Subscriber frequency control system and method in point-to-multi

Details Subscriber frequency control system and method in point-to-multi Subscriber frequency control system and method in point-to-multi

1995-11-21

1998-08-11

Grant, Chris

Telecommunications

Interference signal transmission

455 71, 455 76, 348 11, H04B 100, H04N 7173

Patent

active

057941190

ABSTRACT:
A frequency control system and method for minimizing frequency drifts in subscriber terminals in a point-to-multipoint system is described enabling the use of low cost oscillators in the Subscriber terminals by measuring the frequency offset of the subscriber terminal's receiver to estimate its oscillator frequency drift which is then used to correct the subscriber terminal's transmitter frequency and also by feedback of a frequency correction from the base station to the subscriber.

REFERENCES:
patent: 4489413 (1984-12-01), Richmond et al.
patent: 4932070 (1990-06-01), Waters et al.
patent: 5134707 (1992-07-01), Sakashita et al.
patent: 5230088 (1993-07-01), Kramer, Jr. et al.
patent: 5249305 (1993-09-01), Wieczorek
patent: 5280644 (1994-01-01), Vannatta et al.
patent: 5542095 (1996-07-01), Petranovich

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