XLIV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

This paper proposes the CONV-TNLMS architecture for harmonic component estimation in electrical power systems, based on the convex combination of scalar NLMS and tensor NLMS adaptive filters operating in parallel. Tensor modeling via Kronecker product decomposition reduces the number of adapted parameters, while the convex combination mechanism with...

Reconfigurable intelligent surfaces (RISs) can improve wireless coverage and spectral efficiency, but practical deployments are limited by channel estimation overhead and by the number of RIS reconfigurations within a transmission frame. Statistical channel state information (S-CSI) is a low-overhead alternative for RIS phase-shift design and user...

Communication in forest and dense foliage environments is challenging because vegetation obstructs the Fresnel zone, increases multipath propagation, and attenuates radiofrequency signals through leaves, trunks, and moisture. This paper evaluates the performance of LoRa Chirp Spread Spectrum (CSS) communication in a dense foliage scenario using Heltec V3...

Este artigo apresenta o projeto e a análise de uma antena de microfita com estrutura PBG (Photonic Band Gap) baseada no padrão quasiperiódico de Penrose. A antena foi projetada em substrato FR4 (εᵣ = 4,4) utiliza furos de ar no substrato para obter melhores resultados nos parâmetros da antena. O uso de um PBG quasiperiódico inspirado em Penrose trouxe...

Accurate estimation of vertical ground reaction force (vGRF) outside laboratory environments remains a key challenge in wearable biomechanics and rehabilitation monitor- ing. This study investigates subject-independent vGRF estimation from a single triaxial tibial accelerometer using a fully repro- ducible experimental pipeline. A leave-one-subject-out...

In this study, the coexistence between a multiple-input and multiple-output (MIMO) primary network (PN) and a distributed MIMO (D-MIMO) secondary network (SN) is analyzed when both networks operate in time division duplex (TDD) and their uplink (UL) and downlink (DL) phases are not synchronized. The impact of the interference is observed when the...

This work proposes a blink detection method based on video magnification and evaluates its performance against the Eye Aspect Ratio (EAR), a widely used geometric landmark based approach. The methods were assessed using 221 manually annotated blink events collected from two subjects performing fixation and reading tasks at three acquisition distances....

Non-Terrestrial Networks (NTNs) are commonly envisioned as a means of extending coverage beyond the reach of terrestrial infrastructure. However, they can also be used to complement Terrestrial Networks (TNs) in supporting traffic demand. This paper evaluates load balancing strategies for TN-NTN coexistence through bidirectional user offloading and...

This paper presents a comparative analysis of power control algorithms for dense wireless uplink networks. Three approaches are evaluated under noise-limited and interference-limited scenarios: Distributed Power Control (DPC), MaxSum, and MaxProd. Results show that DPC provides higher energy efficiency, while MaxProd achieves a balanced trade-off between...

Monitoring systems in oil wells generate large volumes of multivariate time-series data that often need to be used for local decision-making, motivating the use of embedded machine learning solutions for real-time anomaly detection at the edge. Implementing machine learning models on resource-constrained single-board computers requires efficient...