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:
May. 25, 2021
Filed:
Mar. 28, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Hirofumi Sasaki, Musashino, JP;
Doohwan Lee, Musashino, JP;
Hiroyuki Fukumoto, Musashino, JP;
Hiroyuki Shiba, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An OAM multiplexing communication system multiplexes signals of one or more sequences for each OAM mode. A transmitting station includes a transmitting antenna using an M-UCA, and an OAM mode generation unit that simultaneously generates one or more OAM modes from each UCA. A receiving station includes a receiving antenna equivalent to the M-UCA, an OAM mode separation unit that separates signals received by each UCA for each OAM mode, and a channel estimation/interference compensation unit that compensates for inter-mode interference between the OAM modes by using a weight. The channel estimation/interference compensation unit selects, for each OAM mode, signals of a subject mode and an adjacent mode from among the signals of the OAM modes separated by the OAM mode separation unit, and compensates for the inter-mode interference by multiplying an approximate weight calculated by using channel matrixes of the subject mode and the adjacent mode.