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Title:
INTERFERENCE CANCELING IN HAPS MULTI-FEEDER LINK
Document Type and Number:
WIPO Patent Application WO/2020/179384
Kind Code:
A1
Abstract:
The purpose of the present invention is to dynamically suppress same-frequency interference in a multi-feeder link between multiple gateway (GW) stations and an aerial floating-type communication relay device. Each of the multiple GW stations transmits multiple pilot signals in mutually different frequencies in the feeder link. A relay communication station of the communication relay device calculates, on the basis of the reception results of the pilot signals received from each of the GW stations, the path differences between each of the GW stations and a feeder link antenna of the communication relay device to estimate the propagation path responses; calculates, on the basis of the propagation path responses, a weight for suppressing the interference signal of interference which occurs when the transmission signal transmitted from a GW station is received by directed beams corresponding to the other, remaining GW stations; and subtracts, from the received signal received with the directional beam corresponding to the GW station, the result of multiplying the received signal received by the directional beams corresponding to the other GW stations by the weight corresponding to the other GW stations.

Inventors:
FUJII TAKAFUMI (JP)
FUJII TERUYA (JP)
Application Number:
PCT/JP2020/005323
Publication Date:
September 10, 2020
Filing Date:
February 12, 2020
Export Citation:
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Assignee:
HAPSMOBILE INC (JP)
International Classes:
H04W16/26; H04B7/024; H04B7/0413; H04B7/06; H04B7/185; H04W16/28; H04W84/06
Domestic Patent References:
WO2018207612A12018-11-15
Foreign References:
US20160046387A12016-02-18
US9798329B22017-10-24
US20170126309A12017-05-04
US20160046387A12016-02-18
Other References:
KAZUKI MARUTA, CHANG-JUN AHN: "Interference suppression schemes for pilot decontamination on multicell massive MIMO systems", IEICE TECHNICAL REPORT, vol. 118, no. 254 (RCS2018-177), 11 October 2018 (2018-10-11), pages 143 - 148, XP009523632, ISSN: 0913-5685
TAKASHI FUJII, YOSHIMOTO OTA: "B-5-60 HAPS Multi-Gateway Feeder Link System Supports Transmission Interference Canceller Crash", PROCEEDINGS OF IEICE SOCIETY CONFERENCE; SEPTEMBER 10-13, 2019, vol. 1, 27 August 2019 (2019-08-27), pages 314, XP009523749
See also references of EP 3934304A4
Attorney, Agent or Firm:
KURODA Hisashi et al. (JP)
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