Recursive decoder for switching between normalized and...

Details Recursive decoder for switching between normalized and... Recursive decoder for switching between normalized and...

2006-10-10

2006-10-10

Lamarre, Guy (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S794000, C375S262000, C375S341000

Reexamination Certificate

active

07120851

ABSTRACT:
The present invention relates generally to error-correction coding and, more particularly, to a decoder for concatenated codes, e.g., turbo codes. The present invention provides a decoder for decoding encoded data, the decoder comprising: a processor having an input which receives probability estimates for a block of symbols, and which is arranged to calculates probability estimates for said symbols in a next iterative state; normalising means which normalises said next states estimates; a switch that receives both said normalised and said unnormalised next state estimates, the output of the switch being coupled to the input of the processor; wherein the switch is arranged to switch between the normalised and unnormalised next state estimates depending on the iterative state.

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Claude Berrou et al., “Near Shannon Limit Error—Correcting Coding and Decoding: Turbo-Codes (1),” In Proc. IEEE Int. Conf. Commun., Geneva, Switzerland, 1993, pp. 1064-1070.
L. R. Bahl et al., “Optimal Decoding of Linear Codes for Minimizing Symbol Error Rate”, IEEE Transactions on Information Therory, Mar. 1974, pp. 284-287.

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