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. 18, 2014
Filed:
Jul. 05, 2010
Satoshi Tsukamoto, Osaka, JP;
Noriaki Saito, Tokyo, JP;
Yoshito Shimizu, Kanagawa, JP;
Tadashi Morita, Kanagawa, JP;
Katsuaki Abe, Kanagawa, JP;
Satoshi Tsukamoto, Osaka, JP;
Noriaki Saito, Tokyo, JP;
Yoshito Shimizu, Kanagawa, JP;
Tadashi Morita, Kanagawa, JP;
Katsuaki Abe, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Disclosed are a nonlinear distortion compensating receiver and nonlinear distortion compensation method, wherein nonlinear distortion is reduced with a simple circuit configuration. A correction (opposite characteristics) filter () has characteristics opposite that of the frequency characteristics of a direct sampling mixer () and corrects signals sampled by the direct sampling mixer (). In the main path, a LPF () extracts a frequency band component of a desired signal from the corrected signal. In the replica path, a BPF () extracts the frequency band component of a blocker signal from the corrected signal. A cubing circuit () uses the frequency band component of the blocker signal to generate a replica signal for the nonlinear distortion. An adaptive filter () performs filter processing on the replica signal while updating the filter coefficients. A subtractor () subtracts the output signal of the adaptive filter () from the frequency band component of the extracted desired signal and outputs the subtraction result as the desired signal.