Subscriber frequency control system and method in point-to-multipoint RF communication system
US5794119A · kind A · utility
99Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1995 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Nov 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/44
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.