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Computation of soft bits for a turbo decoder in a communication receiver

  • US 20070121763A1
  • Filed: 09/22/2004
  • Published: 05/31/2007
  • Est. Priority Date: 09/26/2003
  • Status: Active Grant
First Claim
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1. A method for computing a threshold Sthi used in demodulating a quadrature amplitude modulated (QAM) signal to generate a plurality of soft bits per received symbol for input to a turbo decoder, the method including the steps of:

  • computing the mean amplitude A of the received symbols; and

    multiplying the mean amplitude A by a constant Ci for a square QAM constellation with 4m points, such that
    Sthi=A×

    C
    i

    where m is a positive integer and I is a positive integer from 1 to (√

    {square root over (4m−

    1
    )})−

    1.

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