error Rate (BER), Received Signal Strength...

Com o propósito de pré-diagnóstico de patologias laríngeas com um método não invasivo, este trabalho apresenta a análise de medidas acústicas vocais como parâmetro de entrada para um sistema de classificação baseado em SVM, sendo eles frequência fundamental, formantes, energia e entropia, Este classificador foi capaz de classificar vozes saudáveis de...

An optical comb frequency generator with a large number of equalized lines by the efficient modulation of a cascade of electro-optic modulators is proposed. Modeling of the array allowed theoretical analysis of the performance and determination of the driving conditions for empirical testing of the modulators. In an array with one phase modulator...