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. 22, 2014
Filed:
Nov. 19, 2010
Takashi Maehata, Osaka, JP;
Mikhail Illarionov, Osaka, JP;
Takashi Maehata, Osaka, JP;
Mikhail Illarionov, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An object of the present invention is to appropriately limit an amplitude of an IQ baseband signal having different average powers for respective frequency bands Band B, without degrading an SNR. The present invention relates to a signal processing circuitfor reducing a PAPR of a modulated wave signal to be inputted to a power amplification circuit. The signal processing circuitincludes a power calculation sectionthat calculates an instantaneous power P of an IQ baseband signal of the modulated wave signal, and a signal processing sectionthat limits an amplitude of the IQ baseband signal by performing a clipping process or the like, by using cancellation signals Ic and Qc capable of canceling the IQ baseband signal in accordance with average powers of the respective frequency bands Band B, such that an upper limit of an instantaneous power P becomes equivalent to a predetermined threshold Pth.