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Sociedade Brasileira de Telecomunicações


An Optimal Path Stability Achieved By a Cross-Layer Proposal for Wireless Networks

This article presents an adaptive cross-layer solution for wireless networks. The main objective is to estimate the impact that different physical layer vari...

SBrT 2010


User Cooperation Using Multiple Antennas

This paper proposes user cooperation strategy using multiple antennas technology (MIMO). In a first model we used a Code Division Multiple Access (CDMA) sy...

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


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


Single shift-register for RFID tag secrecy

In this paper we present a new privacy scheme against passive adversaries based on the message modulation instead of classical cryptographic models for low...

SBrT 2010