Design and simulation of a modified perturbed digital chaotic signal generator for secure data communication

In this paper, we propose a new chaotic map, reconfigurable perturbed piecewise linear chaotic map (PWLCM) modified from perturbed PWLCM to be used in secure communication. The ship map is used as PWLCM in the proposed system. The principal difference between a chaotic carrier and a conventional periodic carrier is that the sample function for a given symbol is non periodic and is different from one symbol interval to the next. Thus, the transmitted waveform is never periodic, even if the same symbol is transmitted repeatedly. The main advantages of chaos are the increased security of the transmission and ease of generation of a great number of distinct sequences. As consequence, the number of users in the systems can be increased. The performance of the proposed system is simulated by Matlab provides indicate approximately zero cross correlation, Δ-like auto-correlation and super wide spread spectrum. The reconfigurable perturbed PWLCM that used in this paper provide long cycle width with excellent statistical properties in comparison with traditional perturbed PWLCM.