Multiplex communications – Communication over free space – Repeater
Patent
1994-11-15
1997-08-19
Chin, Wellington
Multiplex communications
Communication over free space
Repeater
370350, 370508, 370519, 375268, 375298, 375362, H04J 400
Patent
active
056595450
ABSTRACT:
To obtain service from a satellite communication system, a mobile subscriber unit must acquire a TDMA communication channel. Because the satellites move with respect to the surface of the earth, propagation delays and Doppler shift affect the timing and frequency of received signals. A mobile subscriber unit synchronizes to the frequency and timing windows of a satellite communication station by receiving frequency and timing corrections during channel acquisition. The satellite initially estimates correction factors during initial acquisition requests and further estimates correction factors from synchronization bursts from the subscriber unit.
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Gregg Ralph C.
Olds Keith A.
Sowles Kenneth L.
Chin Wellington
Corrielus Jean B.
Gorrie Gregory J.
Motorola Inc.
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