Amplifiers – With pilot frequency control means
Reexamination Certificate
2006-05-09
2006-05-09
Pascal, Robert (Department: 2817)
Amplifiers
With pilot frequency control means
C330S12400D
Reexamination Certificate
active
07042283
ABSTRACT:
A transmission signal and a pilot signal are predistorted by a digital predistorter13by use of a power-series model, and the predistorted output is converted by a digital-analog converter14to an analog signal. The analog signal is up converted by a frequency converter15to an RF-band signal, which is transmitted after being power-amplified by a Doherty amplifier16. The pilot signal is extracted by a pilot signal extractor17from the output from the Doherty amplifier, and the extracted pilot signal is down converted by a frequency converter18to a baseband signal. The baseband pilot signal is converted by an analog-digital converter19to a digital pilot signal. A control part21detects an odd-order distortion component from the digital pilot signal, and based on the detected result, controls parameters of the digital predistorter.
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W. H. Doherty, “A New High Efficiency Power Amplifier for Modulated Waves”, Proceedings of the Institute of Radio Engineers, Technical Papers; vol. 24, No. 9, Sep. 1936, pp. 1163-1182.
Hirota Tetsuo
Mizuta Shinji
Suzuki Yasunori
Yamao Yasushi
Flanagan Krista M.
NTT BoCoMo, Inc.
Pascal Robert
LandOfFree
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