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Systems and methods for a multicarrier modulation system with a variable margin

  • US 8,374,226 B2
  • Filed: 01/26/2010
  • Issued: 02/12/2013
  • Est. Priority Date: 04/18/2000
  • Status: Expired due to Term
First Claim
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1. A multicarrier modulation communication system for digital subscriber line communication on wire line over a plurality of subchannels, wherein at least two subchannels are assigned different margins, each margin specifying an extra signal to noise ratio requirement per subchannel, the extra signal to noise ratio requirement per subchannel being in addition to what is required to maintain a specified bit error rate requirement, wherein the different margins are assigned during a training state based on expected temperature changes of the wire line, wherein the margin of a subchannel with a lower carrier frequency is lower than a margin of a subchannel with a higher carrier frequency, wherein the margins are at least one of an average margin and a subchannel specific margin, wherein the average margin is varied based on the length of the wire line.

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