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Breaking Chaotic Direct Sequence Spreading Spectrum Signals Under the Multipath Fading Channel

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Abstract

In order to break chaotic direct sequence spreading spectrum (CD3S) signals under the multipath fading channel, a particle filter based algorithm combining blind channel equalization with chaos fitting is proposed. To implement this algorithm, the intruder substitutes a different chaotic equation into the state-space equations of the channel and the chaos fitting, and then multiple particle filters are used for blind channel equalization and chaos fitting simultaneously by implementing them in reciprocal interaction. As a result, the impact brought about by the multipath fading channel and additive noises can be overcome. Furthermore, the range-differentiating factor is used to make the inevitable chaos fitting error advantageous based on the chaos fitting method. Thus, the CD3S signals can be broken according to the range of the estimated message. Simulations show that the binary message signal can be extracted from the CD3S signals without any knowledge of the chaotic transmitter’s structure, parameters, initial value, or the channel characteristics.

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Authors and Affiliations

  1. Department of Instrument Science and Technology, College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan Province, 410073, P.R. China

    Ting Li, Dexin Zhao, Zhiping Huang, Shaojing Su, Chunwu Liu & Zhen Zuo

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  1. Ting Li
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  2. Dexin Zhao
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  3. Zhiping Huang
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  4. Shaojing Su
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Correspondence to Ting Li.

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Li, T., Zhao, D., Huang, Z. et al. Breaking Chaotic Direct Sequence Spreading Spectrum Signals Under the Multipath Fading Channel. Circuits Syst Signal Process 33, 973–986 (2014). https://doi.org/10.1007/s00034-013-9666-4

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  • DOI: https://doi.org/10.1007/s00034-013-9666-4

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