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US 7,584,409 B2Granted
Method and device for alternately decoding data in forward and reverse directions
AssigneeNEC Electronics Corporation
InventorMasao Orio
Life of this patent
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Abstract
A decoding device according to the one embodiment of the invention includes: a first decoder performing a first decoding based on first encoded data obtained by encoding unencoded data, and second soft-output data to generate first soft-output data; a second decoder performing a second decoding based on second encoded data obtained by interleaving the unencoded data and encoding the interleaved data, and the first soft-output data to generate the second soft-output data; and a hard decision part outputting decoded data through hard decision on the first soft-output data.
Claims4
A decoding method comprising:
- obtaining first and second element codes through a transmission channel;
- performing a first decoding by calculating a and 13 path metrics in this order using the first element code and a first extrinsic information to store the a and 13 path metrics in a first memory;
- obtaining a second extrinsic information using the a and 13 path metrics stored in the first memory;
- performing a second decoding following the first decoding by calculating a β and α path metrics in this order using the second element code and the second extrinsic information to store the β and α path metrics in a second memory;
- obtaining the first extrinsic information using the 13 and a path metrics stored in the second memory;
- outputting a decoded sequence corresponding to the first and second element code based on a result of the second decoding;
- deinterleaving the second extrinsic information and outputting deinterleaved second extrinsic information after obtaining the second extrinsic information;
- and
- interleaving the first extrinsic information and outputting interleaved first extrinsic information after obtaining the first extrinsic information.
6 more elements
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