turbo decoding

Is sova decoder and log-MAP decoder is same in turbo decoding?

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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 on 27 Oct 2016
"APP" appears to mean "a-posteriori probability" in this context.

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Answers (1)

Walter Roberson
Walter Roberson on 29 Aug 2011

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No, they are not.

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Walter Roberson
Walter Roberson on 27 Oct 2016
They are completely different algorithms.
"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:

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on 29 Aug 2011

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on 27 Oct 2016

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