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Self-time-delay synchronization of time-delay coupled complex chaotic system and its applications to communication

Author

Listed:
  • Fangfang Zhang

    (College of Control Science and Engineering, Shandong University, No. 17923 Jingshi Road, Jinan 250061, P. R. China)

  • Shutang Liu

    (College of Control Science and Engineering, Shandong University, No. 17923 Jingshi Road, Jinan 250061, P. R. China)

Abstract

Considering the time lag produced by the transmission in chaos-communication, we present self-time-delay synchronization (STDS) of complex chaotic systems. STDS implies that the synchronization between the time-delay system (the receiver) and the original system (the transmitter) while maintaining the structure and parameters of systems unchanged, thus these various problems produced by time-delay in practice are avoided. It is more suitable to simulate real communication situation. Aimed to time-delay coupled complex chaotic systems, the control law is derived by active control technique. Based on STDS, a novel communication scheme is further designed according to chaotic masking. In simulation, we take time-delay coupled complex Lorenz system transmitting actual speech signal (analog signal) and binary signal as examples. The speech signal contains two components, which are transmitted by the real part and imaginary part of one complex state variable. Two sequences of binary bits are converted into analog signals by2M-ary and zero-order holder, then added into the real part and imaginary part of one complex state variable. Therefore, the STDS controller is realized by one critical state variable. It is simple in principle and easy to implement in engineering. Moreover, the communication system is robust to noise. It is possible to adopt cheap circuits with time-delay, which is economical and practical for communication.

Suggested Citation

  • Fangfang Zhang & Shutang Liu, 2014. "Self-time-delay synchronization of time-delay coupled complex chaotic system and its applications to communication," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 25(03), pages 1-13.
    • Handle: RePEc:wsi:ijmpcx:v:25:y:2014:i:03:n:s0129183113501027
    DOI: 10.1142/S0129183113501027
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    Cited by:

    1. Fangfang Zhang & Rui Gao & Zhe Huang & Cuimei Jiang & Yawen Chen & Haibo Zhang, 2022. "Complex Modified Projective Difference Function Synchronization of Coupled Complex Chaotic Systems for Secure Communication in WSNs," Mathematics, MDPI, vol. 10(7), pages 1-14, April.
    2. Xuan-Toa Tran & Hee-Jun Kang, 2017. "Fixed-Time Complex Modified Function Projective Lag Synchronization of Chaotic (Hyperchaotic) Complex Systems," Complexity, Hindawi, vol. 2017, pages 1-9, July.

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