Pulse or digital communications – Repeaters – Testing
Patent
1993-10-26
1996-01-02
Gregory, Bernarr E.
Pulse or digital communications
Repeaters
Testing
375200, 375206, 380 18, 380 30, 380 34, 380 49, 455 674, H04J 1302, H04J 1304, H04B 169, H04B 1707
Patent
active
054815614
ABSTRACT:
A network of personal communications terminals communicating in a CDMA mode includes a reference station for transmitting a pilot tone that is pre-corrected at the reference station and is used at the remaining stations for frequency control, transmit power control and antenna acquisition and tracking. Voice activation is employed to permit the CDMA system to share the satellite transponder power and bandwidth in a fully Demand-Assignment-Multiple-Accessing (DAMA) manner. Burst-mode operation of a voice activated CDMA system is permitted by sending dummy data in the speech pausing period at a reduced (but not zero) power level, and the "near-far" problem inherent in a CDMA system is mitigated by the use of uplink power control.
REFERENCES:
patent: 4140973 (1979-02-01), Stevens
patent: 4630283 (1986-12-01), Schiff
patent: 4637064 (1987-01-01), Roberts et al.
patent: 4962507 (1990-10-01), Renshaw
patent: 5093923 (1992-03-01), Leslie
patent: 5109390 (1992-04-01), Gilhousen et al.
Supplementary European Search Report EP 92 91 3830, Communication Dated 26 Jan. 1994.
Comsat Corporation
Gregory Bernarr E.
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