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Soft-in soft-out decoder

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A soft-in soft-out (SISO) decoder is a type of 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.

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

See also

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