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
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Data
2019-10-31
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Universidade Federal de Goiás
Resumo
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).
Descrição
Palavras-chave
Autossimilaridade , Desempenho de rede , Eficiência espectral , Filtro sinc-janelado , Função de janela , Modelagem multifractal , Qualidade de serviço , Tráfegos de rede , OOBE , 5G , Self-similarity , Network performance , Spectral efficiency , Windowed-sinc filter , Window function , Multifractal modeling , Quality of service , Network traffic
Citação
SILVA, M. R. P. 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. 2019. 105 f. Dissertação (Mestrado em Engenharia Elétrica e da Computação) - Universidade Federal de Goiás, Goiânia, 2019.