Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1993-02-26
1995-09-05
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 541, 455 331, 455 531, 455 511, H04B 100
Patent
active
054487587
ABSTRACT:
Processing of dispatch calls in a simulcast multi-site communication system begins when a source communication unit transmits a message to one or more network receivers. The received signals are analyzed immediately at the received sites for signal quality. Each of the signals are time stamped to identify when they where received. The received signals are transported with their time stamp and signal quality metric to each of the other sites via a digital communication network connecting the sites. A master transmitter site determines the receiver source with the best quality signal as indicated by the signal quality metric. The master transmitter then transports the chosen best quality signal to each of the other sites via a digital communication network. Each transmitter site performs a transmit operation by storing the chosen best quality signal until it is time to transmit the signal in phase with all the other transmitter sites in a simulcast manner. The time stamp allows a time in the future to be chosen to accommodate the worst case expected transport delay through the digital network.
REFERENCES:
patent: 4317218 (1982-02-01), Perry
patent: 4850032 (1989-07-01), Freeburg
patent: 5220676 (1993-06-01), LoGalbo et al.
patent: 5255291 (1993-10-01), Holden et al.
Grube Gary W.
Ng Richard
Shaughnessy Mark L.
Coffing James A.
Eisenzopf Reinhard J.
Karim Nedra D.
Lukasik Susan L.
Motorola Inc.
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