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Method and apparatus for reducing noise correlation in a partial response channel

  • US 5,995,561 A
  • Filed: 04/10/1996
  • Issued: 11/30/1999
  • Est. Priority Date: 04/10/1996
  • Status: Expired due to Term
First Claim
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1. A partial response channel comprising:

  • an equalizer having a first frequency response for shaping an input pulse signal into a target pulse signal, said first frequency response coloring an additive noise component of said input pulse signal and generating a correlated noise component of said target pulse signal;

    a detector receiving said target pulse signal and providing a binary data signal, said detector comprising;

    a plurality of detection decision circuits receiving said target pulse signal and providing a plurality of decision values, wherein at least one of said plurality of detection decision circuits comprises a finite inpulse response (FIR) filter having a set of coefficients maximizing a signal-to-noise ratio;

    a decoder having a plurality of state dependent threshold values, said decoder providing said binary data signal based on comparisons between said plurality of decision values and said state dependent threshold values;

    wherein said signal-to-noise ratio comprises a minimum distance error value of said target pulse signal divided by a square root of a noise variance at an output of said FIR filter.

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