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Sociedade Brasileira de Telecomunicações

2010 - VII International Telecommunications Symposium



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


Performance comparison between single-carrier and OFDM using the cutoff rate

This article aims to establish a performance comparison between the Single Carrier with Cyclic Prefix (SCCP) and the Orthogonal Frequency Division Multiple...

SBrT 2010


Performance of WHT-STC-OFDM in Mobile Frequency Selective Channel

High data rate systems usually employ Orthogonal Frequency Division Multiplexing and Space-Time Coding to improve the performance on a mobile time-variant ...

SBrT 2010


Prediction-Based Coding of Speech Signals Using Multiscale Recurrent Patterns

This paper investigates the performance of the multidimensional multiscale parser (MMP) algorithm for speech coding. A new prediction-based scheme is cons...

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