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Syndrome-based channel quality or message structure determiner

  • US 5,936,972 A
  • Filed: 06/18/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 06/18/1997
  • Status: Expired due to Term
First Claim
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1. A syndrome-based channel quality or message structure determiner for use in a communication system receiver comprising:

  • a first digital demodulator, for demodulating a received digital signal to produce a first demodulated received signal;

    a first symbol-by-symbol detector, coupled to the first digital demodulator, for computing a first hard-decision vector from the first demodulated received signal;

    a first syndrome calculator, coupled to the first symbol-by-symbol detector, for using a first scalar parity check matrix to compute a first syndrome vector from the first hard-decision vector;

    a first syndrome pattern memory for storing a first syndrome pattern and an associated first error weight; and

    a first syndrome error estimator, coupled to the first syndrome calculator and the first syndrome pattern memory, for locating and removing the first syndrome pattern from the first syndrome vector and calculating a first quality estimation from the first error weight.

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