Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2007-03-27
2007-03-27
Burd, Kevin (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S297000
Reexamination Certificate
active
10153446
ABSTRACT:
Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the present invention is implemented in combination with the (frequency-independent) magnitude and phase pre-distortion technique described in U.S. patent application Ser. No. 09/395,490 (“the '490 application”), where the frequency-dependent pre-distortion corresponds to amplifier distortion that has a magnitude that is proportional to the frequency offset from the carrier frequency and a phase shift of ±90° on either side of the carrier frequency. Since these characteristics match those of a differentiator, a thorough correction of this part of the amplifier's distortion can be achieved using a differentiating filter. Embodiments of the present invention may be implemented in the baseband domain. Implementations may also be based on look-up tables that are adaptively updated to ensure optimal performance over time.
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Aghdam Freshteh N
Andrew Corporation
Burd Kevin
Mendelsohn Steve
LandOfFree
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