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Sociedade Brasileira de Telecomunicações

2010 - VII International Telecommunications Symposium

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

Mean Weight Behavior for the Generalized Subband Decomposition LMS Algorithm

This paper presents an improved stochastic model for the generalized subband decomposition least-mean-square (GSD-LMS) algorithm. This algorithm is used as...

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

An Adequate Objective Performance Evaluation of Dirac Video Codec Compared to H.264/AVC

Dirac, a relevant new open wavelet-based video codec, has been released recently. The main contribution of this paper is an adequate performance evaluation...

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