Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1987-01-09
1989-02-14
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455137, 455276, H04B 1702
Patent
active
048052299
ABSTRACT:
Diversity combiners for use in satellite and other communication systems. Such combiners are able to accommodate fast and dramatic signal fades and doppler shifts inherent in satellite communications by employing differential and common mode automatic phase control and differential and common mode signal weighting techniques. Phase control takes place in these combiners after signal weighting to decrease differential loop phase detector gradients and noise bandwidth as a function of signal-to-noise imbalance of the channels. An acquisition circuit is provided to deactivate the differential phase control loop when either signal falls below a predetermined level. During times when the faded signal reemerges, the combiner establishes optimal combining with minimum phase discontinuities on the output or phase lock reacquisition disturbances.
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1978 Conference on Communications Equipment, 4/78, De Susans, Fig. 2.
Griffin Robert L.
Kuntz Curtis
Scientific-Atlanta, Inc.
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