Hangup in asynchronous timing recovery loops

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Hangup in asynchronous timing recovery loops

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© The Institution of Electrical Engineers
Published

The effects of hangup in digital asynchronous timing recovery loops are investigated. It is demonstrated that delay quantisation in the interpolation filter exacerbates the problem of hangup. It is also noted that the effects of hangup are worse for the non-data aided (NDA) loops than they are for the decision-directed (DD) loops. This may preclude the use of the former in TDMA applications.

Inspec keywords: delays; errors; phase shift keying; digital radio systems; timing circuits; detector circuits; interpolation

Other keywords: delay quantisation; asynchronous timing recovery loops; TDMA applications; digital loops; nondata aided loops; interpolation filter; decision-directed loops; hangup

Subjects: Modulators, demodulators, discriminators and mixers; Radio links and equipment

References

    1. 1)
      • F.M. Gardner . Hangup in phase-lock loops. IEEE Trans. , 1210 - 1214
    2. 2)
      • D. Verdin , T.C. Tozer . Interpolator filter structure for asynchronous timing recovery loops. Electron. Lett. , 5 , 490 - 492
    3. 3)
      • F.M. Gardner . A BPSK/QPSK timing-error detector for sampled receivers. IEEE Trans. , 5 , 423 - 429
    4. 4)
      • Gardner, F.M.: `Demodulator reference recovery techniques suited for digital implementation', 6847/86/NL/DG, European Space Agency Final Report ESTEC Contract, 1988.
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