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:
Feb. 05, 2013
Filed:
Dec. 26, 2006
Yoshito Shimizu, Kanagawa, JP;
Akihiko Matsuoka, Kanagawa, JP;
Tomoya Urushihara, Chiba, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An object of the invention is to provide a multimode polar modulation device and a multimode radio communication method for making it possible to decrease the distortion compensation processing data capacity while maintaining the distortion compensation accuracy and also making it possible to efficiently store the distortion compensation processing data corresponding to a multimode modulation signal adaptively acquired in memory. At the distortion compensation coefficient calibration operation time of a polar modulation circuit, a control sectionselects a modulation signal with a narrower dynamic range of amplitude signal than at the transmission operation time, an adaptive operation control sectionmeasures a spectrum in output of a power amplifierfor each predetermined output level, and a distortion compensation processing circuitfinds optimum coefficient information. On the other hand, at the transmission operation time, the optimum coefficient information found according to the above-mentioned procedure is referenced and the optimum coefficient information of a modulation signal with a wide dynamic range of amplitude signal is found.