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. 03, 2012
Filed:
Feb. 26, 2007
Takashi Okada, Kodaira, JP;
Takahiro Todate, Kodaira, JP;
Yasuhiro Takeuchi, Kodaira, JP;
Takashi Okazaki, Kodaira, JP;
Masaharu Chiba, Kodaira, JP;
Takashi Okada, Kodaira, JP;
Takahiro Todate, Kodaira, JP;
Yasuhiro Takeuchi, Kodaira, JP;
Takashi Okazaki, Kodaira, JP;
Masaharu Chiba, Kodaira, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
A carrier leak compensating device () for adding compensation values to a received transmission signal, an analog quadrature modulator (), a feedback device (-) for receiving and quadrature-detecting part of an output signal of the analog quadrature modulator and outputting a feedback signal in which the frequency of each carrier signal is the same as in the transmission signal, a carrier leak detecting device () for detecting an I-phase carrier leak and a Q-phase carrier leak on the basis of the difference between cumulative addition values of an amplitude/phase-adjusted feedback signal and the transmission signal, and a carrier leak compensation value controller () for updating the compensation values on the basis of the detected carrier leak. The number of samples for the amplitude/phase detection may be smaller than the number of cumulative addition samples.