Application of chaotic modulation technique as an alternative to telecommunications spread spectrum systems

Author(s)

José Carlos Pizolato Junior

• Document type: Master's Dissertation
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
• Defense date: 2001-08-08

Examining board members

Luiz Gonçalves Neto; José Roberto Castilho Piqueira; Hildebrando Munhoz Rodrigues

• Advisor: Luiz Gonçalves Neto

Abstract

Nowadays it is increasing the interest in the application of the chaotic systems in the ambit of the telecommunications. These systems introduce some peculiarities, such as generation of wideband signals with low crosscorrelation, those characteristics make the systems strongly robust to application on chaotic modulation schemes. Among such schemes, there are ones where the detection is realized using techniques of synchronization. In this work, a chaotic circuit is introduced and its performance is evaluated. The Pecora-Carroll synchronization and error-feedback synchronization are applied on the chaotic circuit introduced. Using this chaotic circuit, the following applications are suggested: a chaotic cipher and a spread spectrum system. The two systems are implemented electronically. Besides, the performance of each system is evaluated using the eye pattern technique. (AU)