Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-10-12
1992-07-14
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
455133, 455 54, H04B 710, H04L 102
Patent
active
051310104
ABSTRACT:
A Voice Guard digital voter system for a multi-site public service trunking (PST) digitally trunked RF communications system operates on the principle that it is highly likely that messages received during a system redundancy removal period are redundant messages. For a given RF channel, digital receiver is associated with each of multiple sites and receives digital messages reported to it by its associated sites. The multiple digital receivers are connected to a digital selector via a service request line (FSL) and a serial data line (BSL). Digital receivers calculate a bit error rate code (BERC) for each message they receive. All digital receivers receiving a version of a message are synchronized by the digital selector in response to a request to transmit by one of the digital receivers. The digital receivers wait a delay time corresponding to the BERC they calculates and also responsive to a fixed slot assignment associated with each digital receiver. The digital receiver having the lowest calculated BERC begins first to transmit its message to the selector--and all other receivers abort transmitting. Bus contentions between digital receivers calculating the same BERC by introducing the additional delay time corresponding to digital receiver fixed slot assignment.
REFERENCES:
patent: 3701109 (1972-10-01), Peters
patent: 4013962 (1977-03-01), Beseke et al.
patent: 4128809 (1978-12-01), Kage
patent: 4232294 (1980-11-01), Burke et al.
patent: 4317218 (1982-02-01), Perry
patent: 4395710 (1983-07-01), Einolf, Jr. et al.
patent: 4530087 (1985-07-01), Yamamoto
patent: 4583089 (1986-04-01), Cope
patent: 4593282 (1986-06-01), Acampora et al.
patent: 4623886 (1986-11-01), Livingston
patent: 4638311 (1987-01-01), Gerety
patent: 4642630 (1987-02-01), Beckner et al.
patent: 4644348 (1987-02-01), Gerety
patent: 4652873 (1987-03-01), Dolsen et al.
patent: 4677612 (1987-06-01), Olson et al.
patent: 4682324 (1987-07-01), Ulug
patent: 4707693 (1987-11-01), Hessel
patent: 4905302 (1990-02-01), Childress et al.
Derrenge Charles L.
Tucker Marcella M.
Bocure Tesfaldet
General Electric Company
Safourek Benedict V.
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