XLI Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

The main objective of radio technology has always been to achieve higher data rates. Data services are now part of the key applications that users expect, with high speed and low latency. Thus, one of the elements that can influence this quality of service is the type of modulation used. In light of this, this article describes the results of laboratory...

Redes de Sensores Corporais Sem-Fio (do inglês, Wireless Body Area Networks - WBANs) com suporte à mobilidade estão sujeitas a desconexões devido a variações posturais, típicas do movimento humano. Neste cenário, este trabalho analisa o comportamento do protocolo de vetor distância AODV para roteamento em WBANs com mobilidade. Nós avaliamos dois padrões...

Neste artigo, propõe-se uma metodologia para detecção de placas veiculares em ambientes aéreos, onde o objeto de interesse apresenta baixa resolução em pixel em relação à imagem de entrada. A metodologia proposta é composta por três sistemas distintos. Duas utilizam técnicas de melhoria de qualidade da imagem e uma não as utiliza. Ao analisar os...

This article shows the results obtained using computational simulation with the computer software Comsol MultiPhysics to visualize the propagation of the electrical and magnetic fields for the cases of vertical and horizontal polarization. The study modeled a medium more similar to the Amazon region.

This work reports the implementation of a bidirectional radio-over-fiber (RoF) system based on the optical transmission of power and data using the power-over-fiber (PoF) technique. In the proposed system, an RoF module is optically powered for bidirectional signal transmission/reception. The PoF system performance was evaluated in terms of power...

This work investigates the performance of the reconfigurable intelligent surface (RIS) for wideband communication systems, also considering line of sight (LOS) channels. We evaluate the achievable rate of methods such as the alternating optimization (AO) and strongest tap maximization (STM), which are used to configure the RIS. Additionally, the impact...

This work proposes a generalized learning architecture for vehicular channel estimation using the Ensemble Learning (EL) technique applied to a method based on the long-term memory network (LSTM). The challenge of estimating wireless vehicular channels is addressed, where few methods explore generalizing models for variations in wireless channel models....

This paper discusses improvements in the information security of in-home and broadband power line communication systems. To achieve this, we introduce artificial noise, designed based on the degrees of freedom of the cyclic prefix, for impairing the eavesdropper's decoding capacity without adversely affecting the legitimate receiver. Numerical outcomes...

O filtro multicanal de Wiener com preservação da função de transferência interaural (MWF-ITF) é o método estado da arte para redução de ruído com preservação das pistas biauriculares de fontes sonoras pontuais. Entretanto, a determinação dos seus coeficientes envolve a solução de um problema de otimização não-convexo, levando a um custo computacional...

This work addresses the network slicing of radio resources between enhanced mobile broadband (eMBB) and massive machine-type communication (mMTC) services, considering both heterogeneous orthogonal multiple access (H-OMA) and heterogeneous non-orthogonal multiple access (H-NOMA). For increasing the number of supported active mMTC devices, we adapt the...