METHOD FOR SOFT-DECISION DECODING OF NOISE-IMMUNE CODE Russian patent published in 2015 - IPC H03M13/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used for soft-decision decoding of a noise-immune code in systems for transmitting digital messages over communication channels with high level of interference. Depending on the reliability of symbols of the noise-immune code, the method includes estimating the signal-to-noise ratio in the communication channel, using the signal-to-noise ratio to determine communication channel quality, calculating block probability distribution of the number of errors in the noise-immune code and determining the maximum number of errors in the noise-immune code to be corrected and using the number of errors to estimate the value s of the least reliable symbols of the noise-immune code. The method further includes generating 2^s versions of the noise-immune code, performing hard-decision decoding of all 2^s versions of the noise-immune code and correcting errors in each of said versions, comparing each of the 2^s versions of the decoded noise-immune code on Hamming distance with the received noise-immune code and obtaining a set of 2^s Hamming distances and obtaining, at the output of a decoder, the information part of the decoded noise-immune code which corresponds to the minimum Hamming code distance from the set of 2^s Hamming distances.

EFFECT: high noise-immunity of reception.

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