Optimal transmit spectra for communication in the presence of crosstalk and imperfect echo cancellation

N. Ahmed, R. G. Baraniuk, D. P. Shaver

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In many communication systems, including Digital Subscriber Lines, performance is severely limited by crosstalk interference. Previous work has presented a general framework for designing optimal transmit spectra for crosstalk avoidance. The technique uses the channel, noise, and interference characteristics to setup and solve an optimization problem which maximizes the capacity of neighboring lines, while maintaining spectral compatibility with other services. This joint signaling and optimal power distribution technique yields significant performance gains over conventional fixed spectra in terms of bit-rates and performance margins. In general, the spectra that result from this scheme have both an echo cancelled and frequency division multiplexed region. To ease the analysis, this technique assumed that the echo canceller has perfect echo rejection capability, which in practice is not true. In this paper, we propose an extension to these techniques, in which we factor the performance of practical echo cancellers into the optimization procedure. When echo rejection is not perfect, as is generally the case, our technique shows significant performance gains over previous techniques. As the performance of the echo canceller increases, our technique converges to the same solution.

Original languageEnglish (US)
Title of host publication2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era, ETS 2001 - Symposium Digest
EditorsPeter Winson
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages17-21
Number of pages5
ISBN (Electronic)0780371615, 9780780371613
DOIs
StatePublished - 2001
EventIEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era, ETS 2001 - Richardson, United States
Duration: Sep 10 2001Sep 11 2001

Publication series

Name2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era, ETS 2001 - Symposium Digest

Other

OtherIEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era, ETS 2001
CountryUnited States
CityRichardson
Period9/10/019/11/01

Keywords

  • Digital Subscriber Line (DSL)
  • capacity
  • crosstalk
  • echo canceller
  • power distribution
  • transmit spectra
  • waterfilling

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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