Method for selecting a highest quality signal for retransmission

Details Method for selecting a highest quality signal for retransmission Method for selecting a highest quality signal for retransmission

1995-05-15

1996-07-30

Pham, Chi H.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 561, 375356, H04B 726

Patent

active

055421199

ABSTRACT:
Processing of dispatch calls in a simulcast multisite communication system (100) 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 (508). Each of the signals are time stamped (510) to identify when they were received. The signal quality is then compared to the signal quality of previously transmitted highest quality signals (514). If the signal quality is of higher quality than previously transmitted highest quality signals (516), 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 (522). Each site now performs a transmit operation by first determining the receiver source with the highest quality signal as indicated by the signal quality metric (606). The determined highest quality signal is stored 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: 4941200 (1990-07-01), Leslie et al.
patent: 4972410 (1990-11-01), Cohen et al.
patent: 5287550 (1994-02-01), Fennell et al.

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