The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2006
Filed:
Mar. 23, 2004
Yasunori Suzuki, Yokohama, JP;
Shinji Mizuta, Yokohama, JP;
Tetsuo Hirota, Kanazawa, JP;
Yasushi Yamao, Yokosuka, JP;
Yasunori Suzuki, Yokohama, JP;
Shinji Mizuta, Yokohama, JP;
Tetsuo Hirota, Kanazawa, JP;
Yasushi Yamao, Yokosuka, JP;
NTT BoCoMo, Inc., Tokyo, JP;
Abstract
A transmission signal and a pilot signal are predistorted by a digital predistorterby use of a power-series model, and the predistorted output is converted by a digital-analog converterto an analog signal. The analog signal is up converted by a frequency converterto an RF-band signal, which is transmitted after being power-amplified by a Doherty amplifier. The pilot signal is extracted by a pilot signal extractorfrom the output from the Doherty amplifier, and the extracted pilot signal is down converted by a frequency converterto a baseband signal. The baseband pilot signal is converted by an analog-digital converterto a digital pilot signal. A control partdetects an odd-order distortion component from the digital pilot signal, and based on the detected result, controls parameters of the digital predistorter.