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DSL Technology

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Offers high-bit-rate digital information with the use of existing telephone infrastructure ... Wnew = Wold ve. Active Tap Detection ... – PowerPoint PPT presentation

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Title: DSL Technology


1
Adaptive Suppression of Crosstalk Between DSL
Data Cables
Author Cheng King Heng Supervisor John
Homer
  • DSL Technology
  • Offers high-bit-rate digital information with
    the use of existing telephone infrastructure
  • Most economical means of transporting
    high-bandwidth signal
  • VDSL is the latest DSL technology which offers a
    much better transmission rate and bandwidth.
  • METHOD LMS Adaptive Crosstalk cancellation
  • An adaptive process involving the automatic
    adjustment of the tap weights of the crosstalk
    equalizer according to the computed error
    estimation.
  • LMS Algorithm
  • Wnew Wold µve
  • Active Tap Detection
  • Many of the crosstalk channel taps are zero or
    negligible
  • More efficient approach because it detects the
    non-zero taps and only estimate them
  • Least square based detection employed and LMS
    based equalizer employed
  • Computational cost is same as standard LMS
  • Simulations Results
  • 8x8 crosstalk channel matrix with 10 Active taps
  • SNR 1, µ 0.01
  • Crosstalk within DSL cables
  • Interference caused by electromagnetic radiation
    of other phone lines in close proximity
  • Severe crosstalk limits the maximum data rate of
    any individual line and degrade overall
    performance of the system
  • This simulation results indicates that
  • they both have a similar convergence rate
  • LMS with active tap detection performs better in
    terms of Steady state error
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