XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

As futuras redes móveis de quinta geração (5G) provavelmente irão operar na faixa de ondas milimétricas, com a finalidade de prover taxas superiores a 1 Gbps por usuário. Este artigo apresenta uma análise experimental da perda de percurso e do coeficiente de propagação em 28 e 38 GHz, que são faixas de frequências consideradas potenciais para...

This paper proposes two semi-blind receives for joint channel and symbol estimation in MIMO relay-based communication systems. These receivers are developed for a two-hop system, assuming a tensor coding at the source and relay nodes. The central idea of the proposed approach is on the rank-one tensor modeling of the received signal, which allows...

Machine learning (ML) has been seen as a great ally of security. All his potential to automate actions with some level of intelligence has called the attention of industry which is using it on security systems. However, attackers have also noted all ML potential. In a first moment, attackers have tried to fight MLbased security tools through the...

The Kernel Least-Mean-Square (KLMS) algorithm is a popular algorithm for adaptive nonlinear filtering due to its simplicity and robustness. In kernel-based adaptive filtering with finite order models, the statistics of the linear filter depend on the kernel and its parameters, as well as, on the input vector dictionary update rule that defines the...

Dynamic frequency correction systems for piezoelectric transducers can be implemented using techniques with artificial intelligence. This paper presents preliminary results of the implementation of a system that adjusts the excitation frequency of a transducer from an intelligent search done in a preloaded database. The information retrieved...

This article presents an analysis of base station power saving techniques in software defined radio platforms. This analysis is based on the USRP N210 platform and the OpenBTS software. The main objective of the article is to analyze, in a pratical way, the energy efficiency of methods cell zooming and sleep mode.

This paper aims to present the characteristics of an dielectric resonator antenna (DRA) made from alumina ceramic matrix (Al2O3) with the addition of titanium oxide (TiO2), the method used to improve the dielectric properties of the ceramic matrix favoring its use in microwave and RF circuits. After analyzing the results, it was confirmed the material as...

This paper presents the design and implementation of a simple transceiver test-bed for implementing and testing algorithms for impulsive UWB applications. The platform has been developed using low-cost off-the-shelf components. We have conceived a simple modular architecture that was targeted to low power, short-range applications. The test-bed is...

An important objective in the analysis of Pap smear images is automatic detection of a cell’s nucleus. Various methods that automatically detect the nuclei of cervical cells have been proposed to improve the analysis of screening test images. In this paper, we propose a Convolutional Neural Networksbased method that automatically detects the nuclei...

The use of RFID systems as sensing and identification systems is increasing in the last years. Along the reduction of costs, the study of RFID technology needs more research about the effects of temperature, humidity, altitude, vibration and some materials on its readability and operability. The effects of temperature and some materials in the...