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All Technical Committee Conferences (Searched in: All Years)
| Committee | Date Time | Place | Paper Title / Authors | Abstract | Paper # | |
| RCS, SR, SRW (Joint) |
2023-03-01 11:15 |
Tokyo | Tokyo Institute of Technology, and Online (Primary: On-site, Secondary: Online) |
Performance Improvement of Linear MIMO Reception over Time-Variant Channels Using Null-Space Expansion Yuki Ohi, Hidekazu Murata (Yamaguchi Univ.), Makoto Taromaru (Hukuoka Univ.), Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT)  RCS2022-250 |
This paper considers the improvement of MIMO signal separation performance using a linear spatial filter in a time-varyi... [more] | RCS2022-250 pp.21-24 |
| RCS, SR, SRW (Joint) |
2023-03-03 15:50 |
Tokyo | Tokyo Institute of Technology, and Online (Primary: On-site, Secondary: Online) |
Simultaneous Beam Search with Multiple Distributed Antennas for Distributed Antenna System Shuki Wai, Takuto Arai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) RCS2022-295 |
Distributed antenna (DA) system using high-frequency bands such as millimeter-wave and sub-terahertz is expected to be o... [more] | RCS2022-295 pp.249-254 |
| SeMI, SeMI (Joint) |
2023-01-19 15:35 |
Tokushima | Naruto grand hotel (Primary: On-site, Secondary: Online) |
[Short Paper]
Comparative Study of Object Localization by Millimeter Wave Sensing and Sound Wave Sensing Ryosuke Hanahara, Itsuki Yonemura, Koji Yamamoto (Kyoto Univ.), Takuto Arai, Shuki Hideki, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) SeMI2022-84 |
This paper compares sensing of indoor communication environments using the beam search method in millimeter-wave (mmWave... [more] | SeMI2022-84 pp.54-56 |
| SeMI, SeMI (Joint) |
2023-01-19 16:05 |
Tokushima | Naruto grand hotel (Primary: On-site, Secondary: Online) |
[Short Paper]
Received SNR Prediction Using Two-sided Beam Search in mmWave Communication: An Experimental Study Itsuki Yonemura, Takamochi Kanda, Ryosuke Hanahara, Koji Yamamoto (Kyoto Univ.), Takuto Arai, Syuki Wai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) SeMI2022-87 |
This paper experimentally demonstrates a novel received signal-to-noise ratio (SNR) prediction based on a two-sided beam... [more] | SeMI2022-87 pp.65-69 |
| RISING (3rd) |
2022-10-31 10:30 |
Kyoto | Kyoto Terrsa (Day 1), and Online (Day 2, 3) | [Poster Presentation]
Blockage Prediction Using Transmit/Receive Beam-pairs in mmWave Networks Itsuki Yonemura, Takamochi Kanda, Ryosuke Hanahara, Koji Yamamoto (Kyoto Univ.), Takuto Arai, Shuki Wai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) |
This study experimentally demonstrates a novel blockage prediction based on exhaustive beam-pair scan in millimeter wav... [more] | |
| AP | 2022-04-15 11:50 |
Yamagata | Yamagata Syokuryo Kaikan (Primary: On-site, Secondary: Online) |
A study on gain reduction suppression in a wideband slot array antenna with a reflector Naoya Yamamoto, Takashi Hikage, Manabu Yamamoto (Hokkaido Univ.), Shuki Wai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) AP2022-6 |
[more] | AP2022-6 pp.28-33 |
| RCS | 2021-10-21 13:00 |
Online | Online | Initial access beam search method with variable beam width according to the area size Takuto Arai, Tatsuhiko Iwakuni, Syuki Wai, Daisei Uchida, Naoki Kita (NTT) RCS2021-122 |
