Propostas de um modelo para o tráfego de redes de comunicações e de funções de janela para o filtro FIR utilizado na tecnologia f-OFDM

• Ano de defesa: 2019
• Autor(a) principal: Silva, Maykon Renan Pereira da
• Orientador(a): Rocha, Flávio Geraldo Coelho
• Banca de defesa: Vieira, Flávio Henrique Teles, Lemos, Rodrigo Pinto, Santos Junior, Josemar Alves dos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Engenharia Elétrica e da Computação (EMC)
• Departamento: Escola de Engenharia Elétrica, Mecânica e de Computação - EMC (RG)
• País: Brasil
• Palavras-chave em Português: Autossimilaridade; Desempenho de rede; Eficiência espectral; Filtro sinc-janelado; Função de janela; Modelagem multifractal; Qualidade de serviço; Tráfegos de rede; OOBE; 5G
• Palavras-chave em Inglês: Self-similarity; Network performance; Spectral efficiency; Windowed-sinc filter; Window function; Multifractal modeling; Quality of service; Network traffic
• Área do conhecimento CNPq: ENGENHARIA ELETRICA::TELECOMUNICACOES
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/10224

In this work, in order to model the communication network traffic processes, we propose an efficient multifractal model that takes into account less parameters than other models present in the literature. The MEV (Exponential Modeling for Multiplier Variance) model is based on a multiplicative cascade in the wavelet domain capable of synthesizing traffic samples from communications networks that have characteristics such as self-similarity and wide Multifractal Spectrum Width (MSW). For this purpose, in the MEV model, the energy decay of the wavelet coefficients uses a parametric modeling based on an exponential distribution for the variance of multipliers along the cascade stages. The performance of the MEV model in describing the characteristics of network traffic is compared to other models in the literature. For this, real network traffic traces of communication networks are used. In addition, a class of adjustable Nakagami distribution based window functions is proposed for the construction of the windowed-sinc digital filter used by f-OFDM technology. To this end, the filter performance in terms of spectral efficiency and out-of-band emission (OOBE) is compared by analyzing power spectral density (PSD) results. In addition, the FIR filter processing time is verified using different window functions and the bit error rate (BER) in the data transmission process. The results obtained using f-OFDM are compared with those obtained through the unfiltered OFDM technology and also with the FBMC and UFMC technologies. The results obtained show that f-OFDM technology (especially using Nakagami windows) is a candidate for applications in future generations of mobile communication systems, as compared to OFDM technology, it maintains its advantages, for example ISI, while reducing one of its disadvantages, out-of-band emissions (OOBE).