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:
Oct. 29, 2013
Filed:
Feb. 08, 2010
Kazuo Nagatani, Kawasaki, JP;
Yuichi Utsunomiya, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Shohei Ishikawa, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Yuichi Utsunomiya, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Shohei Ishikawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A distortion compensation apparatus includes a distortion compensation signal generation unit that performs, on a transmission signal, distortion compensation processing using a series operation; a coefficient updating unit that updates series operation coefficients used for the series operation based on a feedback signal of a power amplification output which is output through power amplification processing of a distortion compensation signal output from the distortion compensation signal generation unit, and based on the distortion compensation signal; a memory that stores the distortion compensation signal corresponding to a transmission signal having a given power value and the feedback signal of the power amplification output as restraint information; and a control unit that performs control so that, in accordance with the power value of the transmission signal, restraint information corresponding to a power value different from the power value of the transmission signal is read and used for updating the series operation coefficients.