A simple approach is proposed to tame chaos by injecting high-frequency signals, commonly called dithers, into the chaotic systems. Based on the relaxed method, an appropriate dither is introduced to suppress chaotic motion. If the frequency of dither is high enough, the trajectory described by the dithered chaotic system and the trajectory of its corresponding mathematical model — the relaxed ...

This paper reports on the design and chip measurements from synchronous coupled chaotic oscillators operating in subthreshold CMOS. Each uncoupled oscillator is autonomous and generates chaotic signals with three state variables. For commensurate bandwidth, the subthreshold designs utilize currents and capacitors over 200 times smaller than above threshold realizations. The reduced size makes s...

In a complete Chaotic radar ranging system, its effective range is often limited by the randomness of the chaotic signal itself and other transmission channel noises or interferences. In order to improve the precision and accuracy of radar ranging system, wavelet transform is proposed to remove different kinds of noise embedded in chaotic signals. White Gaussian noise, colored Gaussian noise as...

chaos-based encryption methods have been presented and discussed in the last two decades. In order to reach higher performance, these methods take advantage of the more and more complex behavior of chaotic signals. This paper contributes in this issue by comparing the performance of the well known piecewise linear chaotic map (PWLCM) with that of PWLCM perturbed by a new technique. Both chaotic...

The relationship between chaos and cryptography makes it natural to employ chaotic systems to design new cryptosystems. It is based on the facts that chaotic signals are usually noise-like and chaotic systems are very sensitive to initial conditions. Their sensitivity to initial conditions and their spreading out of trajectories over the whole interval seems to be a model that satisfies the cla...

In this paper, we present a new approach for real-time implementation of the Chen’s chaotic system on Field Programmable Gate Array (FPGA). The approach consists on using structural hardware description language (VHDL) with a fixed-point representation, contrary to some previous works which use somewhat non optimal VHDL code generation using automatic code generation tools. The obtained real-ti...

This paper presents a true random-bit generation through a continuous-time chaotic oscillator, which provides automatically chaotic signals and is fully implemented on 0.18 CMOS standard technology. Chaotic dynamics of the oscillator are exhibited in terms of chaotic strange attractor in phase-space domain. In order to achieve true-random property, a simple designed of post-processing method is...