Complexity Analysis and DSP Implementation of the Fractional-Order Lorenz Hyperchaotic System

• Published in: Entropy (Basel, Switzerland) Vol. 17; no. 12; pp. 8299 - 8311
• Main Authors: Shaobo He, Kehui Sun, Huihai Wang
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-12-2015
• Subjects: Adomian decomposition method; Complexity; DSP; Fractional-order calculus; Lorenz Hyperchaotic system
• ISSN: 1099-4300
• DOI: 10.3390/e17127882

The fractional-order hyperchaotic Lorenz system is solved as a discrete map by applying the Adomian decomposition method (ADM). Lyapunov Characteristic Exponents (LCEs) of this system are calculated according to this deduced discrete map. Complexity of this system versus parameters are analyzed by LCEs, bifurcation diagrams, phase portraits, complexity algorithms. Results show that this system has rich dynamical behaviors. Chaos and hyperchaos can be generated by decreasing fractional order q in this system. It also shows that the system is more complex when q takes smaller values. SE and C 0 complexity algorithms provide a parameter choice criteria for practice applications of fractional-order chaotic systems. The fractional-order system is implemented by digital signal processor (DSP), and a pseudo-random bit generator is designed based on the implemented system, which passes the NIST test successfully.