Method and circuit for the synchronization of receiving devices in a digital multiplex communication system.

In digital Muitiplex transmission system, in particular in a digital radio transmission system, a plurality of message transmission channels in the time, code or frequency division multiplexing is operated. When applying the code division or frequency division multiplexing method, the separation of the individual message transmission channels is performed using different sets of data symbols. The transmitted to the individual message transmission channels of the multiplex transmission system messages, in particular the symbols (data and synch symbols) are synchronously transmitted to each other. At the beginning of each frame and subframe (with a time division multiplex transmission system) which Synchronisterinformation is sent to the frame beginning and the length of the message is equal to the time between two Synchronisiersymbolen. Particularly in a digital radio transmission system, a safe synchronization of the receiving devices is due to the multipath propagation, the precondition for the evaluation of the message content in the mobile radio station. In order for the broadband transmission the Empfangseinrich- tTo synchronize ments sure synchronizing symbols are displayed between the data symbols at defined intervals, which are transmitted simultaneously in multiple communication channels and are equal to each other. Thus, the synch with much higher energy is received as the data symbols, the multipath profile can be measured and allows a secure synchronization.