Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1357-1362.doi: 10.13229/j.cnki.jdxbgxb20180185

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Frequency estimation of minimum shift keying signal based on dual chaotic oscillator

Yong LIU1(),Fang⁃shun DENG1,Xiao⁃lin LIU1,Si⁃jie MIN2,Peng WANG3   

  1. 1. Laboratory of Low?frequency Electro?magnetic Communication Technology with the 722 Research Institute, China Shipbuilding Industry Corporation, Wuhan 430079, China
    2. School of Electronic and Electrical Engingeering，Wuhan Textile University，Wuhan 430200, China
    3. Signal and Information Processing Provincial Key Laboratory in Shandong, Naval Aviation University, Yantai 264001, China
  • Received:2018-02-08 Online:2019-07-01 Published:2019-07-16

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Abstract:

To solve the problems in the existing methods on estimating the frequency of MSK signals, especially under the condition of low signal-to-noise ratio (SNR), an algorithm of frequency estimation based on dual chaotic oscillator is proposed. By considering both the dynamic frequency of the chaotic oscillator system and the frequency of the signal to be measured, the chaotic oscillator’s characteristics of signal sensitivity and noise immunity are fully utilized to realize the signal frequency effective estimation under the low SNR conditions. Theoretical analysis and experiments show the effectiveness of the algorithm. Compared with the classical phase locked loop (PLL) and 2P-POWER methods, the new algorithm can accurately estimate the signal frequency under the condition of low SNR (eg. Eb/N0= 0 dB), and the relative error is under 10-2 orders of magnitude.

Key words: communication technology, frequency estimation, chaos, Duffing oscillator, minimum shift keying(MSK), Doppler shift

CLC Number: 

  • TN911.72

Fig.1

Model of chaotic frequency estimation"

Fig.2

Diagram of driving force frequency and variance"

Fig.3

Relative error varies with Eb/N0"

Fig.4

Relative error varies with length of signal"

Fig.5

Relative error varies with step size of driving force"

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