XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

The organizations providing public services, should not work without the use of proprietary communication technologies and critical mission infrastructure, which provide, to their actions and operations, the absolutely necessary conditions to carry out their purposes. These requirements such as availability, reliability and scalability are vital to...

Sparse systems are common in the most diverse areas of application of adaptive filtering, in- cluding control, biomedical engineering and echo can- cellation. Algorithms capable of using this property to accelerate convergence and/or improve steady state error are gaining increasing prominence in the acade- mic community. Motivated by these...

Cognitive radio technology using adaptive modulation techniques has been widely proposed in the literature as a promising solution to improve the performance of telecommunications networks. A key issue in the adaptive modulation technique is finding the optimum switching points between modulations. In this paper, we considered a cognitive...

The theory of graph signal processing has been established over the last decade, with the purpose of generalizing tools from classical digital signal processing to the cases where the signal domain is an irregular network, modelled by an arbitrary graph. In this paper, we investigate the fractional shift of graph signals and, when dealing with ring...

The outstanding growth of location-based services and applications for mobile devices has motivated research about wireless positioning techniques for outdoor and indoor environments. In the present paper, a machine learning approach is proposed for finding the mobile user location. More precisely, a hybrid machine learning technique is proposed to...

The Dual Connectivity (DC) technology has gained a lot of momentum in the LTE Release 12 as a means to enhance the per-user throughput and provide mobility robustness. Some studies in the literature have discussed a coupling between the LTE and the air interface of the upcoming Fifth Generation (5G) in a DC scenario. That integration may provide...

This article proposes an adaptive radio resource allocation algorithm for the downlink of wireless communication systems that offer multiple services. The proposed algorithm is based on utility theory and aims to maximize the user satisfaction of all services in the system simultaneously while protecting the satisfaction of a given service with...

This work proposes the application of extreme learning machines to the problem of nonlinear system identifi- cation. Such structure constitutes a promissing option because it presents the capability of approximating nonlinear mappings and simplicity in the process of parameter adaptation. The proposed strategy is analyzed in a scenario related to...

A cifragem de dados com alta correlação, como imagens, é um desafio para cifras de bloco, já que padrões característicos dos dados poderão transparecer após cifrados. Isto decorre do mapeamento determinístico realizado pela cifra. Considerando a cifra AES como referência, neste trabalho é apresentada uma técnica de randomização desta cifra, empregando...

Este artigo investiga o efeito da interferência da rede primária sobre o desempenho de uma rede cooperativa-cognitiva, baseada no protocolo amplifica-e-encaminha. Visando explorar a diversidade multiusuário na rede secundária, quatro critérios diferentes de seleção do nó destino são considerados. Assume-se que a potência transmitida dos nós secundários...