Encontrados 7 documentos, a visualizar página 1 de 1
Osciladores para Rádio Frequência de Elevada Estabilidade
João Manuel Tavares; João Nuno MatosThis article describes methods for high stability oscillators design using quartz crystal piezoelectric proprieties. It also presents a set of radio frequency oscillators whose construction principles obey to these methods. ; Este artigo descreve técnicas de projecto de osciladores de elevada estabilidade recorrendo às propriedades piezoeléctricas do cristal d...
Método Universal de Obtenção do Equivalente de Thevenin
João Nuno MatosAn alternative method to obtain Thevenin Equivalent of a linear resistive circuit is showed. This method is universal for any kind of linear resistive circuit. ; Neste artigo mostra-se como é possível obter de um modo universal o Equivalente de Thevenin dum circuito linear e resistivo.
Redes Domésticas
Alexandre Carreira; Vitor Canhão; João Nuno Matos; Vítor RibeiroThis paper describes the Home Networks Project integrated on a final project for a degree in engineering and inserts itself in the wider project “Casa do Futuro”.The first part shows the current approaches/technologies todistribute data within the home. Only binary debits over 10Mbps were considered (minimum speed for a Triple Play household implementation) on this study. The second part of the proj...
Implementation of the MAC Layer of a DSRC identification system
Daniel Fidalgo Morais; Ricardo Matos Abreu; João Nuno MatosDSRC (Dedicated Short Range Communications) is a well known widespread technology.One of the main applications of DSRC is RTTT (RoadTransport and Traffic Telematics), especially EFC(Electronic Fee Collection) on tolled roads, bridges or tunnels.Other vehicle-related applications had been envisaged, suchas car parking or fuel refilling automatic payment. Theseapplications were successfully developed, deployed an...
Medidor de Campo electromagnético selectivo na frequência para as bandas GSM900...
Carlos José Borda; Rogério Paulo Dias; Nuno Borges de Carvalho; João Nuno MatosThis paper describes the design, implementation and test of a frequency selective electromagnetic field meter for the GSM900 and GSM1800 bands developed on an engineering degree final project.We will start to introduce all the necessary background concepts such as: biological effects of electromagnetic radiation and reference exposure levels, near and far field and power measuremen...
Desenvolvimento de um Modelo de Simulação baseado na Camada Física do protocolo...
Homero Leal; Ricardo Pannuzzo; João Nuno Matos; Atílio Gameiro; O presente trabalho apresenta uma implementação de um simulador da camada física do sistema ETSI BRAN HiperLAN/2. O software de simulação foi desnvolvido sobre a ferramenta CoCentric System Studio recorrendo a linguagem C.
Simulador de Comunicação com Modulação Spread Spectrum
Valdemar Monteiro; João Nuno MatosIn this paper we present the description of the design of a spread spectrum communication simulator to analyse the system performance. The Spread Spectrum system that will be simulated is the CDMA - DS/SS BPSK.The performance will be evaluated by the probability of biterror in the communication simulation. ; Neste artigo descreve-se a construção de um simulador de comunica&cce...
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