Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Takashi Akao"'
Publikováno v:
ICT Express, Vol 5, Iss 4, Pp 271-275 (2019)
This paper newly proposes a direct antenna array control approach to reduce channel spatial correlation for multiuser spatial multiplexing. Conventional rectangular arrays can form three dimensional beams and have superior signal separation performan
Externí odkaz:
https://doaj.org/article/754d24e4e41a404eba4a9b82c38d245f
Publikováno v:
ICT Express, Vol 5, Iss 4, Pp 276-279 (2019)
This paper proposes a modified pilot selection for channel estimation of systematic polar coded MIMO-OFDM. Polar codes provably achieve the theoretical limit for communication systems and systematic polar codes generate the codeword that has the same
Externí odkaz:
https://doaj.org/article/c80e8a3ddc38436aba119a1a36f998a5
Publikováno v:
ISPACS
This paper proposes a modified pilot selection for systematic polar coded MIMO-OFDM channel estimation. Polar codes provably achieve the theoretical limit for communication systems and systematic polar codes generate the codeword that has the same va
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0caad68e1748166de5d92e2ca54e20e1
https://doi.org/10.1109/ispacs.2018.8923173
https://doi.org/10.1109/ispacs.2018.8923173
Publikováno v:
ISPACS
ICT Express, Vol 5, Iss 4, Pp 271-275 (2019)
ICT Express, Vol 5, Iss 4, Pp 271-275 (2019)
This paper newly proposes a direct antenna array control approach to reduce channel spatial correlation for multiuser spatial multiplexing. Conventional rectangular arrays can form three dimensional beams and have superior signal separation performan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9d3ff2d0282077e2ec7034252487e65
https://doi.org/10.1109/ispacs.2018.8923368
https://doi.org/10.1109/ispacs.2018.8923368
Publikováno v:
2018 18th International Symposium on Communications and Information Technologies (ISCIT).
This paper proposes a low complexity direction of arrival (DOA) estimation method for two-dimensional (2D) massive multiple-input multiple-output (MIMO) systems. The conventional Multiple SIgnal Classification (MUSIC) algorithm of an example of 2D DO
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88defc46850d1b3f732ad9f96310732e
https://doi.org/10.1109/iscit.2018.8587926
https://doi.org/10.1109/iscit.2018.8587926
Publikováno v:
2018 18th International Symposium on Communications and Information Technologies (ISCIT).
Due to the demand for high-speed and large-capacity, wider transmission bandwidth is essential in wireless communication systems. It causes frequency resource shortage especially in microwave band. Therefore, efficient use of frequency resources even
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f0b53fee79c27cbcb9f5c5bbf11db6e
https://doi.org/10.1109/iscit.2018.8587852
https://doi.org/10.1109/iscit.2018.8587852
Publikováno v:
SoftCOM
In recent years, it is required to realize higher speed and higher quality mobile communication due to the increase in Internet use. Adaptive modulation and coding (AMC) scheme is now commonly implemented to maximize the throughput performance under
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7289014d14cd582953f911ab0610ccdf
https://doi.org/10.23919/softcom.2018.8555762
https://doi.org/10.23919/softcom.2018.8555762
Publikováno v:
WPMC
This paper improves interference suppression performance of Common Correlation Matrix (CCM) based Sample Matrix Inversion (SMI) adaptive array antenna algorithm. Assuming multicarrier systems such as orthogonal frequency division multiplexing (OFDM),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08c721747d878629abb0b17bbf05c870
https://doi.org/10.1109/wpmc.2017.8301888
https://doi.org/10.1109/wpmc.2017.8301888
Autor:
Takashi Akao, Yoji Kubota, Minoru Maeda, K. Yasohama, Hisayasu Kobayashi, Daisuke Uchiyama, Takateru Kawakami, K. Mizuno
Publikováno v:
Cryogenics. 47:282-286
A novel MgB 2 superconducting wire has been fabricated by the in situ powder-in-tube method with fine B powders (0.25 μm) and coarse Mg ones (150 μm). The core of this wire has a fibrous structure, which consists of a lot of MgB 2 filaments. The cr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3921960e7ac255528885da3ba00c62f
https://doi.org/10.1016/j.cryogenics.2007.03.003
https://doi.org/10.1016/j.cryogenics.2007.03.003
Autor:
Y. Kubota, Daisuke Uchiyama, Hisayasu Kobayashi, K. Mizuno, Takateru Kawakami, K. Yasohama, Minoru Maeda, Takashi Akao
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 15:3345-3348
Cu sheathed MgB/sub 2/ wires with a diameter of 2.50 mm and 0.93 mm have been fabricated by the In-Situ Powder-in-Tube PIT method. We have studied three subjects; the morphology of the wire core affected by the fabrication process of cold rolling, co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::856a112991584649064f9bed51a5241c
https://doi.org/10.1109/tasc.2005.848884
https://doi.org/10.1109/tasc.2005.848884