Pulse or digital communications – Repeaters – Testing
Patent
1989-10-24
1990-09-25
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
375120, 375 39, 329307, 329325, H04L 2706
Patent
active
049598449
ABSTRACT:
A digital demodulator (10) operates by multiplying an input signal with first and second orthogonal demodulation reference signals (Loa, LOb) to generate respective product signals, which are then integrated to generate first and second integrated values (a, b) indicative of digital data encoded in the input signal. These integrated values (a, b) are digitized to generate first and second digital values (a, b). A first error signal a-a) indicative of the difference between the first integrated value (a) and the first digital value (a) is generated, and the first error signal (a-a) is combined with the second digital value (b) to generate a first feedback signal. This first feedback signal is utilized to generate a control signal (ab-ba) indicative of phase difference between the input signal and the demodulation reference signals (LOa, LOb).
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AMP Incorporated
Olms Douglas W.
Smith David L.
Tesfaldet B.
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