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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.

References

    1. 1)
      • Single-carrier modulation technology for very high-speed digital subscriber line
    2. 2)
      • Im, G.H., Werner, J.J.: `Effect of bridged taps at VDSL frequencies', ANSI T1E1.4/97-324, September 1997
    3. 3)
      • 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
    4. 4)
      • A minimal parameter adaptive notch filter with constrained poles and zeros
    5. 5)
      • Adaptive notch filtering for the retrieval of sinusoids in noise
    6. 6)
      • Adaptive and tracking in system identification—a survey
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