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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 36  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
RCS, SR, SRW
(Joint)
2024-03-13
10:20
Tokyo The University of Tokyo (Hongo Campus), and online
(Primary: On-site, Secondary: Online)
Study on Time-Varying Tolerance Enhancement Using Null-Space Expansion Technique for Linear MIMO Reception
Shohei Kobayashi, Yuki Ohi, Hidekazu Murata (Yamaguchi Univ.), Makoto Taromaru (Hukuoka Univ.), Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT)
(To be available after the conference date) [more]
AP, RCS
(Joint)
2023-11-16
11:00
Kumamoto Kumamoto Prefectural Workers' Welfare Hall
(Primary: On-site, Secondary: Online)
[Invited Lecture] Fast Beam Search for Distributed Antenna Systems in High Frequency Bands
Shuki Wai, Takuto Arai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT) AP2023-143 RCS2023-166
In order to further increase the capacity of wireless communications, attention is focused on the combination of high-fr... [more] AP2023-143 RCS2023-166
pp.67-72(AP), pp.71-76(RCS)
RISING
(3rd)
2023-10-31
13:00
Hokkaido Kaderu 2・7 (Sapporo) [Poster Presentation] Object Position Prediction Leveraging Both-side Angular Power Profiles in mmWave Communications
Itsuki Yonemura (Kyoto Univ.), Koji Yamamoto (KIT), Kazunori Hayashi (Kyoto Univ.), Takuto Arai, Shuki Wai, Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT)
This study experimentally demonstrates a novel position prediction leveraging both-side angular power profiles (APPs) sc... [more]
RCS 2023-10-19
16:40
Kagawa Kagawa University (Saiwai-cho Campus), and online
(Primary: On-site, Secondary: Online)
Transmission Performance and Handover Control Technique of 60-GHz Wireless LAN on Indoor Open Environment
Tatsuhiko Iwakuni, Daisei Uchida, Takuto Arai, Shuki Wai, Naoki Kita (NTT) RCS2023-137
Wireless communication system using high-frequency bands requires in-sight communication due to straightness of radio wa... [more] RCS2023-137
pp.39-44
SIS, ITE-BCT 2023-10-12
14:45
Yamaguchi HISTORIA UBE
(Primary: On-site, Secondary: Online)
Performance evaluation of null-space expanded linear reception technique over time-varying MIMO channels
Yuki Ohi, Hidekazu Murata (Yamaguchi Univ.), Makoto Taromaru (Fukuoka Univ.), Tatsuhiko Iwakuni, Daisei Uchida, Naoki Kita (NTT)
This paper considers the improvement of multiple-input multiple-output signal separation performance using a linear spat... [more]
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 mmWave Sensing and Acoustic 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, Ryosuke Hanahara, Takamochi Kanda, 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
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