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Sociedade Brasileira de Telecomunicações


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


A speech database for the study of Lombard effect in Brazilian Portuguese

The Lombard effect is related to the change in the way people speak in noisy environments in order to compensate the degradation of the audio signal. There...

SBrT 2010


An Innovation-Based Algorithm for Energy Conservation in Multihop Wireless Sensor Networks

We propose an energy-efficient algorithm for sensing a process f(x,y,t) using a multihop Wireless Sensor Network (WSN). The innovation-based algorithm aims ...

SBrT 2010


A Comparative Analysis of Vocoders for Communications in Portuguese

This paper analyzes the performance of voice encoders used for digital communications, especially in VoIP calls, for Brazilian Portuguese phonemes. The foc...

SBrT 2010


Performance Analysis of HARQ in WiMAX Networks Considering Imperfect Channel Estimation

Hybrid Automatic Repeat Query (HARQ) is an error correction technique that has become an integral part of most current broadband wireless standards such a...

SBrT 2010