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:
Dec. 29, 2009
Filed:
Sep. 22, 2004
Hiroyoshi Ishikawa, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Toru Maniwa, Kawasaki, JP;
Hiroyuki Hayashi, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Toru Maniwa, Kawasaki, JP;
Hiroyuki Hayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A distortion compensating apparatus calculates a distortion compensation coefficient in such a manner that a difference signal between a reference signal, which is a transmit signal, and a feedback signal will be diminished, updates an old distortion compensation coefficient by the calculated distortion compensation coefficient and applies distortion compensation to the transmit signal based upon this distortion compensation coefficient. In this apparatus, a phase correcting interval, which is for correcting the phase difference between the reference signal and the feedback signal, and a distortion compensation coefficient updating interval are generated alternately, a correction is applied so as to null the phase difference in the phase correcting interval, and the distortion compensation coefficient is updated in the distortion compensation coefficient updating interval.