Pulse or digital communications – Repeaters – Testing
Patent
1995-12-06
1998-08-25
Bocure, Tesfaldet
Pulse or digital communications
Repeaters
Testing
375344, 375367, 375355, 370514, H04B 1500, H04K 100, H04L 2730
Patent
active
057990344
ABSTRACT:
A frequency acquisition and compensation device and method for direct sequence spread spectrum communications systems has an identification (ID) sequence in an acquisition frame which is received by a receiving station and an ID sequence stored in an ID register. A received acquisition frame is demodulated using dot product and cross product demodulation. An ID detector detects the ID sequence in the demodulated dot product, cross product, or inverse cross product acquisition frame. When the ID is detected by the dot product demodulator, the receive frame timing is adjusted to coincide with a time interval when the ID was detected. Also, when the ID sequence stored in the ID register matches either the dot product, cross product or inverted cross product of the received ID sequence, the system microcontroller updates the automatic frequency control value.
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Vo Quang D.
Walley John S.
Bocure Tesfaldet
Cray William C.
O'Shaughnessy James P.
Rockwell International Corporation
Webster Bryan
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