Eurocode ’92 pp 331-338 | Cite as

New Techniques for Word Synchronisation

  • M. Darnell
  • M. Grayson
  • B. Honary
Part of the International Centre for Mechanical Sciences book series (CISM, volume 339)


This paper describes two techniques for identifying a known sequence, when embedded in random data and corrupted by additive noise. The first method is derived from the maximum likelihood algorithm. The original implementation of this ML algorithm uses amplitude-shift-keyed transmission and shows typical improvements of 3 dB over the simple correlator rule. An algorithm for using the maximum likelihood technique with frequency-shift-keyed transmission is derived which, in simulation trial, shows typical improvements of 2 dB at low signal-to-noise ratios, when compared with the simple correlator rule. The second technique presented improves the probability of sequence detection when soft decision information is not available in the detector. Instead of looking for a single peak, this approach searches for the entire auto-correlation function of the known sequence. Under certain conditions, the performance of such a scheme can approach that of the ML algorithm.


Random Data Matched Filter Simulation Trial Hard Decision Noise Standard Deviation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. [1]
    Massey, J. L.: ‘Optimum frame synchronization’, IEEE Trans. Comms., Vol. COM-20, No. 2, pp. 115–119Google Scholar
  2. [2]
    Barker, R. H.: ‘Group synchronizing of binary digital systems’, in Jackson, W. (Ed.), ’Communication theory’, Butterworth, London, 1953Google Scholar
  3. [3]
    Nielsen, P. T.: ‘Some optimum and suboptimum frame synchronizers for binary data in Gaussian noise’, IEEE Trans. Comms.,Vol. COM-21, pp. 770–772Google Scholar
  4. [4]
    Grayson, M. and Darnell, M.: ‘Improved FSK frame synchronisation’, Electronics Letters, Vol. 28, No. 20, pp. 1904–1905Google Scholar
  5. [5]
    Whalen, A. D.: Detection of signals in noise, Academic Press, New York, 1971, p. 204Google Scholar
  6. [6]
    Grayson, M. and Darnell, M.: Optimum synchronisation preamble design, Electronics Letters, Vol. 27, No. 1, pp. 36–38Google Scholar
  7. [7]
    Grayson, M. and Darnell, M.: ‘Adaptive synchronisation techniques for time-varying dispersive radio channels’, Proceedings of the 5th International Conference on ’HF Systems and Techniques’, July 1991, pp. 261–264Google Scholar
  8. [8]
    Grayson, M. and Darnell, M.: ‘Synchronisation preamble design: New results’, Electronics Letters, Vol. 26, No. 21, pp. 1775–1776CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Wien 1993

Authors and Affiliations

  • M. Darnell
    • 1
  • M. Grayson
    • 1
  • B. Honary
    • 2
  1. 1.University of HullHullUK
  2. 2.Lancaster UniversityLancasterUK

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