This paper compares the video quality performance of low definition (LD), standard definition (SD) and high definition (HD) video signals encoded with H.2...

• Wyllian B. da Silva
• Keiko V. O. Fonseca
• Alexandre de A. P. Pohl

• Dirac
• H.264/AVC
• Digital TV

SBrT 2010

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

• Elloá B. Guedes
• Francisco M. de Assis
• Bernardo Lula Jr.

• Blum-Micali Generator
• Quantum Attack
• Grover Algorithm

SBrT 2010

This paper evaluates the performance of quaternary LDPC codes associated to OFDM systems. The LDPC codes are based on a ring Z4 of integers modulo-4. Each...

• Maria Leopoldina M. N. S. Gonçalves
• Renato Baldini Filho

• Quaternary LDPC code
• OFDM
• frequencyselective fading

SBrT 2010

The State of Art for rank codes is presented. The theory and applications are considered.

• Ernst M. Gabidulin

• rank metric
• matrix rank code
• vector rank code
• random rank error
• rank row erasure
• rank column erasure
• fast decoding algorithm
• space-time code
• network coding
• public-key cryptography

SBrT 2010

In this paper we propose sub-optimum, reduced complexity decoding algorithms for convolutional codes. The algorithms are based on the minimal trellis repre...

• Daiana Nascimento Muniz
• Franco A. dos S. Pezzini
• Richard Demo Souza
• Cecilio Pimentel

SBrT 2010