Pulse or digital communications – Receivers – Automatic frequency control
Patent
1997-03-03
2000-05-02
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
455 121, 455427, H04L 2706
Patent
active
060581476
ABSTRACT:
A narrow band RF carrier acquisition method suitable for Demand Assigned Multiple Access (DAMA) networks having multiple narrow band carriers operating with channel frequency spacing that may be less than the frequency uncertainty on the link. The present invention uses a variable database of active narrow band carrier frequency assignments for the ground stations in the system, which, together with a knowledge of the approximate magnitude of the frequency errors, can be exploited to allow a receiving ground station to optimize the process of narrow band carrier frequency acquisition. The optimization employs alternative procedures depending upon different acquisition circumstances, thereby allowing the receiving ground station to utilize the optimal acquisition method under any given set of circumstances, where the circumstances are individual and changing for each ground station in the system but are known and communicated from a system database. The intelligent narrow band carrier acquisition method makes use of a modem design in which the modem functions are largely carried out by digital technology, with most operating parameters rapidly variable through software commands.
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Eklof Anders
Wolejsza, Jr. Chester Joseph
Chin Stephen
Ghayour Mohammad
Telogy Networks Inc.
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