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True bit level decoding of TTCM (turbo trellis coded modulation) of variable rates and signal constellations

  • US 8,473,822 B2
  • Filed: 11/30/2009
  • Issued: 06/25/2013
  • Est. Priority Date: 05/31/2002
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a metric generator that is operative to process a plurality of symbols of a signal having information bits encoded therein thereby generating a plurality of symbol metrics;

    a symbol metric decomposition module that is operative to decompose the plurality of symbol metrics to a plurality of bit metrics, such that each symbol metric of the plurality of symbol metrics is decomposed into a corresponding plurality of bit metrics;

    a decoder module that is operative to process, on a bit level basis, the corresponding plurality of bit metrics thereby generating a corresponding plurality of extrinsic values, such that each extrinsic value of the plurality of extrinsic values corresponds to one respective bit metric of the plurality of bit metrics; and

    a bit metric update module that is operative to update each bit metric of the plurality of bit metrics using a corresponding extrinsic value of the plurality of extrinsic values thereby generating a corresponding, updated plurality of bit metrics, such that each respective bit metric and corresponding extrinsic value corresponds to one respective bit of a plurality of bits within one respective symbol of the plurality of symbols; and

    wherein;

    the decoder module is operative to process, on a bit level basis, the corresponding, updated plurality of bit metrics thereby generating a corresponding, updated plurality of extrinsic values for use in making estimates of the information bits.

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