On the formation of extrinsic information in turbo decoding

TitleOn the formation of extrinsic information in turbo decoding
Publication TypeConference Paper
Year of Publication2001
AuthorsJohnston, L. A., V. Krishnamurthy, and L. Davis
Conference NameInformation Theory, 2001. Proceedings. 2001 IEEE International Symposium on
KeywordsBaum-Welch update, extrinsic information formation, extrinsic update, Iterative Decoding, memoryless nonlinear function, nonlinear functions, transition probability estimate, turbo codes, turbo decoding

The extrinsic update at each iteration in the turbo decoding algorithm (TDA) is shown to be a memoryless, nonlinear function of the change in transition probability estimate produced by a Baum-Welch update to the same system. Thus the passage of extrinsic information is formulated in terms other than the removal of `redundant' information


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