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Bit log likelihood ratio evaluation

  • US 7,660,368 B2
  • Filed: 01/11/2006
  • Issued: 02/09/2010
  • Est. Priority Date: 01/11/2005
  • Status: Expired due to Fees
First Claim
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1. In a wireless communications user terminal (UT), a method for generating bit log likelihood ratio (LLR) values for two-layered quadrature phase-shift keying (QPSK) turbo decoding, the method comprising:

  • receiving a two-layered QPSK signal with in phase (I) and quadrature (Q) components per symbol and with an energy ratio selected from a group comprising k12 and k22;

    selecting a mismatched energy ratio (k2) between k12 and k22; and

    generating said bit LLR values for the two-layered QPSK turbo decoding, using the mismatched k2 energy ratio and including determining said LLR values for four bits (b3, b2, b1, and b0), wherein determining the bit LLR values includes determining the bit LLR values for each b0 and b2 bit as follows;

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