Orientadores: Hugo Enrique Hernández Figueroa, Arismar Cerqueira Sodré Junior / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-20T11:51:13Z (GMT). No. of bitstreams: 1 Lona_DanielGrandin_M.pdf: 5547359 bytes, checksum: 1dfde15018aecd3aee7c7be413e9c669 (MD5) Previous issue date: 2012 / Resumo: O objetivo deste trabalho é avaliar a aplicabilidade da tecnologia Radio sobre Fibra (Radio over Fiber - RoF) em redes de sensores sem-fio (Wireless Sensor Networks - WSNs) e Wi-Fi. Inicialmente, realizou-se uma detalhada análise analítica de desempenho dos sistemas em função dos parâmetros típicos de equipamentos RoF, tais como: freqüência de operação, figura de ruído, ruído de intensidade relativa do laser, ruído shot do fotodetector, ruído térmico e modulação óptica. Os sistemas analisados foram então implementados em laboratório nas faixas de freqüência de 915 MHz e 2,4 GHz para WSN e Wi-Fi, respectivamente. Os parâmetros de desempenho medidos foram a indicação de intensidade de sinal recebida (Received Signal Strength Indication - RSSI), taxa de perda de pacotes (Packet Error Rate - PER) e vazão (Throughput) / Abstract: This works aims to evaluate the applicability of Radio over Fiber (RoF) technology in Wireless Sensor Networks (WSNs) and Wi-Fi networks. Initially, the system performance has been analytically evaluated as a function of diverse parameters from RoF pieces of equipment, such as: operation frequency, noise figure, relative intensity noise, shot noise of photodetector, thermal noise and optical modulation. Furthermore, the proposed RoF systems were experimentally implemented in laboratory at 915 MHz and 2.4 GHz bands for WSN and Wi-Fi, respectively. The performance metrics were Received Signal Strength Indication (RSSI), Packet Error Rate (PER) and throughput / Mestrado / Telecomunicações e Telemática / Mestre em Engenharia Elétrica

In this thesis we provide a model for a bufferless optical burst switching (OBS) and an optical packet switching (OPS) network. The thesis is divided in three parts. <p><p>In the first part we introduce the basic functionality and structure of OBS and OPS networks. We identify the blocking probability as the main performance parameter of interest. <p><p>In the second part we study the statistical properties of the traffic that will likely run through these networks. We use for this purpose a set of traffic traces obtained from the Universidad Politécnica de Catalunya. Our conclusion is that traffic entering the optical domain in future OBS/OPS networks will be long-range dependent (LRD). <p><p>In the third part we present the model for bufferless OBS/OPS networks. This model takes into account the results from the second part of the thesis concerning the LRD nature of traffic. It also takes into account specific issues concerning the functionality of a typical bufferless packet-switching network. The resulting model presents scalability problems, so we propose an approximative method to compute the blocking probability from it. We empirically evaluate the accuracy of this method, as well as its scalability. / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished