Open Access

Crosstalk Channel Estimation via Standardized Two-Port Measurements

  • Fredrik Lindqvist1Email author,
  • Neiva Lindqvist2,
  • Boris Dortschy3,
  • Per Ödling1,
  • Per Ola Börjesson1,
  • Klas Ericson3 and
  • Evaldo Pelaes2
EURASIP Journal on Advances in Signal Processing20092008:916865

https://doi.org/10.1155/2008/916865

Received: 21 September 2008

Accepted: 19 December 2008

Published: 8 February 2009

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.

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Authors’ Affiliations

(1)
Department of Electrical and Information Technology, Lund University
(2)
Signal Processing Laboratory (LaPS), Federal University of Para
(3)
Ericsson Research, Broadband Technologies, Ericsson AB

Copyright

© Fredrik Lindqvist et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.