Channel self-adapting iteration Turbo decoder system and method

Channel self-adapting iteration Turbo decoder system and method

  • CN 102,171,937 B
  • Filed: 09/16/2009
  • Issued: 05/18/2016
  • Est. Priority Date: 09/16/2008
  • Status: Active Grant
First Claim
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1. a channel self-adapting iteration Turbo decoder system, comprising:

  • The first and second MAP decoders, for calculating iteratively a group of window of received dataBranch metric, calculates forward recursive path status tolerance, calculates backward recursive path status tolerance, andAnd from the log-likelihood ratio of described forward direction and backward recursive path status metric calculation 1 and 0;

    At least one interleaver, for the decision bits that interweaves;

    Iteration count, for what count by the iteration of at least one execution of described MAP decoderNumber of times;

    Non-convergence detector, for only after the relevant iterations of predetermined channel, identifies non-convergenceThe window of received data in those decision bits, and, thereafter, only for described non-convergenceDecision bits, at least one that make described MAP decoder can be calculated received dataOne set of branch metrics, calculates forward direction and backward recursive path status tolerance, and from described forward direction and anti-To 1 and 0 log-likelihood ratio of each non-convergence decision bits of recurrence path status metric calculation,Described at least one interleaver described non-convergence bit that interweaves;

    AndWatch-dog device, for the non-convergence judgement ratio in response to from least one MAP decoderSpecial quantity, and in the time that the quantity of described non-convergence decision bits is less than threshold value, described in makingAt least one MAP decoder can be limited to each non-convergence decision bits path status degree aroundThe wicket reducing of amount, and 1 He of calculating each non-convergence decision bits from those path metrics0 log-likelihood ratio.

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