XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais

A codificação wavelet de canal objetiva reduzir efeitos deletérios de canal de comunicação sem fio sobre um sinal transmitido e emprega comumente uma decodificação símbolo a símbolo. Este trabalho investiga o emprego de decodificador de Viterbi para códigos wavelet e compara, em termos da taxa de erro de bits, o desempenho do sistema operando sobre...

The RSA(Routing and Spectrum Allocation) is an optimization problem that aims at to attend traffic demands in a optical network under a given performance criterion. In this paper we address the static version of this problem in the flex-grid optical networks context and analyse the performance improvement of a VNS metaheurisc by using different...

Redes de sensores sem fio compõe-se de dispositivos com recursos limitados. A comunicação possui o maior consumo de energia, sendo importante otimizar o roteamento de dados. Apesar de propostas de protocolos cientes de energia, existe uma lacuna quando se trata do uso de energia como métrica de roteamento em redes de sensores sem fio definidas por...

In Brazil the number of people with disabilities in the academic world is increasing. This project aims to be an Assistive Technology aimed specifically at the large area of Chemistry, assisting the visually impaired through image processing on mobile devices. The application recognizes the color of chemical solutions using the camera of the mobile...

Uma importante questão na IoT envolvendo redes M2M é a conectividade dos sensores e atuadores. Em geral são utilizadas tecnologias de curto alcance em faixas de RF ISM, redes mesh e redes GSM, levando ao consumo de energia e eventualmente dispositivos complexos e caros. As redes LPWAN em faixas Sub GHz oferecem alternativas a estas...

The adoption of Additive Bernoulli-Gaussian Noise (ABGN) as an additive noise model for Power Line Communication (PLC) systems is the subject of this paper. ABGN is a model that for a fraction of time is a low power noise and for the remaining time is a high power (impulsive) noise. In this context, we investigate the usefulness of the ABGN as a model...

In this paper, we propose an iterative technique for canceling nonlinear distortions in cooperative OFDM systems AF. The proposed technique estimates and cancels the nonlinear distortions caused by the use of PAs at source and relay. With this technique the receiver will estimate the nonlinear distortions of the source and these estimates will aid...

Wireless sensor networks (WSN) is a technology commonly used for remote monitoring, tracking and detection applications. Since energy efficiency is a major concern in WSN, to know the remaining energy on each node could optimize the energy consumption. We propose a novel method to create an energy map for a Software-Defined Wireless Sensor Network...

Detecting threats on the Internet is a key factor in maintaining data and information security. An intrusion detection system tries to prevent such attacks from occurring through the analysis of patterns and behavior of the data flow in the network. This paper presents a distributed platform for detection and analysis of data in a large flux,...

This paper presents the development of an onesegment (1-seg) digital TV receiver for the Integrated Services Digital Broadcasting - Terrestrial (ISDB-T) standard, based on Software Defined Radio (SDR). The proposed receiver works in real-time and requires a computer and a low-cost device known as RTL-SDR, for the RF front-end, mixer and analog to...