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Sociedade Brasileira de Telecomunicações


A Traffic Policing Mechanism for Wimax Systems Based on Multifractal Modeling

In this paper, we analyze the queueing performance in terms of loss rate of an OFDM (Orthogonal FrequencyDivision Multiplexing)/TDMA(Time Division Multiplex...

SBrT 2010


Rank codes – the State of Art

The State of Art for rank codes is presented. The theory and applications are considered.

SBrT 2010


A New Model for VoIP Traffic Generation

In this work a new model for VoIP traffic generation is proposed. The innovation of this model consists in modeling the user behavior instead of the aggreg...

SBrT 2010


Lossless Multi-Grid Chain Code with Optimized Cell Usage for Contour Description of Visual Objects

In the context of object-based image compression, shape encoders that describe the contour of the objects, called chain codes, tend to be more efficient th...

SBrT 2010


Providing Higher Entropy Cryptographic Keys by the Use of Biometrics

In this paper modifications are investigated to a previously introduced Key Regeneration system used to obtain cryptographic keys from biometric data, spec...

SBrT 2010