Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2003-04-16
2009-08-04
Payne, David C (Department: 2611)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C330S010000, C332S149000, C375S261000, C375S297000, C375S300000, C455S108000, C455S114300
Reexamination Certificate
active
07570711
ABSTRACT:
A quadrature LINC transmission system processes a baseband input signal for transmission as a linearly amplified RF signal. An in-phase LINC element processes an in-phase baseband signal into an in-phase RF signal. A quadrature LINC element processes a quadrature baseband signal into a quadrature RF signal. An output combiner combines the in-phase RF signal with the quadrature RF signal to provide the linearly amplified RF signal. The in-phase LINC element has a constant envelope decomposition block for decomposing the in-phase baseband signal into in-phase baseband constant envelope components. Two up-converters convert the in-phase baseband constant envelope components to in-phase RF constant envelope components. Two non-linear amplifiers amplify the in-phase RF constant envelope components. A combiner combines the amplified in-phase RF constant envelope components to yield the in-phase RF signal. The quadrature LINC element is similar to the in-phase LINC element and provides the quadrature RF signal.
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Chavez Carlos J.
Frank Gunther B.
Hoffman Dennis L.
Barbieri Daniel M.
Dsouza Adolf
Payne David C
Rockwell Collins, Inc.
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