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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


Mobile Station Location using Genetic Algorithm Optimized Radio Frequency Fingerprinting

Radio Frequency Fingerprinting estimates the mobile station location by comparing a measured radio frequency fingerprint with a set of previously collected...

SBrT 2010


Correcting Erasures and Errors in Random Network Coding

Rank-metric codes in matrix representation are used by Koetter, Kschischang, Silva in their theory of random network coding. They showed that the decoding pr...

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