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Equalization and decision-directed loops with trellis demodulation in high definition TV

  • US 6,775,334 B1
  • Filed: 11/03/1999
  • Issued: 08/10/2004
  • Est. Priority Date: 11/03/1998
  • Status: Expired due to Term
First Claim
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1. In a digital receiver,a feedforward equalizer (FFE) adapted to process a digital input signal, the FFE having a plurality of adjustable taps that control its frequency response;

  • a trellis decoder adapted to produce tentative evaluations of the processed input signal and an FFE error signal;

    a decision feedback equalizer (DFE) adapted to process the tentative evaluations;

    means for coupling the trellis decoder to the DFE to process the tentative evaluations;

    means for coupling a combination of the outputs from the FFE and the DFE to the trellis decoder; and

    means responsive to the FFE error signal from the trellis decoder for adjusting the taps of the FFE to reduce the error.

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