• OpenAccess
  • Performance Comparison of Three Algorithms Applied to UM2000 Signal Demodulation  [CSIP 2013]
  • DOI: 10.4236/jsip.2013.43B010   PP.58 - 61
  • Author(s)
  • Zhichao Qiao, Fuping Wang
  • UM2000 signal is a type of multi-audio frequency-modulated signal which is widely used for railway blocking. Principles of three typical demodulating algorithms are presented in details in this paper. Bit error rates of the three methods at different SNRs are achieved by Monte Carlo simulation experiments. Among the three algorithms, the quadrature demodulation has the best performance at the real working environment. However, the three methods have the same problem of phase hopping when noise is too strong.

  • UM2000 Signal; Differential Frequency Detection; Zero-Crossing Detection; Quadrature Demodulation
  • References
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    L. Zhu and S. Wu, “Digital Demodulation Method for Multi-tone FM Signal in Track Circuit System,” China Railway Science, Vol. 26, No. 5, 2005, pp. 91-95.
    G. Hu, “Digital Signal Processing,” 2nd Edition, Tsinghua University Press, Beijing, 2003.
    L. Nan, “Brief Introduction of Communication Principles,” Tsinghua University Press, Beijing, 2000.
    F. Wang, “Study on the Decoding Arithmetic of the UM2000 Track Circuit Signal,” Mater’s Thesis, China Academy of Railway Sciences, Beijing, 2010.

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