Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Fumihiro Yamashita"'
Publikováno v:
IEEE Access, Vol 12, Pp 50280-50286 (2024)
We investigated low Earth orbit satellite (LEO) communications applying Multiple-Input/Multiple-Output (MIMO) technology to the feeder link transmission between a satellite and gateway antennas to improve the channel capacity. This paper calls LEO sa
Externí odkaz:
https://doaj.org/article/5c3712689e60484cb79452c3d7bd0954
Autor:
Kansuke Kumazawa, Hiraku Okada, Munehiro Matsui, Koyo Tategami, Daisuke Goto, Kiyohiko Itokawa, Fumihiro Yamashita, Masaaki Katayama
Publikováno v:
IEEE Access, Vol 11, Pp 135377-135384 (2023)
In satellite Internet-of-Things (IoT) systems using the 920-MHz band Low Power Wide Area, available channels for each terminal are limited to avoid interference with terrestrial networks. Since this limitation depends on the location of the terminal,
Externí odkaz:
https://doaj.org/article/fb46805e478047999d8bf42ea0411c09
Autor:
Koki Hamajima, Kei Yasukawa, Masazumi Ueba, Hisayoshi Kanou, Munehiro Matsui, Junichi Abe, Kiyohiko Itokawa, Fumihiro Yamashita
Publikováno v:
Aerospace, Vol 10, Iss 4, p 323 (2023)
Among several usages of unmanned aerial vehicles (UAV), wireless relay systems for high altitudes using fixed-wing UAVs, or high-altitude platform stations (HAPS), are some of the most promising applications. To realize the systems by making the most
Externí odkaz:
https://doaj.org/article/3280274d03cb42258b88ab917ad57b96
Publikováno v:
NTT Technical Review. Aug2023, Vol. 21 Issue 8, p23-27. 5p.
Publikováno v:
IEICE Transactions on Communications. :446-454
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cae75707648cf4ca87d4a7b29e3b03d1
https://doi.org/10.1587/transcom.2020ebp3058
https://doi.org/10.1587/transcom.2020ebp3058
Publikováno v:
2022 IEEE Wireless Communications and Networking Conference (WCNC).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f9eb1ac2519c80dcb63982f6090ecbf9
https://doi.org/10.1109/wcnc51071.2022.9771606
https://doi.org/10.1109/wcnc51071.2022.9771606
Autor:
Daisuke Goto, Fumihiro Yamashita
Publikováno v:
IEICE Transactions on Communications. :842-851
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fcc77ce50381aab4868ca43b77a7c2c
https://doi.org/10.1587/transcom.2019ebp3158
https://doi.org/10.1587/transcom.2019ebp3158
Autor:
Daiki Haraguchi, Fumihiro Yamashita, Hiroyuki Kobashi, Hiroki Shibayama, Yasuyoshi Kojima, Daisuke Goto
Publikováno v:
IEICE Communications Express. 9:48-53
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2edce253f46b08d924439074610c5226
https://doi.org/10.1587/comex.2019xbl0134
https://doi.org/10.1587/comex.2019xbl0134
Publikováno v:
NTT Technical Review. Dec2022, Vol. 20 Issue 12, p36-40. 5p.
Autor:
Daiki Haraguchi, Hiroyuki Kobashi, Yasuyoshi Kojima, Hiroki Shibayama, Fumihiro Yamashita, Daisuke Goto
Publikováno v:
Advances in Communications Satellite Systems: Proceedings of the 37th International Communications Satellite Systems Conference (ICSSC-2019) ISBN: 9781839531453
We have been studying a direct spectrum division transmission (DSDT) technique that can divide a single carrier signal into multiple subspectra and assign them to dispersed frequency resources of the satellite transponder to improve the spectrum effi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1919add9faf33bde47c6f9f56fae66be
https://doi.org/10.1049/pbte095e_ch13
https://doi.org/10.1049/pbte095e_ch13
