FIELD: electrical communications; decoding noise-immune concatenated code in digital information transmission systems.
SUBSTANCE: proposed method includes formation of either short or long concatenated code on transmitting end which is decoded on receiving end starting from decoding internal code of long concatenation and determination of s number of internal code words in concatenation received in place of internal code words of concatenation which are not transmitted for short concatenated code. If s exceeds threshold value s1, decision is taken to receive long concatenated code, in which case external code of long concatenation is decoded. Otherwise, if s does not exceed threshold value s1, decision is taken to receive short concatenated code, and external code of short concatenation is decoded. Then number s2 of internal-code words of concatenation received in place of internal-code words of concatenation is determined using results of decoding internal code of concatenation which are transferred both for long concatenated code and for short one; communication channel quality is estimated, and threshold value s1 is varied depending on communication channel quality. Communication channel quality is estimated in this case by mean probability of receiving internal-code words of concatenation.
EFFECT: enhanced noise immunity.
1 cl
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Authors
Dates
2006-07-20—Published
2005-02-15—Filed