XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Aiming to introduce new directions to improve the performance of narrow-band power line communication (PLC) systems in low-voltage electric power grids, this study introduces an active-based capacitive PLC coupling circuit for duplex communication. Simulations show that transmission and reflection parameters achieved good results while the Op-Amp provide...

This paper describes the use of step (SI), double- step (DSI) and graded-index (GI) PMMA-based Plastic Optical Fibres (POFs) as the light illuminators for the Digital Fourier Transform Holography. The POFs can generate holograms with contrast and resolution comparable to the case of direct illumination by using red color lasers. DSI-POFs enabled the...

In this work it is described a communication link with white light generated by an array of SMD-LEDs as the transmitter. A single phototransistor is used in the receiver. Effects of diffused light, color-temperature of lighting LEDs and field-of-view are investigated. Optical link tests were performed up to 2m distance in the OOK-NRZ pseudo-random...

Este trabalho apresenta uma discussão sobre o uso de convolução deformável em sistemas de detecção de palavras-chave (keyword spotting - KWS) para operação em ambientes de baixa razão sinal-ruído (signal-to-noise ratio - SNR). A robustez ao ruído ainda é um problema crítico em aplicações de reconhecimento automático de fala do mundo real. Para mitigar...

White LEDs can be simultaneously used for communication and illumination. This paper describes the frequency response of an omnidirectional light collector (OLC) made from fluorescent plastic optical fibres able to filter the slow luminescence from the phosphor coating of the LED. This OLC is useful for omnidirectional detection of modulated optical...

Neste artigo será apresentada uma análise comparativa de desempenho de várias técnicas de sensoriamento espectral cooperativo e centralizado com fusão de dados, a saber: Gini index detector (GID), Pietra-Ricci index detector (PRIDe), generalized likelihood ratio test (GLRT), weighted circular folding cooperative power spectral density split cancellation...

This paper aims to evaluate the performance of 5G over mmWave. Estimation of signal coverage in two bands, i.e., n260 (39 GHz) and n261 (28 GHz) in scenarios of Line-of-side (LOS) and Non-line-of-side (NLOS) is also provided. The results of this study attest to the higher sensitivity of mmWave 5G and show that, to ensure acceptable performance, indoor...

This paper performs a new comparison between distributed and centralized processing implementations of user-centric distributed massive multiple-input multiple-output (D-mMIMO) systems, also known as cell-free mMIMO. The impacts of processing capacity limitations and inter-central processing unit (CPU) coordination are considered to perform a fairer...

The need for ever-higher transmission bands in the most advanced telecommunications systems is primarily brought on by the growing traffic demand from new services and applications aimed at their consumers. These new systems are currently having trouble accessing the necessary bands because of a situation of spectral scarcity. However, the...

This work presents a 5G eMBB (Enhanced Mobile Broadband) device with a circularly polarized radio frequency front-end operating at 3.75GHz. This function enhances the system's reliability and versatility without being affected by its orientation or position. To achieve this goal, the study presents the design of a dual-polarized antenna array that is...