Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2007-01-30
2007-01-30
Pascal, Robert (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S052000
Reexamination Certificate
active
10730141
ABSTRACT:
A combined signal of a digital pilot signal and a digital transmission signal is applied to a digital predistorter (20), wherein it is added with odd-order distortions based on a power series model to generate a predistorted signal, then the predistorted signal is converted by a DA converter (31) to an analog signal, then the analog signal is upconverted by a frequency upconverting part (33) to a send frequency band, and the upconverted signal is output after being amplified by a power amplifier (37). A pilot signal component is extracted from the power amplifier output, then odd-order distortion components of the power series model are extracted by a digital predistorter control part (50) from the pilot signal component, and the odd-order distortions in the digital predistorter (20) are controlled to decrease the levels of the distortion components.
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Hirota Tetsuo
Mizuta Shinji
Suzuki Yasunori
Yamao Yasushi
Flanagan Krista
NTT DoCoMo Inc.
Pascal Robert
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