Turbo code decoder with parity information update

Details Turbo code decoder with parity information update Turbo code decoder with parity information update

2007-01-23

2007-01-23

Lamarre, Guy J. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S755000

Reexamination Certificate

active

10686774

ABSTRACT:
In a turbo code decoder (100, 100B), likelihood information for redundant parts of a received symbol sequence are used to update the redundant parts of the received symbol sequence for use by the decoder (100, 100B). The redundant likelihood update unit (101) comprises a first compare and update unit (2041) and a second compare and update unit (2042). The respective compare and update units (204) compare the likelihood information for their respective redundant part of the received symbol sequence with the original respective redundant part of the received symbol sequence, and obtain updated likelihood information for their respective redundant parts of the received symbol sequence.

REFERENCES:
patent: 6266795 (2001-07-01), Wei
patent: 1 432 129 (2004-06-01), None
Ariyoshi et al, “Iterative Decoding Algorithms Updating Likehood and Channel Values Bsed on Interim Hard Decision Results”, ISIT 2000, Sorrento, Italy. Jun. 25-30, 2000, pp. 174.
Patent Abstracts of Japan, vol. 200, No. 022, Mar. 9, 2001 & JP 19990301519 (Keio Gijuku), May 11, 2001.
International Search Report mailed Feb. 2, 2005 in corresponding PCT application No. PCT/SE2004/001439.
Berrou et al, “Near Optimum Error Correcting Coding and Decoding: Turbo-Codes”, IEEE Transactions on Communications, vol. 44, No. 10, Oct. 1996, pp. 1261-1271.
Valenti, “An Efficient Software Ratio Implementation of the UMTS Turbo Codec”.
Valenti, “An Introduction to Turbo Codes”.

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