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:
Jan. 30, 2007
Filed:
Jan. 31, 2005
Yasunori Suzuki, Yokohama, JP;
Shoichi Narahashi, Yokohama, JP;
Shinji Mizuta, Yokohama, JP;
Yasushi Yamao, Yokosuka, JP;
Yasunori Suzuki, Yokohama, JP;
Shoichi Narahashi, Yokohama, JP;
Shinji Mizuta, Yokohama, JP;
Yasushi Yamao, Yokosuka, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A transmission signal containing signals of a plurality of frequency bands is divided and fed to a linear signal transfer path including a delay circuit and a plurality of distortion generation paths for the plurality of frequency bands. In each distortion generation path, the signal of the corresponding frequency band is extracted by a band signal extractor from the signal fed to the path, an odd-order distortion of the extracted signal is generated by an odd-order distortion generator, and the phase and amplitude of the odd-order distortion are adjusted by a vector adjuster to provide the output signal of the distortion generation path. The output signals from such plurality of distortion generation paths are combined by a combiner with the output from the linear signal transfer path to provide the combined output as the output from a multi-band predistorter using power series representation.