Convergence analysis of downstream VDSL adaptive multichannel partial FEXT cancellation

Itsik Bergel, Amir Leshem

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In this paper we analyze an adaptive downstream multichannel VDSL precoder that is based on error signal feedback. The analysis presents sufficient conditions for precoder convergence and an upper bound on the precoder steady state error. The paper also considers and analyzes the case of partial FEXT cancellation. The analysis shows that in some scenarios (and in particular in mixed-length binders) the use of partial FEXT cancellation is crucial to achieve precoder convergence in a reasonable time. Based on this analysis we determine that convergence is achievable in most practical channels. These bounds also allow for the proper setting of the convergence parameters. The paper presents several simulations to demonstrate the theoretical results. In these simulations, setting the precoder parameters according to the analysis leads to convergence in less than 400 OFDM symbols.

Original languageAmerican English
Title of host publicationEuro ASIC 1991
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Electronic)0818621850, 9780818621857
StatePublished - 1991
Externally publishedYes
EventEuro ASIC 1991 - Paris, France
Duration: 27 May 199131 May 1991

Publication series

NameEuro ASIC 1991


ConferenceEuro ASIC 1991

Bibliographical note

Publisher Copyright:
© 2010 IEEE.


  • VDSL
  • VDSL2
  • crosstalk mitigation
  • digital subscriber line
  • linear precoding
  • multichannel transmission
  • vectored transmission


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