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:
Jul. 07, 2009
Filed:
Apr. 18, 2003
Akihiko Yoneya, Aichi, JP;
Akihiko Yoneya, Aichi, JP;
Nagoya Industrial Science Research Institute, Nagoya-shi, JP;
Abstract
According to an image signal cancel-type heterodyne reception method, I-phase and Q-phase intermediate-frequency signals can be modulated using two orthogonal signals, superimposed one on the other, amplified by one amplifier, and modulated using two modulated orthogonal signals, thereby amplifying I-phase and Q-phase signals by one amplifier. Therefore, it is possible to obtain a high image signal cancellation ratio with no difference in gain for both of the phases. According to a direct conversion orthogonal frequency division reception method, on the other hand, two-phase base-band signals can be amplified respectively by one amplifier to eliminate a difference in gain between amplifications of the two-phase base-bands, thereby realizing high non-interference between sub-carriers.