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:
Sep. 06, 2011
Filed:
Apr. 01, 2008
Manabu Nakamura, Tokyo, JP;
Yasuhiro Takeda, Tokyo, JP;
Yoichi Okubo, Tokyo, JP;
Masaru Adachi, Tokyo, JP;
Naoki Hongo, Tokyo, JP;
Manabu Nakamura, Tokyo, JP;
Yasuhiro Takeda, Tokyo, JP;
Yoichi Okubo, Tokyo, JP;
Masaru Adachi, Tokyo, JP;
Naoki Hongo, Tokyo, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
The present invention provides a non-linear distortion detection method and a distortion compensation amplifying device capable of suppressing increase of the circuit size and the power consumption even if the signal band is widened. A signal obtained by feeding back an output of a power amplifier is sampled by an A/D converter. An equalizer of a distortion detection unit uses an input signal d(n) of a predistorter as a reference symbol to detect an equalization error e(n) of the orthogonal demodulation signal u(n). An absolute value averaging unit outputs an absolute value of the equalization error e(n) which has been temporally averaged to E(n) as a distortion value to a control unit. According to the distortion value, the control unit adaptively controls the predistorter to perform distortion compensation.