XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

Due to its ability to provide resources adapted according to demand, Elastic Optical Networks have emerged as a very promising network option. Such networks have been the subject of several studies in order to present techniques and heuristics with the ability to explore their benefits and also find solutions to their problems, among them the routing and...

One of the most important parts of encoding and decoding in polar codes is finding the bit-channel reliability sequence, i.e., the positions of frozen bits and data bits, which has a great effect on the error correction performance. In this paper, we present an algorithm with linear complexity for determining an approximate reliability sequence in small...

Intelligent reflecting surface (IRS) has emerged as a promising technology to enhance wireless communications by smartly shaping the radio propagation environment with reduced hardware and energy costs. In this paper, we integrate the IRS to a multiple-input single-output (MISO) fifth generation (5G) system via the joint optimization of the IRS...

This paper evaluates the secrecy outage probability of a hybrid radio frequency (RF) and visible light communication (VLC) network in the presence of an eavesdropper. We assume that data is transmitted over the RF and VLC links following a proposed multiplexing scheme in which the data sent by the source is split with a certain allocation ratio....

Basically, when considering dynamic traffic and topologies with a high number of nodes, the Dijkstra algorithm is used and its cost function is modified in order to optimize the performance of optical networks. In this context, the contribution of this paper is to adapt a routing algorithm available in the wavelength division multiplexing optical...

In this paper, we propose a channel estimation and joint beamforming design method for multi-IRS multiple-input and multiple-output (MIMO) systems. We investigate the scenario where multiple intelligent reflecting surfaces (IRSs) are located on the exact spot of the channel scatterers. We investigate the spectral efficiency (SE), benefits and drawbacks...

A radiologia depende da extração de informações em imagens, sendo uma área de aplicação natural para aprendizado profundo, cujos modelos se destacam sobretudo em tarefas de Visão Computacional. Destarte, investiga-se a utilização de redes convolucionais para auxiliar radiologistas no diagnóstico dos distúrbios pulmonares: atelectasia, derrame pleural,...

Among the multipath protection schemes found in the literature, the Partitioning Dedicated Path Protection - PDPP proposes to divide the total transmission rate required by the connection in equal parts and then, proceed the transmission of each part using multiple disjoint paths. Nevertheless, it is also possible to partition the transmission rate...

This work presents a fast image centroiding algorithm for CMOS-based digital sun sensors. The image is interpreted as a pixel matrix. The rows and columns pixels intensities are summed and stored in vectors. The centroid coordinates (xc, yc) are obtained by checking the row and column vector index-related higher pixel intensity. This approach was...

Neste trabalho, consideramos o cenário massive Machine-Type Communication (mMTC) baseado no acesso múltiplo Grant-free no qual uma pequena parcela de um número maciço de usuários transmite pequenas quantidades de dados esporadicamente, sem requisitar permissão. O problema de detecção (esparsa) de atividade de usuários (DAU) pode ser resolvido com...