High gain antennas using narrow-beamforming are required to compensate for high propagation loss in high frequency bands... [more] | RCS2021-122 pp.25-30 |
| RCS | 2021-10-21 13:25 |
Online | Online | A New Beam Search Based on Combination History of Selected Beams among Antennas for Distributed Antenna System Shuki Wai, Tatsuhiko Iwakuni, Takuto Arai, Daisei Uchida, Naoki Kita (NTT) RCS2021-123 |
Distributed antenna system using high-frequency bands such as millimeter-wave and sub-terahertz is expected to be one of... [more] | RCS2021-123 pp.31-36 |
| NS, RCS (Joint) |
2020-12-18 13:25 |
Online | Online | [Invited Lecture]
Distributed Antenna Systemes using High-Frequency-Band targeting 6G Wireless Networks Daisei Uchida, Tatsuhiko Iwakuni, Naoki Kita, Takeshi Onizawa (NTT), Yoshihisa Kishiyama, Satoshi Suyama, Satoshi Nagata, Takahiro Asai (docomo) NS2020-101 RCS2020-148 |
High-Speed and broadband network transformation is needed for multi-points collecting sensing data and distributing movi... [more] | NS2020-101 RCS2020-148 pp.73-78 |
| RCS, RCC, ASN, NS, SR (Joint) |
2016-07-22 14:10 |
Aichi | Proposal of Access Point (AP) location algorithm based on High Density User Areas in Adaptive Movable AP Systems Daisuke Goto, Takuto Arai, Masashi Iwabuchi, Tatsuhiko Iwakuni, Kazuki Maruta (NTT) RCS2016-125 |
We proposed Adaptive Movable Access Point System (AMAP) which controls APs locations for improvement of traffic offload ... [more] | RCS2016-125 pp.159-164 |
|
| IN, RCS (Joint) |
2016-05-20 15:15 |
Tokyo | Kikai-Shinko-Kaikan Bldg. | AMAP: Adaptive Movable Access Point System for Offloading Efficiency Enhancement Takuto Arai, Daisuke Goto, Masashi Iwabuchi, Tatsuhiko Iwakuni, Kazuki Maruta (NTT) RCS2016-43 |
Offloading data traffic is one of the most important solutions for cellular system congestion. Congestion of the cellula... [more] | RCS2016-43 pp.107-112 |
| 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) |
| RCS, SAT (Joint) |
2015-08-18 09:30 |
Fukuoka | Fukuoka Univ. | High Efficient Spatial Division Multiplexing Technique with the First Eigen-mode Parallel Transmission on Millimeter Wave Band in LOS Environment
-- Basic Concept and Its Performance Evaluation -- Atsushi Ohta, Takuto Arai, Yushi Shirato, Kazuki Maruta, Tatsuhiko Iwakuni, Masataka Iizuka (NTT) RCS2015-144 |
[more] | RCS2015-144 pp.73-78 |
| RCS, SAT (Joint) |
2015-08-18 09:55 |
Fukuoka | Fukuoka Univ. | High Efficient Spatial Division Multiplexing Technique with the First Eigen-mode parallel transmission on millimeter wave band in LOS environment
-- Effective channel feedback scheme -- Takuto Arai, Atsushi Ohta, Yushi Shirato, Kazuki Maruta, Tatsuhiko Iwakuni, Masataka Iizuka (NTT) RCS2015-145 |
In the previous paper, the authors have discussed the practical Massive MIMO system in LOS environment where the base st... [more] | RCS2015-145 pp.79-84 |
| RCS, SAT (Joint) |
2015-08-18 15:30 |
Fukuoka | Fukuoka Univ. | Uplink Interference Suppression by MMSE-CMA Adaptive Array on Multicell Massive MIMO Systems Kazuki Maruta, Atsushi Ohta, Yushi Shirato, Satoshi Kurosaki, Takuto Arai, Tatsuhiko Iwakuni, Masataka Iizuka (NTT) RCS2015-154 |
This paper proposes uplink interference suppression scheme for multicell massive MIMO systems. Single frequency reuse is... [more] | RCS2015-154 pp.129-134 |
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