| 摘要 |
A method for synchronizing apparatus on the receiving side of a time multiplex or code multiplex transmisson system with apparatus on the transmitting side of the system, in particular in a system which operates in accordance with the SSMA technique, with which system the information is transmitted in a broad frequency band compared with the base band occupied by the information wherein a rapid frequency change modulated oscillation is transmitted by the transmitter at the beginning of transmission so that each frequency element is submitted to a digital phase modulation during transmission which is characteristic therefor in such a way that the frequency band which is occupied by this signal corresponds at least approximately to the frequency band which is occupied in a normal case of operation, whereby the carrier to be transmitted is phase shift keyed by a very rapidly clocked code with a long code period. The coding of the combined frequency and phase shift keyed signal transmitted prior to communication may contain fewer elements per code period, so code-phase-synchronization can be acquired more rapidly.
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