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:
Aug. 06, 2019
Filed:
Jun. 21, 2017
Ntt Electronics Corporation, Yokohama-shi, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Yasuharu Onuma, Kanagawa, JP;
Etsushi Yamazaki, Kanagawa, JP;
Hiroyuki Nouchi, Kanagawa, JP;
Tomohiro Takamuku, Kanagawa, JP;
Katsuichi Oyama, Kanagawa, JP;
Kazuhito Takei, Kanagawa, JP;
Masanori Nakamura, Kanagawa, JP;
Mitsuteru Yoshida, Kanagawa, JP;
Masahito Tomizawa, Kanagawa, JP;
NTT ELECTRONICS CORPORATION, Yokohama-shi, Kanagawa, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An I component compensation unit calculates an I component in which a distortion has been compensated, by forming a first polynomial expressing the distortion of the I component based on an I component and a Q component of a quadrature modulation signal and multiplying each term of the first polynomial by a first coefficient. A Q component compensation unit calculates a Q component in which a distortion has been compensated, by forming a second polynomial expressing the distortion of the Q component based on the I component and the Q component of the quadrature modulation signal and multiplying each term of the second polynomial by a second coefficient. A coefficient calculation unit calculates the first and second coefficients by comparing outputs of the I component compensation unit and the Q component compensation unit and a known signal.