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Soft-in soft-out decoder

A soft-in soft-out decoder (SISO decoder) is a type of soft-decision decoder used with error correcting codes. "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.

References

(22 October 2007). "Coding Theory.: Algorithms, Architectures and Applications". John Wiley & Sons.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

error-detection-and-correction

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