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Adaptive estimation and compensation technique of channel nulls over VDSL systems

Adaptive estimation and compensation technique of channel nulls over VDSL systems

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A simple compensation technique for channel nulls induced by bridged taps is proposed over very high-speed digital subscriber line (VDSL) systems. The lost signal components caused by bridged taps are compensated for by an adaptive filter the transfer function of which has poles at the null frequencies. Null frequencies are adaptively estimated using the minimum power criterion of the filter output. The decision-feedback equaliser (DFE) with the proposed filter showed a 4–5 dB mean square error improvement compared with the conventional DFE.

Inspec keywords: adaptive filters; decision feedback equalisers; adaptive estimation; digital subscriber lines; compensation; mean square error methods

Other keywords: very high-speed digital subscriber line; adaptive filter; poles; DFE; VDSL systems; decision-feedback equaliser; mean square error improvement; channel nulls; compensation technique; adaptive estimation; null frequencies; transfer function; bridged taps; minimum power criterion

Subjects: Filtering methods in signal processing; Subscriber loops; Communication channel equalisation and identification

References

    1. 1)
      • Wang, A., Werner, J.J., Kallel, S.: `Effect of bridged taps on channel capacity at VDSL frequencies', Proc. Int. Conf. on Communications, June 1999, Vancouver, Canada, 1, p. 236–245.
    2. 2)
      • Im, G.H., Werner, J.J.: `Effect of bridged taps at VDSL frequencies', ANSI T1E1.4/97-324, September 1997.
    3. 3)
      • V. Oksman , J.J. Werner . Single-carrier modulation technology for very high-speed digital subscriber line. IEEE Commun. Mag. , 82 - 89
    4. 4)
      • D.V.B. Rao , S.Y. Kung . Adaptive notch filtering for the retrieval of sinusoids in noise. IEEE Trans. Acoust. Speech Signal Process. , 791 - 802
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      • A. Nehorai . A minimal parameter adaptive notch filter with constrained poles and zeros. IEEE Trans. Acoust. Speech Signal Process. , 983 - 996
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      • L. Ljung , S. Gunnarsson . Adaptive and tracking in system identification—a survey. Automatica , 7 - 21
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