Recently a new technique that used parametric amplification in optical fibers to combine two binary signals into a single quaternary amplitude-shift keyin...

• A. L. A. Costa
• J. D. Marconi
• F. R. Barbosa
• E. Moschim
• M. L. F. Abbade

• Optical signal processing
• parametric amplifiers (PA)
• quaternary-amplitude shift keying (4 - ASK)

SBrT 2010

A performance analysis in terms of the bit error rate for digital systems with co-channel interference is done. In order to evaluate the effects of the int...

• Daniel Altamirano
• Celso de Almeida

• 2-PAM
• BPSK
• Co-Channel Interference
• SIR
• BER

SBrT 2010

Nowadays, implement security in P2P systems is a great challenge. The possibility of building an infrastructure of public keys (PKI) operating in P2P envi...

• Francisco Sales de Lima Filho
• Sergio Vianna Fialho

• P2P
• PKI
• PKIX
• Trust-based reputation
• Information Security
• Digital certification
• JXTA

SBrT 2010

In this paper, a performance analysis for QPSK, 16- QAM and 64-QAM, modulations in the presence of co-channel interference is made. At first, an expression...

• Edgar Benítez
• Gina Quelal
• Diana Moya
• Daniel Altamirano
• Celso de Almeida

• M-PAM
• Q-PSK
• M-QAM
• Co-Channel Interference
• SIR
• BER

SBrT 2010

In the context of space-time block codes (STBCs), the theory of hyperbolic lattices over totally real number field is presented, as well as theoretic crit...

• Edson Donizete de Carvalho
• Antonio Aparecido de Andrade

SBrT 2010