XXXIII Simpósio Brasileiro de Telecomunicações

In this work, a novel cooperative scheme is presented and an optimization is proposed for wireless communications systems with multiple relay channels (MARC ). The scheme aims at making the MARC systems more compatible with the current ones, by rendering its presence transparen t to the source nodes, thus significantly reducing the complexit y...

This paper presents the results of field measurements and computer simulation of the interference from LTE system in the Digital TV in the 700 MHz band. The measurement s campaign results were used to validate the use of SEAMCAT software to simulate this interference problem. The software tool was then used for the characterization of the measurement...

In this work, we introduce a new method for approximating the probability density function of sums of positive random variables. In addition, as important application examples in wireless communications, we specialize the new method to sums of Nakagami- m and α - μ envelopes. In the proposed approach, the parameters of the approximate...

In modern wireless communication systems, TIADC arises as a good candidate for applications with high sampling rate and moderate power consumption requirements. However the performance of TIADC is impaired due to clock skew between the various ADCs. Clock skew performance degradation can be mitigated by fractional delay filters. Focusing on...

This work outlines the integration of a smart metering device with the novel Brazilian broadband powerline communication (PLC) system, which was recently developed t o fulfill the needs and demands related to smart grid communication and digital divide. With this regards, we discuss the developed hardware for interfacing with the smart metering device as...

This paper presents a stochastic model describing the behavior of the normaliz ed least-mean-square (NLMS) algorithm in a context for estimating time-varying systems. In particular, the proposed model is valid for white input data with Gaussian distribution and take into account scenarios in which the order of the adaptive filter is different from...

With the increasing amount of vehicles on the road, traffic jams pose a growing global problem. Traffic surveillance is a crucial step into improving traffic flow. This paper proposes a design and methodology for the estimation of occupancy and velocity of multiple vehicles on a single lane road segment using Radio Tomographic Imaging (RTI). RTI is...

This paper presents an analysis of signal blockers that minimize the interference between power line communication systems which operate on the same frequency in external and internal low voltage power grids.

This article proposes a nonlinear model with memory, based on bi-dimensional polynomial approxim ations, for the behavioral modeling of wireless transmitter s. Using experimental data measured on a GaN-based class AB transmitter, the accuracies of the proposed model a nd the generalized memory polynomial (GMP) are compared. T he GMP is a...

This is a conceptual approach of a work where we propose a support space of pixels to circular images from spherical surfaces using hyperbolic spaces. We work with three projections of this space on a hemisphere of a sphere and an image model that treat grey tones as Gaussian distribution considered in the Poincare half-plane H 2 with the Fisher metric....