Telecommunications – Transmitter and receiver at separate stations
Patent
1989-02-13
1989-10-24
Safourek, Benedict V.
Telecommunications
Transmitter and receiver at separate stations
375114, 379 59, 379 63, 455 51, H04Q 704
Patent
active
048767409
ABSTRACT:
A cellular radiotelephone system is disclosed in which the signalling protocol for the system is embedded in the frame synchronization of the digital messages transmitted on the system. Multiple functions are accomplished by the synchronization signal and include call supervision, mode definition, and data frame synchronization. The synchronization signal is a high auto correlation, low cross correlation sequence of a predetermined number of data bits. Different bit sequences may be employed as a synchronization signal while conveying call supervision information defining the serving fixed site. Additionally, the logical inverse of the synchronizing signal may be utilized interchangably with the synchronizing signal to define the fixed site. A repetitive pattern of synchronizing signals and logical inverse synchronizing signals convey system mode information without increasing signalling overhead or losing the correlation performance of the full synchronization word.
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Leitich Albert J.
Levine Stephen N.
Hackbart Rolland R.
Jenski Raymond A.
Motorola Inc.
Safourek Benedict V.
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