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A feedforward tracking filter. Part 1: Principle and tracking behaviour

A feedforward tracking filter. Part 1: Principle and tracking behaviour

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  • Author(s): K.K. Lee 1 ; T. Le-Ngoc 2 ; V.K. Bhargava 3
    • View affiliations
    • Affiliations: 1: Dept of Electrical Engineering, Concordia University, Montreal, Canada
      2: Dept of Electrical Engineering, SR Telcom Inc., Montreal, Canada
      3: Dept of Electrical Engineering, University of Victoria, Victoria, Canada
  • Source: Volume 57, Issue 6, November December 1987, p. 262 – 271
    DOI:  10.1049/jiere.1987.0094 , Print ISSN 0267-1689, Online ISSN 2054-0361
© The Institution of Electrical Engineers
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Conventional tracking filters using feedback control encounter a hang-up problem when fast acquisition is required in high-speed TDMA systems. This paper introduces a feedforward tracking filter (FTF) which solves the hang-up problem. Using two identical bandpass filters (BPF5) and feedforward control to compensate both phase and frequency variations, this FTF provides fast acquisition and unconditional stability. Different BPF configurations used in the FTF scheme are evaluated and it is found that, for the same noise bandwidth of the BPF, the FTF using two identical double-tuned BPFs provides the best performance. The fast acquisition of the FTF is not degraded by the inter-burst-interference encountered in TDMA applications. The effects of misaligned BPFs on the tracking performance are studied analytically and experimentally.

Inspec keywords: band-pass filters; multi-access systems; tracking; filtering and prediction theory; time division multiplexing

Other keywords: bandpass filters; frequency variations; high-speed TDMA systems; feedforward tracking filter; tracking behaviour; feedback control; hang-up problem; phase variations

Subjects: Filters and other networks; Communication system theory; Signal processing and detection

References

    1. 1)
      • C.J. Wolejsza , D. Chakraborty . TDMA modem design criteria. COMSAT Tech. Rev. , 413 - 444
    2. 2)
      • P.H. Lewis , W.E. Weigarten . A comparison of second, third and fourth order phase-locked loops. IEEE Trans. on Aerospace and Electronic Systems , 4 , 720 - 727
    3. 3)
      • Feng, C.H., Xiong, S.X., Ge, L.D.: `Some discussions on fourth order phase-locked loops in narrow band tracking', 4th World Telecom. Forum, 29 October–1 November 1983, Geneva, 3.
    4. 4)
      • Gardner, F.M.: `Carrier and clock synchronization for TDMA digital communications', ESA TM-169 (ESTEC), European Space Agency Report, December 1976.
    5. 5)
      • A. Blanchard . (1976) , Phase-locked Loop Application to Coherent Receiver Design.
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      • F.M. Gardner . Hangup in phase-lock loops. IEEE Trans. on Communications , 10 , 1210 - 1214
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      • F.M. Gardner . (1979) , Phaselock Technique.
    8. 8)
      • Kurihera, H., Katon, T., Komizo, H., Nakamura, H.: `Carrier recovery with low cycle skipping rate for QPSK/TDMA systems', 5th Intl Conference on Digital Satellite Comm., March 1981, Genoa, Italy, p. 319–324.
    9. 9)
      • K.K. Lee , T. Le-Ngoc , V.K. Bhargava . A feedforward tracking filter. Part 2: Noise performance and applications. J. Instn Electronic & Radio Engineers , 6 , 272 - 280
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Correspondence
This article has following corresponding article(s):
A feedforward tracking filter. Part 2: Noise performance and applications
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