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Coherent Synchronization of a Chaotic Communication System Based on a QAM-4 Transmitter

  • Roxana Burghelea
  • Jean Philippe Mangeot
  • Frédéric Launay
  • Patrick Coirault
  • Safwan El Assad
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5099)

Abstract

Remarkable research efforts have been invested in recent years on the chaotic communications schemes. In this paper we propose a modulation technique based on QAM-4 (Quadrature Amplitude Modulation). The data is split into I and Q channels. Each channel is spread by chaotic sequences generated over a fixed time interval by a specific digital chaotic system. There are two principal advantages of introducing the chaos in a communication scheme. The first is that it allows signals to be transmitted in a secure way, so that the signal could be perceived as a noise for a potential intruder. Secondly, the spread-spectrum characteristics of the signal improve the noise rejection propreties. A new coherent receiver structure is presented to synchronize each channel. Simulation results are presented to show the effectiveness of the proposed scheme.

Keywords

Chaotic Sequence Spread Spectrum Signal Receive Code Transmitted Code Chaotic Communication 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Roxana Burghelea
    • 1
  • Jean Philippe Mangeot
    • 1
  • Frédéric Launay
    • 1
  • Patrick Coirault
    • 1
  • Safwan El Assad
    • 2
  1. 1.LAII - ESIPPoitiersFrance
  2. 2.Laboratoire IREENA, Batiment IRESTEPolytech’NantesNantesFrance

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