Soft-in soft-out decoder

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A soft-in soft-out decoder (SISO decoder) is a type of soft-decision decoder used with error correcting codes.[1] "Soft-in" refers to the fact that the incoming data may take on values other than 0 or 1, in order to indicate reliability. "Soft-out" refers to the fact that each bit in the decoded output also takes on a value indicating reliability. Typically, the soft output is used as the soft input to an outer decoder in a system using concatenated codes, or to modify the input to a further decoding iteration such as in the decoding of turbo codes.

Examples include the BCJR algorithm and the soft output Viterbi algorithm.

## See also

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* Decoding methods
* Error detection and correction
* Forward error correction

## References

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1. ^ Andre Neubauer; Jurgen Freudenberger; Volker Kuhn (22 October 2007). Coding Theory.: Algorithms, Architectures and Applications. John Wiley & Sons. ISBN 978-0-470-51982-0.