Crosstalk channel estimation via standardized two-port measurements

  • Authors:
  • Fredrik Lindqvist;Neiva Lindqvist;Boris Dortschy;Per Ödling;Per Ola Börjesson;Klas Ericson;Evaldo Pelaes

  • Affiliations:
  • Department of Electrical and Information Technology, Lund University, Lund, Sweden;Signal Processing Laboratory, Federal University of Para, Belem, PA, Brazil;Ericsson Research, Broadband Technologies, Ericsson AB, Stockholm, Sweden;Department of Electrical and Information Technology, Lund University, Lund, Sweden;Department of Electrical and Information Technology, Lund University, Lund, Sweden;Ericsson Research, Broadband Technologies, Ericsson AB, Stockholm, Sweden;Signal Processing Laboratory, Federal University of Para, Belem, PA, Brazil

  • Venue:
  • EURASIP Journal on Advances in Signal Processing
  • Year:
  • 2008

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Abstract

The emerging multiuser transmission techniques for enabling higher data rates in the copper-access network relies upon accurate knowledge of the twisted-pair cables. In particular, the square-magnitude of the crosstalk channels between the transmission lines are of interest for crosstalk-mitigation techniques. Acquiring such information normally requires dedicated apparatus since crosstalk-channel measurement is not included in the current digital subscriber line (DSL) standards. We address this problem by presenting a standard-compliant estimator for the square-magnitude of the frequency-dependent crosstalk channels that uses only functionality existing in today's standards. The proposed estimator is evaluated by laboratory experiments with standard-compliant DSL modems and real copper access network cables. The estimation results are compared with both reference measurements and with a widely used crosstalk model. The results indicate that the proposed estimator obtains an estimate of the square-magnitude of the crosstalk channels with a mean deviation from the reference measurement less than 3 dB for most frequencies.