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. 31, 2021
Filed:
Dec. 27, 2019
Keio University, Tokyo, JP;
School Judicial Person Ikutokugakuen, Atsugi, JP;
Kyowa Electronic Instruments Co., Ltd, Tokyo, JP;
Jin Mitsugi, Fujisawa, JP;
Haruhisa Ichikawa, Fujisawa, JP;
Yuusuke Kawakita, Atsugi, JP;
Kiyoshi Egawa, Tokyo, JP;
KEIO UNIVERSITY, Tokyo, JP;
SCHOOL JUDICIAL PERSON IKUTOKUGAKUEN, Kanagawa, JP;
KYOWA ELECTRONIC INSTRUMENTS CO., LTD, Tokyo, JP;
Abstract
A radio communication apparatus is described that includes a reception antenna, a converter, a calculator, and a separator. The reception antenna receives a mixed signal including two or more backscatter signals respectively transmitted from two or more tag devices and the converter converts the mixed signal into complex data on a complex plane. The calculator calculates phase angles of carrier waves of the two or more backscatter signals to approximate the phase angles into a complex data sequence of a predetermined length, and generates a projector matrix formed of a combination of the phase angles of carrier waves of the two or more backscatter signals. The separator separates the two or more backscatter signals from the mixed signal based on an inverse matrix of the projector matrix and the complex data sequence.