METHOD OF SYNCHRONIZATION IN A DATA TRANSMISSION SYSTEM USING A LINEAR BLOCK CODE

摘要

PHD 83308 12ABSTRACT:In a data transmission system data, more spec-ifically messages can be transmitted in the form ofsequentially linked modified code words of a linear blockcode. The modified code words are obtained by combiningthe code words formed from the data with a protection word.When modified code words are interleaved bit-wise thesequence of code words of a message can be changed afterde-interleaving at the receiver end, by bit shift. So asto make it possible to recognize faulty synchronization,each code word is linked to a protection word which char-acterized its position within the message. The modifiedcode words thus obtained are interleaved bit-wise, trans-mitted and de-interleaved again and each word thus obtainedis combined at the receiver end with a check word charac-terizing its position within the message. The protectionwords and the check words are chosen such, that the keywords obtained by combining the protection words and thecheck words are preferably located in sub-classes which arenot used for decoding.