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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 30  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
CQ, CS
(Joint)
2022-05-13
13:50
Fukui Fukui (Fuku Pref.)
(Primary: On-site, Secondary: Online)
[Special Invited Talk] Analog-RoF and Distributed MIMO Techniques in Higher Frequency Bands for 6G/IOWN
Takeshi Onizawa, Naoki Kita, Yushi Shirato, Daisei Uchida, Hideki Toshinaga (NTT) CQ2022-15
In this report, we describe analog-radio over fiber (A-RoF) and distributed multiple-input multiple-output (MIMO) techni... [more] CQ2022-15
pp.80-85
AP, WPT
(Joint)
2022-01-21
13:30
Tottori Kenmin-Fureai-Kaikan
(Primary: On-site, Secondary: Online)
Proposal on Novel Staircase Array Antenna Configuration utilizing Stacked Butler Matrix
Hideya So, Yoshitada Watanabe, Takana Kaho (SIT), Mizuki Suga, Takuto Arai, Yushi Shirato, Hideki Toshinaga, Daisei Uchida, Naoki Kita (NTT) AP2021-151
Massive Multiple-Input Multiple-Output (Massive MIMO), which uses a large number of antenna elements, has been investiga... [more] AP2021-151
pp.92-97
MWP 2021-11-26
13:50
Online Online [Invited Talk] R&D for Higher Frequency Bands Radio-over-Fiber Systems
Yushi Shirato, Kota Ito, Mizuki Suga, Takuto Arai, Yuta Takahashi, Yasuyoshi Yamamoto, Naoki Kita (NTT) MWP2021-31
In order to enhance the transmission capacity, it is effective to use higher frequency band radio waves with abundant fr... [more] MWP2021-31
pp.6-11
AP, SANE, SAT
(Joint)
2021-07-30
14:30
Online Online [Invited Lecture] Visibility Analysis in a Human Body Shadowing Environment and Distributed Antenna Installations for Millimeter and Terahelz Wave Mobile Communications
Naoki Kita, Yushi Shirato, Daisei Uchida (NTT), Koji Yamamoto (Kyoto Univ.) AP2021-45
Development ofmmWave or higher frequency bands where rich frequency bandwidth resources are available is widely discusse... [more] AP2021-45
pp.120-125
RCS, AP, UWT
(Joint)
2020-11-26
15:15
Online Online Stochastic Geometry Analysis of Probability and Autocorrelation of Human Blockage in mmWave Communications
Koji Yamamoto (Kyoto Univ.), Chun-hsiang Huang, Yushi Shirato, Daisei Uchida, Naoki Kita (NTT) RCS2020-128
This report provides the probabilities of human-body blockage and blockage avoidance, and autocorrelation function for h... [more] RCS2020-128
pp.99-103
MW, EST, EMCJ, PEM, IEE-EMC [detail] 2020-10-22
12:15
Online Online An Investigation on Transmission Characteristics Improvement Method by Double-sided Impedance Matching Using Metal Patch Array on Reinforced Concrete Wall
Takanobu Nakajyo, Atsuhiro Nishikata (Tokyo Tech), Kota Ito, Yushi Shirato, Naoki Kita (NTT Access Network Service Systems Laboratories) EMCJ2020-31 MW2020-45 EST2020-33
 [more] EMCJ2020-31 MW2020-45 EST2020-33
pp.36-41
MWP 2020-05-28
14:30
Online Online Experimental Evaluation of Remote Beamforming Scheme for Higher Frequency Band Radio-over-Fiber Systems
Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita (NTT) MWP2020-2
We have proposed remote beamforming scheme for higher frequency band, which can remotely control the beam direction of b... [more] MWP2020-2
pp.7-12
EMCJ, MICT
(Joint)
2020-03-13
16:05
Tokyo Kikai-Shinko-Kaikan Bldg.
