XLIV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Este trabalho apresenta o projeto e a análise de uma antena microfita tri-banda desenvolvida por meio de uma abordagem incremental orientada por hipóteses físicas. Inicialmente, um patch retangular operando em 2,4 GHz foi projetado e, em seguida, modificações sucessivas foram introduzidas, incluindo plano de terra truncado, estrutura DGS e inserção de...

Neste artigo, propõem-se dois esquemas de provisionamento de conexões (serial e paralelo) baseados na estratégia de roteamento por multicaminho em uma rede óptica elástica multibanda. Para isso, considera-se uma topologia conhecida na literatura, o ruído de emissão espontânea amplificada, gerado ao longo dos amplificadores ópticos, como penalidade física...

Neste artigo, propõe-se a aplicação de um algoritmo evolucionário adaptativo para se determinar as rotas no contexto de uma rede óptica elástica multibanda híbrida. Para isso, considera-se como penalidade física o ruído de emissão espontânea amplificada, gerado ao longo dos amplificadores ópticos dispostos nos nós e enlaces da rede, três bandas de...

This paper provides a simulation-based comparison between LoRa-inspired Chirp Spread Spectrum (CSS) and Frequency Shift Keying (FSK) modulations. It considers CSS modulation with different Spreading Factors (SF) and FSK modulation including frequency diversity. As for the channel, additive white gaussian noise, shallow water and snapping shrimp like...

This paper investigates topology optimization and deployment cost modeling in a user-centric distributed Massive MIMO architecture, also known as cell-free networks, where transmission and reception points (TRPs) are interconnected and linked to a central processing unit (CPU) through serial fronthaul links. A dimensioning framework is proposed,...

This paper presents a wideband and high-gain microstrip patch antenna operating at 3.5 GHz for sub-6 GHz 5G applications. The proposed structure employs shorting vias to enable the controlled coupling of TM03-like and TM11-like modes, producing a dual-resonance response for bandwidth enhancement. Simulated results show a 14.6% bandwidth (3.29-3.81 GHz)...

This paper investigates a wireless energy transfer (WET) system assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS), in which the BD-RIS topology, its scattering matrix, and the transmit beamforming are jointly optimized. To address the resulting non-convex problem, an unsupervised learning approach based on two neural networks...

This paper presents a bandwidth- and gain-enhanced microstrip patch antenna operating at 3.5 GHz for 5G applications. The proposed design integrates a λg/4 resonator-based feeding structure with TM30-like mode operation, enabling a dual-resonance mechanism that improves impedance bandwidth without increasing structural complexity. This approach provides...

This paper proposes a Deep Deterministic Policy Gradient (DDPG)-based method for optimizing the horizontal placement of power beacons (PBs) in RF-WET IoT networks. The model considers Rician fading, distance-dependent path loss, nonlinear energy harvesting, and environmental effects from temperature and wind speed. The goal is to maximize the number of...

Assessing telecommunications mobile services quality across municipalities with heterogeneous structural, geographic, and socioeconomic conditions requires methodologies beyond simple scalar or functional aggregations. This paper introduces a self-supervised Graph Neural Network (GNN) based ranking framework that learns the geometry of municipality-level...