Soft information in concatenated codes

A new soft decision criterion is derived. This is useful in communication systems where the combination of modulation, interleaving, and error correction is used. The new algorithm is attractive to implement since traceback techniques can be used and only a little extra memory is required to obtain...

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Bibliographic Details
Published in:IEEE transactions on communications 1996-03, Vol.44 (3), p.284-286
Main Authors: Rislow, B., Maseng, T., Trandem, O.
Format: Article
Language:English
Subjects:
Bit error rate
Block codes
Concatenated codes
Convolutional codes
Error correction
Error probability
Interleaved codes
Maximum likelihood decoding
Maximum likelihood detection
Viterbi algorithm
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Summary:A new soft decision criterion is derived. This is useful in communication systems where the combination of modulation, interleaving, and error correction is used. The new algorithm is attractive to implement since traceback techniques can be used and only a little extra memory is required to obtain the soft information associated with every symbol. Furthermore, the operations involved are not recursive and the execution is time independent of the received signal quality. The performance of the new algorithm is typically within 0.25-0.1 dB (bit error rate (BER)=10/sup -1/) of that of a significantly more complex algorithm reported previously.
ISSN:0090-6778
1558-0857
DOI:10.1109/26.486319