Flávio H. T. Vieira

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real Internet e Ethernet, constatando sua eficiência em capturar a probabilidade de perda e a ocupação média de bytes no buffer. Verificamos que o limitante proposto para a probabilidade de perda de bytes é mais preciso do que o obtido pela Teoria dos Grandes Desvios. Abstract. In this paper, we investigate the queueing behavior of multifractal traffic(More)
In this paper a fuzzy autoregressive (AR) model described in [1] is used to model and predict high-speed network traffic. This model approximates a complex nonlinear time-variant process by combining linear local autoregressive processes using a fuzzy clustering algorithm. We propose a method to estimate the traffic effective bandwidth at regular intervals,(More)
1 Abstract— In this paper we propose a video traffic model based on a multifractal multiplicative cascade. In our proposal, we assume that the cascade multipliers can be efficiently described by autoregressive models in each cascade scale. This multiplicative cascade model with autoregressive process based multipliers is used for GOP (Group of Pictures)(More)
In this paper, we propose an adaptive allocation scheme which determines the number of time slots for each user in an OFDM/TDMA system using the Effective Bandwidth theory. For that purpose, we developed an algorithm to adaptively estimate the parameters of the MWM (Multifractal Wavelet Model) traffic model that allow us to calculate the effective bandwidth(More)
The growing number of applications that generate traffic VoIP (Voice over IP) requires that suitable models for this kind of traffic be used in order to better estimate the required network resources. In this paper, we propose the application of Gaussian mixtures adjusted by an adaptive algorithm EM (Expectation-Maximization) with selection of classes using(More)
– In this paper, we present an admission control scheme for an OFDM (Orthogonal Frequency-Division Multiplexing)/TDMA(Time Division Multiplexing Access) based wireless system taking into account the multifractal behaviour of the traffic flows. To this end, first, we show evidences of multifractal characteristics on wireless network traffic traces. These(More)