Flávio H. T. Vieira

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In this paper, we investigate the queueing behavior of multifractal traffic flows. Initially, we derive a global scaling parameter for multifractal processes. Next, we obtain a global scaling based expression for the effective bandwidth of multifractal flows. Relating this effective bandwidth estimate to the statistical network calculus, we propose(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 a fuzzy autoregressive (AR) model described in [1] is used to model and predict highspeed 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)
In this paper, we analyze the queueing performance in terms of byte loss rate of an orthogonal frequency-division multiplexing/time division multiple access based wireless system taking into account the multifractal behaviour of the wireless traffic flows. To this end, first, we show evidences of multifractal characteristics on wireless traffic traces.(More)
The seminal paper published by Leland et al. triggered a new direction on traffic modeling research, by unveiling the fractal nature of network traffic processes (Leland, Taqqu, Willinger, Wilson, & Bellcore, 1994). These authors experimentally demonstrated that the LAN Ethernet traffic collected in Bellcore Morristown Research and Engineering Center(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)
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)
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)
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