Recently, an optimal noncoherent detection technique for chaos-shift-keying digital communication system has been proposed. It has been stated that computational intensity showed increases that were exponential with the spreading factor. In this Letter, we show that the implementation of the optimal detector can be made independent of the chaotic maps used, and that the computational intensity ...

The dynamics of globally coupled map lattices can be described in terms of a nonlinear Frobenius–Perron equation in the limit of large system size. This approach allows for an analytical computation of stationary states and their stability. The complete bifurcation behaviour of coupled tent maps near the chaotic band merging point is presented. Furthermore the time independent states of coupled...

Chaotic signals are potentially atractive in a wide range of signal processing applications. This paper deals with Bayesian estimation of chaotic sequences generated by tent maps and observed in white noise. The existence of invariant distributions associated with these sequences makes the development of Bayesian estimators quite natural. Both Maximum a Posteriori (MAP) and Minimum Mean Square ...

In this paper, statistical analysis of watermarking schemes based on correlation detection is presented. Statistical properties of watermark sequences generated by piecewise-linear Markov maps are exploited, resulting in superior watermark detection reliability. Correlation/spectral properties of such sequences are easily controllable, a fact that reflects on the watermarking system performance...

Preliminary communication In this paper we study watermarking algorithm for compressed images in the application of antiforgery in financial bills. First, the basic watermarking algorithm based on image edge information is studied. The encrypted watermark is converted into binary values and embedded into the edges, meanwhile the original edge shape is preserved from noticeable destruction. Seco...

A chaotic transmitter and a synchronized chaotic receiver have been designed in a 0.25um CMOS process. Both transmitter and receiver use conversions between voltage and time to implement nonlinear tent-map functions. The transmitter outputs chaotic pulse position modulated (C-PPM) data as a stream of 2.3V p-p pulses of <1ns duration. The chaotic receiver uses the timing information between puls...

Abstract— In this paper, we provide possible vulnerabilities of the algorithm set forth by Mohamed Amin et al. [Commun. Nonlinear Sci. Numer. Simulat. 15, 3484-97, (2010)]. They proposed a block cipher algorithm using chaotic Tent map. For the Feistel structure used there are a certain vulnerabilities that can be exploited to find out the rotations the plaintext goes through. For a small number...

This paper presents the implementation of digital chaotic signal generator “twisted map” based on reconfigurable LFSRs. The robust digital implementation eliminates the variation tolerance and electronic noise problems common in analog chaotic circuit. In this paper an improved piece-wise linear one-dimensional iterative map such as “twisted map” with reconfigurable LFSRs is used to generate th...

In this paper, statistical analysis of watermarking schemes based on correlation detection is presented. Statistical properties of watermark sequences generated by piecewise-linear Markov maps are exploited, resulting in superior watermark detection reliability. Correlation/spectral properties of such sequences are easily controllable, a fact that affects the watermarking system performance. A ...