Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2008-07-14
2011-11-01
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S298000, C375S300000, C375S302000, C375S268000, C375S271000, C375S285000, C332S112000, C332S145000, C332S149000
Reexamination Certificate
active
08050352
ABSTRACT:
A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The pulse injector analyzes the PAM baseband signal for times when a predetermined threshold is exceeded and forms a pulse that is constructed and arranged to reduce the amplitude of the PAM baseband signal to a desired peak amplitude when the pulse is added to the PAM baseband signal. In other embodiments the peak-to-RMS amplitude ratio reducing methods and apparatus used to process PAM signal are adapted for reducing peak-to-RMS amplitude ratios of amplitude modulation signals in polar modulation transmitters. Peak-to-RMS amplitude ratio reduction is performed in the quadrature domain, the polar domain, or both the quadrature and polar domains.
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Booth Richard W. D.
Schell Stephan V.
Corrielus Jean B
Panasonic Corporation
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