Title:
INTERFERENCE CANCELING BY FIXED DIVISION OF FEEDER LINK TRANSMISSION BAND IN MULTIPLE GATEWAY HAPS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/195294
Kind Code:
A1
Abstract:
The present invention suppresses interference in multi-feeder links at the same frequency between an airborne communication relay device and multiple gateway (GW) stations. In the present invention, a transmission signal band of a feeder link is divided into multiple divisional frequency bands. On the basis of reception results of pilot signals obtained by reception and separation thereof from the multiple GW stations, multiple propagation path responses between the multiple GW stations and a feeder link antenna of the communication relay device are estimated for the multiple divisional frequency bands, with the respective center frequencies of the divisional frequency bands defined as estimated frequencies. On the basis of the multiple propagation path responses, weights for suppressing interference signals that perform interference when the transmission signals transmitted from the GW stations are received with directional beams corresponding to the remaining other GW stations, are respectively calculated for the divisional frequency bands. For the respective divisional frequency bands, reception signals received in directional beams corresponding to GW stations are respectively subtracted from the products of reception signals received in directional beams corresponding to the other GW stations and the weights corresponding to the other GW stations.
More Like This:
Inventors:
FUJII TAKAFUMI (JP)
FUJII TERUYA (JP)
FUJII TERUYA (JP)
Application Number:
PCT/JP2020/005477
Publication Date:
October 01, 2020
Filing Date:
February 13, 2020
Export Citation:
Assignee:
HAPSMOBILE INC (JP)
International Classes:
H04J1/10; H04B7/024; H04B7/0413; H04B7/08; H04B7/185; H04W84/06
Domestic Patent References:
| WO2018207612A1 | 2018-11-15 |
Foreign References:
| US20160046387A1 | 2016-02-18 | |||
| US9798329B2 | 2017-10-24 | |||
| US20170126309A1 | 2017-05-04 | |||
| US20160046387A1 | 2016-02-18 |
Other References:
KAZUKI MARUTA , MASATOSHI YASU: "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
FUJII, TAKASHI ET AL.: "B-5-60 HAPS Multi-Gateway Feeder Link System Supports Transmission Interference Canceller Crash", PROCEEDINGS OF THE 2019 IEICE SOCIETY CONFERENCE; SEPTEMBER 10-13, 2019, vol. 1, 27 August 2019 (2019-08-27), pages 314, XP009523749
See also references of EP 3952147A4
FUJII, TAKASHI ET AL.: "B-5-60 HAPS Multi-Gateway Feeder Link System Supports Transmission Interference Canceller Crash", PROCEEDINGS OF THE 2019 IEICE SOCIETY CONFERENCE; SEPTEMBER 10-13, 2019, vol. 1, 27 August 2019 (2019-08-27), pages 314, XP009523749
See also references of EP 3952147A4
Attorney, Agent or Firm:
KURODA Hisashi et al. (JP)
Download PDF: