ITERATIVE DECODER EMPLOYING MULTIPLE EXTERNAL CODE ERROR CHECKS TO LOWER THE ERROR FLOOR
First Claim
1. An iterative decoder, comprising:
- an internal code decoder operable to perform iterative decoding of a data block; and
an external code decoder capable of supplying a feedback signal to the internal decoder wherein the feedback signal is used to influence selective decisions during subsequent decoding iterations of the data block.
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Abstract
Iterative decoder employing multiple external code error checks to lower the error floor and/or improve decoding performance. Data block redundancy, sometimes via a cyclic redundancy check (CRC) or Reed Solomon (RS) code, enables enhanced iterative decoding performance. Improved decoding performance is achieved during interim iterations before the final iteration. A correctly decoded CRC block, indicating a decoded segment is correct with a high degree of certainty, assigns a very high confidence level to the bits in this segment and is fed back to inner and/or outer decoders (with interleaving, when appropriate) for improved iterative decoding. High confidence bits may be scattered throughout inner decoded frames to influence other bit decisions in subsequent iterations. Turbo decoders typically operate relatively well at regions where the BER is high; the invention improves iterative decoder operation at lower BERs, lowering the ‘BER floor’ that is sometimes problematic with conventional turbo decoders.
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Citations
20 Claims
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1. An iterative decoder, comprising:
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an internal code decoder operable to perform iterative decoding of a data block; and
an external code decoder capable of supplying a feedback signal to the internal decoder wherein the feedback signal is used to influence selective decisions during subsequent decoding iterations of the data block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An iterative decoder method, comprising:
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performing iterative internal decoding of a data block; and
feeding back external decoding information to influence selective decisions during subsequent internal decoding iterations of the data block.
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11. An iterative decoder, comprising:
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means for performing iterative decoding of a data block; and
means for supplying a feedback signal to the internal decoder wherein the feedback signal is used to influence selective decisions during subsequent decoding iterations of the data block. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An iterative decoder, comprising:
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an internal code decoder operable to perform iterative decoding of a data block; and
an external code decoder capable of supplying a feedback signal to the internal decoder;
wherein the feedback signal is used to influence selective decisions during subsequent decoding iterations of the data block; and
the internal code decoder comprises a turbo decoder that operates on at least one of a serial concatenated code, a parallel concatenated code, a hybrid serial/parallel concatenated code, and a turbo product code.
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Specification