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Sociedade Brasileira de Telecomunicações


Quantum Permanent Compromise Attack to Blum-Micali Pseudorandom Generator

This paper presents a quantum permanent compromise attack to the Blum-Micali pseudorandom generator whose security is based on the assumption of intractabil...

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


A Packet Distribution Traffic Model for Computer Networks

The traditional traffic models which are based on conventional telephone traffic are not suitable for modeling selfsimilar traffic on computer networks. The...

SBrT 2010


OFDM Point-to-Multipoint Links at ISM 5 GHz Band: Experimental and Analytical Results

It is developed a case study, unifying theoretical and practical aspects, concerning planning and implementation of orthogonal frequency division multiplex...

SBrT 2010


Comparison of the Performance of Rain Attenuation Prediction Methods for Terrestrial Links

This paper presents the results of a comparative tests between rain attenuation prediction methods for terrestrial links. To perform the tests, experimenta...

SBrT 2010