Arbitrary partial FEXT cancellation in adaptive precoding for multichannel downstream VDSL

Ido Binyamini*, Itsik Bergel, Amir Leshem

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In this paper, we present and analyze a simplified, adaptive precoder for arbitrary partial far-end cross talk (FEXT) cancellation in the downstream of multichannel VDSL. The precoder is based on error signal feedback and is computationally efficient. Furthermore, the partial precoding makes it possible to operate the precoder at any desired complexity, and the system's performance increases with any increase in system complexity. Unlike previous works, in which each user experienced either complete FEXT cancellation or no cancellation at all, the presented precoder can mitigate the FEXT from any desired subset of interfering users for each user. We derive sufficient conditions for convergence of the adaptive precoder, for any partial cancellation scheme, and provide closed form steady state error analysis. The precoder's performance and convergence properties are also demonstrated through simulations.

Original languageAmerican English
Article number6256755
Pages (from-to)5754-5763
Number of pages10
JournalIEEE Transactions on Signal Processing
Issue number11
StatePublished - 2012
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received July 13, 2011; revised February 27, 2012; accepted July 16, 2012. Date of publication August 01, 2012; date of current version nulldate. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Suleyman S. Kozat. This research was supported by the Israel Ministry of Labor, Trade and Commerce, as part of the iSMART consortium. Some of the results were presented at IEEE Sensor Array Multichannel Signal Processing Workshop (SAM), Israel, October 2010 [1].


  • Adaptive filters
  • DSL
  • MIMO


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