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Block-adaptive equalization using partial decision feedback in digital broadcast communications

  • US 6,559,894 B2
  • Filed: 06/11/2001
  • Issued: 05/06/2003
  • Est. Priority Date: 10/21/1999
  • Status: Expired due to Term
First Claim
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1. A method of performing equalization on a signal received over a broadcast system, comprising:

  • providing a set of predetermined symbols that correspond to symbols in a data field synchronization segment of a data field having a plurality of segments wherein a data frame having at least two of these data fields is transmitted over the signal in the broadcast system during a block-time interval;

    correlating complex samples of the signal with the set of predetermined symbols to extract a corresponding impulse response during the block-time interval;

    selecting a phase identifying the start of the block-time interval from the correlated complex samples;

    estimating an equalizer filter using the set of predetermined symbols and an initial data field synchronization segment provided at the start of the block-time interval;

    updating the equalizer filter using subsequent complex samples of the signal to extract a subsequent impulse response and correlate with a reference segment, wherein the reference segment corresponds to either the predetermined symbol sequence or a partial decision feedback segment.

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