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Hyperchaos synchronization using PSO-optimized RBF-based controllers to improve security of communication systems

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Abstract

This paper studies the Lorenz hyperchaos synchronization and its application to improve the security of communication systems. Two methods are proposed to synchronize the general forms of hyperchaotic systems, and their performance in secure communication application is verified. These methods use the radial basis function (RBF)-based neural controllers for this purpose. The first method uses a standard RBF neural controller. Particle swarm optimization (PSO) algorithm is used to derive and optimize the parameters of the RBF controller. In the second method, with the aim of increasing the robustness of the RBF controller, an error integral term is added to the equations of RBF neural network. For this method, the coefficients of the error integral component and the parameters of RBF neural network are also derived and optimized via PSO algorithm. For better comparison, the proposed methods and an optimal PID controller optimized by PSO are applied to the Lorenz hyperchaotic system for secure communication. Simulation results show the effectiveness and superiority of the proposed methods in both performance and robustness in comparison with the PID controller.

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Authors and Affiliations

  1. Department of Electrical Engineering, Islamic Azad University, South Tehran Branch, P.O. Box 11365-4435, Tehran, Iran

    Mansour Sheikhan & Sahar Garoucy

  2. Modeling and Optimization Research Center in Science and Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran

    Reza Shahnazi

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  1. Mansour Sheikhan
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  2. Reza Shahnazi
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Correspondence to Mansour Sheikhan.

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Sheikhan, M., Shahnazi, R. & Garoucy, S. Hyperchaos synchronization using PSO-optimized RBF-based controllers to improve security of communication systems. Neural Comput & Applic 22, 835–846 (2013). https://doi.org/10.1007/s00521-011-0774-4

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