XXXIX Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

In this article, expressions for the power spectral density of signals transmitted by Chaos Shift Keying (CSK) are analytically derived. CSK is a digital modulation that uses chaotic signals. These results are important when considering the practical application of signals in communication systems and signal processing. Theoretical results are...

Redes de comunicações energizadas através de meios sem-fio ou, do inglês, Wireless Powered Communication Network (WPCN), consistem em um novo paradigma em que dispositivos móveis podem ser energizados através de ondas rádio em uma primeira fase, relaxando assim a necessidade de trocas de baterias. Posteriormente, em uma segunda fase, estes mesmos...

This work presents a joint strategy for feedback canceling and reduction of the occlusion-effect in hearing aids. Positive feedback and the occlusion-effect are undesired phenomena, in which, in general, efforts for attenuation of one correspond to amplification of the other. To avoid this antagonism, an active approach based on the Least Mean Square...

Interfaces cérebro-computador (BCI) são sistemas que, ao interpretar a atividade cerebral, fornecem um meio de comunicação alternativo, possibilitando diversas aplicações, principalmente para reabilitação. Nesse estudo, foi realizada uma avaliação de diferentes técnicas de estimação espectral aplicadas à extração de características para BCI no paradigma...

This paper presents a change detection algorithm (CDA) for multitemporal wavelength-resolution synthetic aperture radar (SAR) images based on U-NET convolutional neural network (CNN) architecture. The algorithm uses non-linear filtering to extract textural information from amplitude SAR images. Since we want to detect changes in multitemporal...

Providing active learning in signal processing is a relevant educational challenge. Open Educational Resources (OER) might foster practical activities that assist in student learning. In this article, a music processing experiment in a Python Notebook with local and cloud execution alternatives is presented to complement the theoretical education in...

In wireless communications, the propagation environment is not always favorable and may have several adverse conditions for data transmission and reception. The improper propagation conditions can be mitigated by the operator or by the current signal processing techniques. This classical paradigm can be rethought with the emerging concept of intelligent...

In this article, we discuss the platooning system and propose models for its implementation based on multilinear algebra. It is investigated a model with Khatri-Rao Space-Time (KRST) coding and another model that combine a Tensor Space-Time (TST) and Kronecker Space-Time (KronST) codings, using Parallel Factor Analysis (PARAFAC) and Tucker...

This paper investigates the Shannon and Rényi differential entropies over the weighted sum of squared Nakagami-m mutually independent random variables. Based on the probability density function (PDF) of the sum of Gamma variables, we provide, in terms of special functions, simple closed-form expressions for such entropy measures. Here, we also present...

A comunicação bidirecional simultânea por meio da técnica full-duplex (FD) permite que o tráfego escoe mais rapidamente em um enlace, diminuindo o acesso ao canal pelo enlace, reduzindo assim a interferência em uma rede. Por outro lado, a comunicação FD causa o aumento na interferência pelo aumento do número de transmissões. Nesse trabalho, investigamos...