METHOD FOR ENCODING/DECODING INFORMATION IN DATA TRANSMISSION NETWORKS Russian patent published in 2007 - IPC H03M13/00 

FIELD: communications engineering, possible use in data transmission systems, primarily without check connection, to realize interference-resistant encoding and decoding of information with a cascade code.

SUBSTANCE: in the method at receiving side to original information block a cyclic checksum is added and resulting block is encoded using external Reed-Solomon code and then internal code. The encoded block is modulated and sent into channel. After demodulator received information block is decoded using internal code. The series of decoded and erased code words of internal code is memorized. If decoding of code word is impossible, the non-correctable code word is saved. Further, external code of Reed-Solomon series of decoded and erased code words of internal code is decoded, and cyclic checksum for aforementioned information series is computed and verified. On positive result of CRC check, information is given to receiver of messages. On negative result of check, erased words of internal code of series are restored. Restoration of code words of internal code and decoding of external code are repeated until CRC check returns a positive result.

EFFECT: increased trustworthiness of received message.

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