Pulse or digital communications – Transmitters – Amplitude modulation
Reexamination Certificate
2007-05-29
2007-05-29
Corrielus, Jean B. (Department: 2611)
Pulse or digital communications
Transmitters
Amplitude modulation
Reexamination Certificate
active
10433527
ABSTRACT:
A method for reducing out-of-band and spurious emissions of AM transmitters in digital operation includes providing an amplitude signal and an RF-P signal from a digital modulation signal. The RF-P signal is tapped in the RF branch and the tapped signal is passed through a Gaussian filter in a separate branch, the Gaussian filter having a linear phase. The filtered RF-P signal is fed to an envelope detector to detect amplitude variations. The detected amplitude variations are combined as a correction signal with the amplitude signal in a multiplier in the A branch to produce a corrected amplitude signal. The corrected amplitude signal is fed to the linear input of the transmitter output stage and multiplied by the RF-P signal.
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Bolourchi Nader
Corrielus Jean B.
Darby & Darby
Deutsche Telekom AG
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