(Cancelled but technical report was issued)
EMCJ2019-95 In recent years, radio resources such as allocated frequency, polarization, space, and time have been tightened due to t... [more] EMCJ2019-95
pp.15-20
MIKA
(2nd)
2019-10-03
11:15
Hokkaido Hokkaido Univ. [Poster Presentation] ASK+BPSK Modulation Experiment for the Full-Duplex Communication by using 3×4 Element Van-Atta Array
Yuki Mizukoshi, Atsuhiro Nishikata (Tokyo Tech), Kota Ito, Yushi Shirato, Naoki Kita (NTT)
 [more]
EMCJ 2019-07-18
16:20
Tokyo Kikai-Shinko-Kaikan Bldg. Establishing transmission and scattering simulation model of building wall at 2.4GHz band with experimental evaluation of transmission characteristics
Takanobu Nakajyo, Atsuhiro Nishikata (Tokyo Tech), Kota Ito, Yushi Shirato, Naoki Kita (NTT) EMCJ2019-29
 [more] EMCJ2019-29
pp.65-69
WPT, AP
(Joint)
2019-01-18
12:30
Aichi Toyota Automobile Museum [Invited Lecture] Study on Characteristics of Arrival Angular Spread at High Microwave-band
Naoki Kita, Yushi Shirato, Hideki Toshinaga (NTT) AP2018-162
 [more] AP2018-162
pp.63-68
NS, ASN, RCC, RCS, SR
(Joint)
2017-07-21
11:30
Hokkaido Hokkaido Univ. Antenna Design for Low Correlation Directional Beam-forming on Wireless Entrance Systems with High Frequency Band
Atsushi Ohta, Ken Tanaka, Yushi Shirato, Mizuki Suga, Kazuto Goto, Masataka Iizuka (NTT) RCS2017-136
 [more] RCS2017-136
pp.221-226
NS, RCS
(Joint)
2016-12-22
15:10
Ishikawa   Digital Assisted Analog Beamforming (DAABF) on Millimeter Wave Massive Antenna Array -- Basic Concept of DAABF --
Atsuhi Ohta, Kazuki Maruta, Yushi Shirato, Satoshi Kurosaki, Ken Tanaka, Masataka Iizuka (NTT) RCS2016-232
 [more] RCS2016-232
pp.135-140
NS, RCS
(Joint)
2016-12-22
15:35
Ishikawa   Digital Assisted Analog Beamforming (DAABF) on Millimeter Wave Massive Antenna Array -- Performance Evaluation of DAABF via Computer Simulation --
Kazuki Maruta, Atsuhi Ohta, Yushi Shirato, Satoshi Kurosaki, Ken Tanaka, Masataka Iizuka (NTT) RCS2016-233
Toward the 5th Generation Mobile Communications (5G), a lot of wireless communication technologies such as massive MIMO ... [more] RCS2016-233
pp.141-146
RCS 2016-04-22
14:10
Aomori Romantopia, A Landscape of Forest and Stars, Hirosaki City Multiuser Parallel Transmission by Sub Array Time Domain Beamforming on Massive MIMO using Higher Frequency Bands
Kazuki Maruta, Atsushi Ohta, Takuto Arai, Yushi Shirato, Satoshi Kurosaki, Tatsuhiko Iwakuni, Masataka Iizuka (NTT) RCS2016-20
Drastic improvements of transmission rate and system capacity are required towards 5th generation mobile communications ... [more] RCS2016-20
pp.111-116
RCS 2016-04-22
14:35
Aomori Romantopia, A Landscape of Forest and Stars, Hirosaki City Experimental Verification of Multiuser Massive MIMO Null-Space Expansion using Measured Channel State Information
Tatsuhiko Iwakuni, Kazuki Maruta, Atsushi Ohta, Yushi Shirato, Takuto Arai, Masataka Iizuka (NTT) RCS2016-21
Transmission capacity of multiuser MIMO systems is degraded by inter-user interference (IUI) caused due to channel time ... [more] RCS2016-21
pp.117-122
NS, RCS
(Joint)
2015-12-18
13:30
Ehime Matsuyama Community Center Wireless Backhaul for Train-type Moving Cell with Time-domain Beam-forming
Atsushi Ohta, Yushi Shirato, Satoshi Kurosaki, Kazuki Maruta, Takuto Arai, Tatsuhiko Iwakuni, Ken Tanaka, Masataka Iizuka (NTT) RCS2015-272
 [more] RCS2015-272
pp.169-174
AP, RCS, WPT, SAT
(Joint)
2015-11-04
12:15
Okinawa Okinawa Prefectural Museum & Art Museum Transmission Performance Evaluation of Multiuser Massive MIMO Null-Space Expansion for Time Varying Channel
Tatsuhiko Iwakuni, Kazuki Maruta, Atsushi Ohta, Yushi Shirato, Takuto Arai, Masataka Iizuka (NTT) RCS2015-198
Inter-user interference (IUI) caused by channel time variation reduces multiuser MIMO transmission capacity. Massive MIM... [more] RCS2015-198
pp.49-54
AP, RCS, WPT, SAT
(Joint)
2015-11-05
09:30
Okinawa Okinawa Prefectural Museum & Art Museum Multiuser Massive MIMO Exploiting First Eigenmode Transmission in Higher Frequency Bands
Kazuki Maruta, Tatsuhiko Iwakuni, Atsushi Ohta, Yushi Shirato, Takuto Arai, Masataka Iizuka (NTT) RCS2015-205
Drastic improvements of transmission rate and system capacity are required towards 5th generation mobile communications ... [more] RCS2015-205
pp.91-96
AP, RCS, WPT, SAT
(Joint)
2015-11-06
14:00
Okinawa Okinawa Prefectural Museum & Art Museum [Invited Lecture] Effective use of the First Eigen-modes on Massive MIMO communication in LOS environment
Atsushi Ohta, Yushi Shirato, Kazuki Maruta, Takuto Arai, Tatsuhiko Iwakuni, Masataka Iizuka (NTT) AP2015-150 RCS2015-239
 [more] AP2015-150 RCS2015-239
pp.231-236(AP), pp.293-298(RCS)
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