US 11,811,143 B2
Oam multiplexing communication system and inter-mode interference elimination method
Hirofumi Sasaki, Yokosuka (JP); Doohwan Lee, Yokosuka (JP); Hiroyuki Fukumoto, Yokosuka (JP); and Hiroyuki Shiba, Yokosuka (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/043,133
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Mar. 28, 2019, PCT No. PCT/JP2019/013895
§ 371(c)(1), (2) Date Sep. 29, 2020,
PCT Pub. No. WO2019/189705, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-069138 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0021053 A1, Jan. 21, 2021
Int. Cl. H01Q 21/20 (2006.01); H04B 7/0456 (2017.01); H04L 27/36 (2006.01); H04J 99/00 (2009.01)
CPC H01Q 21/20 (2013.01) [H04B 7/0456 (2013.01); H04J 99/00 (2022.08); H04L 27/366 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An OAM multiplexing communication system that uses one or more orbital angular momentum (OAM) modes and multiplexes signals of one or more sequences for each OAM mode, the OAM multiplexing communication system comprising:
a transmitting station including:
a transmitting antenna that uses an M-UCA in which a plurality of uniform circular arrays (UCAs) having different diameters are concentrically disposed, each UCA having a plurality of antenna elements disposed circularly at an equal interval; and
an OAM mode generation unit that simultaneously generates the one or more OAM modes from each UCA of the transmitting antenna; and
a receiving station including:
a receiving antenna that has a configuration equivalent to the M-UCA;
an OAM mode separation unit that separates signals received by each UCA of the receiving antenna for each OAM mode; and
a received signal processing unit that estimates channel information for each OAM mode separated from the signals received by the each UCA of the receiving antenna, and performs an equalization process for each OAM mode by using a receiving weight calculated from the channel information, wherein
the received signal processing unit is configured to estimate, for each OAM mode, channel information of another OAM mode causing interference and calculate the receiving weight of a subject OAM mode by using the channel information of the subject OAM mode and said another OAM mode.