Telecommunications – Carrier wave repeater or relay system – Monitoring
Patent
1989-01-10
1991-05-28
Kuntz, Curtis
Telecommunications
Carrier wave repeater or relay system
Monitoring
455 12, 455 21, 455 51, H04B 714
Patent
active
050201310
ABSTRACT:
In a satellite communications system, satellite channels are divided into groups of successively adjacent channels which are covered by a range of frequency drifts caused by a satellite transponder and the channels of each group are assigned unique words of different bit patterns. Modulation systems of an earth station are associated respectively with demodulation systems of distant earth station via the respective satellite channels. A unique word is transmitted from each modulation system together with an information signal and received by an associated demodulation system of the distant earth station. A variable frequency carrier is synthesized in the demodulation system to demodulate the received signal to recover the information signal and the unique word. The recovered unique word is used to establish the frame start timing and the variable frequency carrier is controlled in response to the unique word to tune in the demodulation system to the desired satellite channel.
REFERENCES:
patent: 4876737 (1989-10-01), Woodworth et al.
Kuntz Curtis
NEC Corporation
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