turbo decoding

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anita
anita 2011-8-29
评论： Walter Roberson 2016-10-27
Is sova decoder and log-MAP decoder is same in turbo decoding?
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mohamed elganiny
mohamed elganiny 2016-10-27
another question about this please, is SOVA decoder is the APP decoder in matlab simulink , and if yes how i can get soft output values from SOVA decoder in simulink
Walter Roberson
Walter Roberson 2016-10-27
"APP" appears to mean "a-posteriori probability" in this context.

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回答（1 个）

Walter Roberson
Walter Roberson 2011-8-29
No, they are not.
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Walter Roberson
Walter Roberson 2016-10-27
They are completely different algorithms.
According to http://stats.stackexchange.com/questions/31119/posterior-probability-vs-viterbi-algorithm
"Viterbi gives most likely sequence, posterior (Forward-Backward) gives most likely state at each position. Which one you choose depends on what kind of errors you prefer -- if you care about the number of sequences you get correctly, then Viterbi algorithm is preferable, if it's the number of individual state errors, then, Forward-Backward is better."
You can find Sova implementations at:
https://www.mathworks.com/matlabcentral/fileexchange/3801-soft-input-soft-output-viterbi-algorithm
https://www.mathworks.com/matlabcentral/fileexchange/25293-matlab-for-digital-communication

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