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How Vectoring in G.fast May Cause Neighborhood Wars

Författare

  • Eduardo Medeiros
  • Thomas Magesacher
  • Per-Erik Eriksson
  • Chenguang Lu
  • Per Ödling

Redaktör

  • Abbas Jamalipour
  • Der-Jiunn Deng

Summary, in English

Emerging wireline transmission systems such as G.fast use bands up to around 200 MHz on short cables. A key enabler for achieving the aspired throughput of several hundred Mbit/s is joint processing of transmit signals in downstream direction as well as joint processing of receive signals in upstream direction through techniques referred to as vectoring. A new challenge in such systems are sudden and severe changes in the channel matrix caused by changing terminations on lines outside the vectoring group. Such events can be caused by users disconnecting their modems, turning them on or off, or on-/off- hook events on lines that still support the plain old telephony service.

This work presents channel measurements capturing the impact of termination changes caused by modems or handsets. An analysis of the impact of these sudden changes on the signal- to-noise-power-ratio in vectoring systems reveals that throughput and stability can be seriously degraded. The potential of decision- directed channel tracking based on least squares estimation is investigated.

Publiceringsår

2014

Språk

Engelska

Sidor

3865-3870

Publikation/Tidskrift/Serie

[Host publication title missing]

Dokumenttyp

Konferensbidrag

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Nyckelord

  • G.fast
  • Vectoring
  • DSL
  • channel tracking

Conference name

IEEE International Conference on Communications (ICC), 2014

Conference date

2014-06-10 - 2014-06-14

Conference place

Sydney, Australia

Status

Published

Forskningsgrupp

  • Broadband Communication

ISBN/ISSN/Övrigt

  • ISBN: 978-1-4799-2003-7