中国物理B ›› 2003, Vol. 12 ›› Issue (4): 381-388.doi: 10.1088/1009-1963/12/4/307

• GENERAL • 上一篇    下一篇

Synchronization of the time-varying parameter chaotic system and its application to secure communication

牟静, 陶超, 杜功焕   

  1. State Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2002-07-01 修回日期:2003-01-03 出版日期:2005-03-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10074035 and 19834040).

Synchronization of the time-varying parameter chaotic system and its application to secure communication

Mu Jing (牟静), Tao Chao (陶超), Du Gong-Huan (杜功焕)   

  1. State Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • Received:2002-07-01 Revised:2003-01-03 Online:2005-03-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10074035 and 19834040).

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摘要： In this paper we propose and investigate the synchronization of a new chaotic model with time-varying parameters and apply it to improve the security of chaotic communication. In this model, the chaotic system is modulated by both the message and the varying parameters. The varying parameters distort the phase space so heavily that they prevent the carrier from being broken by nonlinear dynamic forecasting method. Theory and simulation experiments with speech signal communication indicate that the receiver can gain a perfect synchronization with the transmitter, and the intruder cannot break down this communication system. We also discuss the robustness of the new communication system.

Abstract: In this paper we propose and investigate the synchronization of a new chaotic model with time-varying parameters and apply it to improve the security of chaotic communication. In this model, the chaotic system is modulated by both the message and the varying parameters. The varying parameters distort the phase space so heavily that they prevent the carrier from being broken by nonlinear dynamic forecasting method. Theory and simulation experiments with speech signal communication indicate that the receiver can gain a perfect synchronization with the transmitter, and the intruder cannot break down this communication system. We also discuss the robustness of the new communication system.

Key words: time-varying parameter, chaotic synchronization, nonlinear dynamic forecasting

中图分类号:  (Synchronization; coupled oscillators)

  • 05.45.Xt
05.45.Gg (Control of chaos, applications of chaos) 05.45.Vx (Communication using chaos) 43.72.+q (Speech processing and communication systems) 84.40.Ua (Telecommunications: signal transmission and processing; communication satellites)