Pulse or digital communications – Repeaters – Testing
Patent
1985-06-17
1987-12-08
Behrend, Harvey E.
Pulse or digital communications
Repeaters
Testing
375 97, H03D 124
Patent
active
047122226
ABSTRACT:
This invention provides improved performance and reduced cost relative to conventional carrier phase tracking systems. The invention improves the performance of the communication system by rapidly acquiring and reliably tracking the carrier signal with substantially digital hardware. The invention has no reverse slope null characteristic and therefore does not suffer from hangup. As such, acquisition time is independent of phase error. These solutions are provided without the added expense and calibration problems of a crystal filter or the performance compromise of the dual phase detector phase locked loop.
The invention includes circuitry which removes the carrier from the received data signal and converts the signal to a complex baseband signal. The baseband signal is subsequently sampled to provide a plurality of complex samples. The phase of each sample is extracted and compared to the phase of an adjacent sample to provide phase difference signals. The phase difference signals are then applied to phase shifting circuitry which substantially compensates for the phase offset in the received data signal.
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Harry L. Van Trees, "Detection Estimation and Modulation Theory", John Wiley and Sons, New York, 1968, pp. 335-349.
Heard Charles M.
Yang Frank C.
Behrend Harvey E.
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
Mitchell S. M.
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