Multiplex communications – Communication over free space – Repeater
Patent
1996-04-30
1999-06-08
Jung, Min
Multiplex communications
Communication over free space
Repeater
370331, 370350, 370509, 370516, H04J 306
Patent
active
059109459
ABSTRACT:
A method and apparatus are provided, for maintaining synchronous return and forward communications links between user terminals and earth stations communicating via a common satellite in a satellite based telecommunications system. Each user terminal maintains a closed synchronization loop with its associated earth station based on timing and frequency error offset signals received by the user terminals. The user terminals update their internal timing and frequency generators based on the received error offset signals. In an earth station sharing embodiment, one of the earth stations is designated as a master earth station while the remaining stations are designated as slave earth stations with respect to a common satellite. The slave earth stations monitor a return link between at least one user terminal and the master earth station. The slave earth stations update their internal reference timing and frequency signal generators, in order to remain synchronous with the return link between the monitored user terminal and the master earth station. The slave earth stations maintained synchronous forward links by requesting synchronization update information from the monitored user terminal. Upon receiving a request, the monitored user terminal calculates a difference in timing and frequency between frames received from the requesting slave and associated master earth stations. The user terminal transmits the difference in timing and frequency along its return link.
REFERENCES:
patent: 5625640 (1997-04-01), Palmer et al.
patent: 5638361 (1997-06-01), Ohlson et al.
patent: 5659545 (1997-08-01), Sowles et al.
patent: 5661724 (1997-08-01), Chennakeshu et al.
patent: 5664006 (1997-09-01), Monte et al.
Garrison Arthur L.
Smigla Terrence R.
Stephens Scott A.
Jung Min
TRW Inc.
Yatsko Michael S.
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