Date of Award
Fall 2002
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Electrical and Computer Engineering
First Advisor
Yaz, Edwin E.
Second Advisor
Josse, Fabien
Third Advisor
Feng, Xin
Abstract
A chaotic dynamical system is a deterministic nonlinear system that has noise-like state trajectories. This kind of dynamical system has the property that it is super sensitive to initial conditions and parameter perturbations. These unique properties of chaotic systems provide the means of applying chaotic signals to encrypt messages that are sent over unsecured channels. Even if the signal is intercepted, the noise-like nature of the chaotic signal will make it impossible to understand. In this work, the basic concepts about chaotic dynamics and chaotic synchronization are introduced as the background of our work. The main part of this thesis focuses on the development of various novel chaotic secure communication schemes that are based on nonlinear state estimation techniques, which are extended Kalman filter and state dependent Riccati equation filters. In particular, chaotic versions of digital signal masking, speech signal masking, digital signal modulation and demodulation and code-division multiple access techniques are developed.
Recommended Citation
Ruan, Huawei, "Secure Communications with Chaotic Synchronization by Using Nonlinear Estimators" (2002). Master's Theses (1922-2009) Access restricted to Marquette Campus. 4056.
https://epublications.marquette.edu/theses/4056