Pulse or digital communications – Receivers – Angle modulation
Patent
1998-01-30
2000-11-14
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375325, 375327, 455260, 455265, 4551803, 331 17, 331 25, 331 34, H04L 27227
Patent
active
061480398
ABSTRACT:
The present invention relates to an improved demodulator for locking onto and tracking a carrier. Harmonic frequencies are occasionally generated by demodulation circuitry. When this occurs, the harmonic frequencies can interfere with the demodulator's locking and tracking functions, especially if the harmonic frequencies are near a down converted carrier's frequency. A system and method are disclosed which provides an offset to a frequency synthesizer whose output frequency is used to down convert the carrier. The offset alters the frequency of the down converted carrier so as to shift it away from the interfering harmonics. In this regard, the demodulator is enabled to lock onto and track a carrier when previously not possible.
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Coman Ion
Hanna Kenneth M.
Barnhardt Hubert J.
Chin Stephen
Gardner Kelly A.
Massaroni Kenneth M.
Rupert Paul N
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