Telecommunications – Carrier wave repeater or relay system – Two separate way transmission
Patent
1991-06-28
1993-08-24
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Two separate way transmission
455 512, 455 571, 455 70, H04B 714
Patent
active
052396720
ABSTRACT:
A method of synchronizing a plurality of remote site transmitters (200) in a digital simulcast transmission system is described that enables use of four-level modulation on two-level modulation systems. A synchronization signal is transmitted at a predetermined data rate from a prime site, which signal might include a synchronization pattern having a first and a second portion. The first portion of the synchronization pattern is used for synchronization, while the second portion indicates the completion of the first portion. The method includes detecting (205, 320) of the first portion of the synchronization pattern. Each remote site transmitter (200) further has a modulation clock having a phase polarity which is selected (215, 324) in response to the detection of the first portion of the synchronization signal.
REFERENCES:
patent: 4231114 (1980-10-01), Dolikian
patent: 4369443 (1983-01-01), Giallanza et al.
patent: 5060240 (1991-10-01), Erickson et al.
patent: 5117424 (1992-05-01), Cohen et al.
patent: 5128971 (1992-07-01), Johnson
Kurby Christopher N.
Martinovich Krsman
Monson John P.
Wiatrowski David G.
Coffing James A.
Eisenzopf Reinhard J.
Keough Timothy H.
Krause Joseph P.
Motorola Inc.
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