XLIV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This paper investigates the use of Spiking Forward Propagation Through Time (SFPTT) for sign-language recognition on the SL-Animals dataset. Sign-language recognition requires accurate modeling of spatial and temporal patterns, making it well suited for Spiking Neural Networks (SNNs), which naturally process sequential information through spike-based...

Screen-to-camera (S2C) communication is a promising solution for low-cost optical wireless links using commercial displays and cameras. However, hardware non-idealities, such as color crosstalk and gamma nonlinearity, are present in practical screen-camera systems and remain poorly investigated in terms of link performance. This paper incorporates these...

This work presents an algorithm for the experimental characterization of the electro-optic response of semiconductor optical amplifiers (SOAs). An automation algorithm implemented in Python is proposed, using SCPI (Standard Commands for Programmable Instruments) commands for electrical signal generation and data acquisition. A method for minimizing...

This project focuses on the development of a self-checkout system for produce. The system integrates a camera and a digital scale to automate the process of identifying and pricing fruits and vegetables. The camera captures images of the produce to determine its type using image recognition techniques, while the scale measures its weight. By combining...

The densification of mobile networks and the Open RAN architecture impose challenges on mobility management, especially due to the increase in ping-pong handovers and unnecessary handovers that degrade the user experience. This paper proposes a hybrid handover algorithm that combines conventional methods and artificial intelligence to mitigate these...

Este trabalho apresenta um arranjo refletor pixelado para redes não terrestres (NTN), otimizado via algoritmo genético (AG) integrado ao software HFSS. Além da otimização topológica das células, o projeto emprega uma otimização geométrica com inclinação de 15,1° nos quatro vértices do arranjo para assegurar a coerência de fase e a soma construtiva das...

Distributed massive MIMO (D-mMIMO) systems, also known as cell-free networks, provide high and uniform spectral efficiency wireless networks. However, the high density of transmission-reception points (TRPs) in those networks is impractical in certain dynamic and emergency scenarios. This work investigates unmanned aerial vehicles (UAV) acting as TRPs in...

Sistemas de comunicação 6G e além (Beyond 6G - B6G) demandam arquiteturas flexíveis, capazes de operar em múltiplas bandas e em frequências elevadas, incluindo faixas sub-THz. Nesse contexto, as superfícies inteligentes reconfiguráveis (reconfigurable intelligent surfaces - RISs) destacam-se por possibilitarem o controle programável da propagação...

This paper presents the design and experimental validation of a low-cost UAV-based narrowband channel sounding system using a Software-Defined Radio (SDR). The platform integrates RF signal acquisition with Global Navigation Satellite System (GNSS) positioning and Inertial Measurement Unit (IMU) data, enabling synchronized Received Signal Strength...

The 5G New Radio (NR) ecosystem is engineered to support the rigorous Quality of Service (QoS) demands of Extended Reality (XR), necessitating high-bandwidth transmission and ultra-low latency. This paper evaluates the feasibility of an Over-The-Top (OTT) 360-degree video streaming system deployed over a real end-to-end (E2E) 5G infrastructure. The...