XL Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

A chuva é capaz de atenuar significativamente os sinais em links de satélite com frequências acima de 10 GHz. Nesse contexto, o setor de Radiocomunicações da \textit{International Telecommunication Union} (ITU-R) desenvolveu um modelo para prever atenuações causadas por precipitação. No entanto, este método contém inúmeras operações complexas, incluindo...

This paper aims to analyze how the characteristics of passive components impact the design of power line communication (PLC) coupling circuit for broadband applications. Based on a measurement results, we show that plated through-hole and surface mount device components present distinct behaviors in the higher frequencies. Consequently, we point out that...

This paper advances the investigation of physical layer security of broadband and indoor power line communication (PLC) system when a malicious wireless communication (WLC) device tries to eavesdrop upon private messages exchanged between two PLC devices. To do so, numerical results related to the effective secrecy throughput and the corresponding...

Com o uso de ondas milimétricas (mmWave) na quinta geração (5G) da rede de comunicação do 3GPP, o planejamento de redes celulares passou a apresentar desafios adicionais devido à propagação severa. Este trabalho apresenta uma análise de cobertura para um cenário indoor definido pelo 3GPP que utiliza a faixa de 24,3 GHz. Por meio de prototipagem via...

One of the most popular adaptive algorithms available is the stochastic gradient algorithm, particularly a very simple implementation known as the least-mean-square (LMS) algorithm. Initially, this work offers a concise review of the adaptive filter (AF) theory, including sparse techniques. We then focused on identifying sparse channels, as is often the...

Diante do problema da falta de dinâmica na alocação de usuários no espectro de frequência, o reconhecimento automático de modulações foi uma das soluções para fornecer informações a priori e auxiliar no processo de sensoriamento de espectro. Entretanto, com o aprimoramento de redes generativas adversárias sérias questões de segurança entraram no debate...

Partial transmit sequence (PTS) using metaheuristic optimization methods can achieve a very good compromise between peak-to-average power ratio (PAPR) mitigation of orthogonal frequency division multiplexing (OFDM) signals and complexity. However, one neglected problem is that the side information (SI) needed for demodulation leads to PAPR regrowth. To...

When applying chaotic signals in communications systems it is essential to control and eventually limit the spectral band occupied by these signals. One possibility to achieve this goal is to use discrete-time filters in the feedback loop of dynamical systems. However, the introduction of these filters can destroy the properties of the chaotic dynamics...

Multi-Cell (MC) systems are present in mobile network operations from the first generation to the fifth generation of wireless networks, and considers the signals of all users to a base station (BS) centered in a cell. Cell-Free (CF) systems works with a large number of distributed antennas serving users at the same time. In this context, Multiple-input...

In this work we propose two pseudo-random number generators (PRNG) based on the discrete Arnold map over the integer ring Z2^m. The first PRNG employ or-exclusive (XOR) and permutation between bits, discarding multiplication operations. The second PRNG proposes a methodology to increase the dimension of the generated sequences, increasing the rate...