Title:
INTERFERENCE CANCELING BY VARIABLE DIVISION OF FEEDER LINK TRANSMISSION BAND IN MULTIPLE-GATEWAY HAPS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/202820
Kind Code:
A1
Abstract:
The purpose of the present invention is to suppress interference in multiple feeder links of the same frequency between an aerial floating-type communication relay device and a plurality of gateway (GW) stations, while suppressing power consumption by the communication relay device. A relay communication station of the communication relay device switches to and performs first interference suppression processing or second interference suppression processing. In the first interference suppression processing, a feeder link transmission signal band is not divided, and a propagation path response that is estimated using one frequency in the transmission signal band as an estimated frequency on the basis of the reception result of a pilot signal is used to suppress an interference signal relating to interference caused by a transmission signal transmitted from the gateway station being received by a directional beam corresponding to another gateway station. In the second interference suppression processing, the feeder link transmission signal band is divided into a plurality of divided frequency bands, and, with respect to each of the divided frequency bands, a propagation path response that is estimated using one frequency in the divided frequency band as an estimated frequency on the basis of the reception result of the pilot signal is used to suppress the interference signal.
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Inventors:
FUJII TAKAFUMI (JP)
FUJII TERUYA (JP)
FUJII TERUYA (JP)
Application Number:
PCT/JP2020/005481
Publication Date:
October 08, 2020
Filing Date:
February 13, 2020
Export Citation:
Assignee:
HAPSMOBILE INC (JP)
International Classes:
H04W16/26; H04B7/022; H04B7/0413; H04B7/06; H04B7/08; H04B7/185; H04J1/00; H04W16/28; H04W84/06
Foreign References:
| JP2002534901A | 2002-10-15 | |||
| US20160046387A1 | 2016-02-18 |
Other References:
TAKAFUMI FUJII , YOSHICHIKA OHTA : "A Study on Feeder Link Interference Reduction for Multi-Gateway HAPS System", LECTURE PROCEEDINGS OF THE 2019 GENERAL CONFERENCE OF IEICE, 5 March 2019 (2019-03-05), pages 289, XP009524085
TAKASHI FUJII; YOSHIMOTO OTA: "A Study on Efficient Spectrum Utilization for Feeder Link in HAPS System", LECTURE PROCEEDINGS 1 OF THE 2018 COMMUNICATION SOCIETY CONFERENCE OF IEICE, 28 August 2018 (2018-08-28), pages 317, XP009524086, ISSN: 1349-144X
TAKASHI FUJII; YOSHIMOTO OTA: "A Study on Efficient Spectrum Utilization for Feeder Link using Multipe Gateways in HAPS System", IEICE TECHNICAL REPORT, vol. 118, no. 311, 13 November 2018 (2018-11-13), pages 143 - 148, XP009524055, ISSN: 0913-5685
See also references of EP 3952388A4
TAKASHI FUJII; YOSHIMOTO OTA: "A Study on Efficient Spectrum Utilization for Feeder Link in HAPS System", LECTURE PROCEEDINGS 1 OF THE 2018 COMMUNICATION SOCIETY CONFERENCE OF IEICE, 28 August 2018 (2018-08-28), pages 317, XP009524086, ISSN: 1349-144X
TAKASHI FUJII; YOSHIMOTO OTA: "A Study on Efficient Spectrum Utilization for Feeder Link using Multipe Gateways in HAPS System", IEICE TECHNICAL REPORT, vol. 118, no. 311, 13 November 2018 (2018-11-13), pages 143 - 148, XP009524055, ISSN: 0913-5685
See also references of EP 3952388A4
Attorney, Agent or Firm:
KURODA Hisashi et al. (JP)
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