FIELD: discrete information transmission systems.
SUBSTANCE: code frame synchronization method for a concatenated code is proposed when applying hard and soft decisions, in which corrective concatenated codes are used. The input sequence consists of several consecutive words, each of which is a bitwise modulo-two sum of an error-correcting cyclic code, a numbering sequence, and a phasing sequence. At the end of each numbering sequence, the value of its match counter is compared with all match counters of the remaining numbering sequences. If, at the end of the numbering sequence, the value of its match counter exceeds or becomes equal to the threshold value and exceeds the value of any match counter of the remaining numbering sequences, then a decision is made on code framing of the input sequence.
EFFECT: increased reliability of received information by increasing the probability of correct synchronization of the unit, while ensuring a high information transfer rate and a simple circuit implementation.
1 cl, 1 dwg, 3 tbl
