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. 28, 2013
Filed:
Jun. 29, 2007
Hiroyoshi Ishikawa, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Hiroyoshi Ishikawa, Kawasaki, JP;
Nobukazu Fudaba, Kawasaki, JP;
Kazuo Nagatani, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A DC offset component that occurs in a quadrature modulation system, and that is contained in a modulated transmit signal, is compensated for with good accuracy. In a DC offset compensation method according to the present invention, a DC offset correction value obtained from the transmit signal is weighted in accordance with the signal level of an input signal which is transmit data input to the quadrature modulation system, and the DC offset component contained in the transmit signal is compensated for by using the thus weighted DC offset correction value.