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DMT bit allocation with imperfect TEQ

  • US 6,999,507 B2
  • Filed: 12/20/2000
  • Issued: 02/14/2006
  • Est. Priority Date: 12/23/1999
  • Status: Expired due to Fees
First Claim
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1. A method of determining interference between channels in a Digital Subscriber Line (DSL) transmission system employing Discrete Multitone (DMT) modulation comprising:

  • determining a power mask level per channel P(k);

    obtaining a channel impulse response (h(n)) after implementation of a time equalization (TEQ) algorithm;

    zeroing an integer number (M) of main coefficient values of the channel impulse response to produce a residual impulse response (h′

    (n));

    obtaining from the residual impulse response (h′

    (n) a corresponding residual impulse spectrum (H′

    (k));

    and multiplying the per channel power mask level and the residual impulse spectrum (H′

    (k)) to obtain a cross channel interference (I(k)) level.

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