Design of A Continuous-Time Autonomous Chaotic Circuit and Application of Signal Masking

Abstract

Chaos and chaotic systems have many fields of applications. One of the popular practical applications is secure communication. Chaotic signals depend on initial conditions very sensitively. Chaos-based secure communication systems have been the alternative of the standard spread-spectrum systems, since they are able to spread the spectrum of the information signals and simultaneously encrypt the information signals with chaotic circuitry which is simple and inexpensive. In this study, the circuit design of the continuous -time autonomous chaotic systems are explained in details based on nonlinear Thomas system(TS_96) which was introduced in 1996. In addition an example of the PSpice-based signal hiding implementation on the Lorenz system is given. The chaotic system equations of TS_96 are obtained, its chaotic circuit is designed, both its circuit design simulated in PSpice and is realized physically. For the signal hiding application with chaotic signal, the Lorenz system are considered, consequently its numerical simulations and electronical circuit simulations are realized in Matlab and PSpice environments.