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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 18 of 18  /   
Committee Date Time Place Paper Title / Authors Abstract Paper #
SR 2021-05-21
14:00
Online Online [Technology Exhibit] 5G experimental trial based on smart spectrum
Kenta Umebayashi, Hiroki Iwata (TUAT), Hirofumi Nakajo (UEC), Hikaru Kawasaki (NICT), Yusaku Babazono, Yoshinori Yahiro (TUAT), Takeo Fujii, Koichi Adachi, Taiki Matsushima (UEC), Yusuke Shibata (ECATV), Kazuo Ibuka, Takeshi Matsumura, Fumihide Kojima (NICT) SR2021-18
 [more] SR2021-18
pp.120-127
SR 2020-11-18
14:20
Online Online A Study on Noise Power Estimation based on Goodness of Fit Statistics
Hiroki Iwata, Kenta Umebayashi (TUAT) SR2020-28
This paper focuses on spectrum sensing and spectrum measurement exploiting an energy detector. In this case, an noise po... [more] SR2020-28
pp.37-43
OME 2019-12-20
13:15
Saga avancée (Saga city) Structures and Physical Properties of Self-Assembled Helical Nanostructures Composed of Charge Transfer Complexes
Yoko Tatewaki, Hiroki Iwata, Satoshi Noguchi (TUAT), Sadafumi Nishihara (Hiroshima Univ.), Tomoyuki Akutagawa (Tohoku Univ.), Takayoshi Nakamura (Hokkaido Univ.) OME2019-38
 [more] OME2019-38
pp.13-15
SR 2019-12-06
10:50
Okinawa Ishigaki City Hall (Ishigaki Island) A Study on Setting of an Energy Detection Threshold with SNR Estimation
Hiroki Iwata, Kenta Umebayashi (TUAT) SR2019-102
Energy detection (ED) is a popular signal detection method for spectrum sensing and spectrum usage
measurement in dynam... [more]
SR2019-102
pp.75-82
RISING
(2nd)
2019-11-26
10:30
Tokyo Fukutake Learning Theater, Hongo Campus, Univ. Tokyo [Invited Lecture] Development of a Spectrum Usage Measurement System for Dynamic Spectrum Sharing
Hiroki Iwata, Ahmed Al-Tahmeesschi, Kenta Umebayashi (TUAT)
In dynamic spectrum sharing, statistical information in terms of spectrum usage such as spectrum occupancy
rate is usef... [more]

RISING
(2nd)
2019-11-26
14:10
Tokyo Fukutake Learning Theater, Hongo Campus, Univ. Tokyo [Poster Presentation] Spectrum Occupancy Prediction based on Recurrent Neural Network with State Identification
Yoshiki Kasahara, Hiroki Iwata, Ahmed Al-Tahmeesschi, Kenta Umebayashi (TUAT)
 [more]
SR 2019-11-04
11:00
Overseas Rutgers University Inn & Conference Center, NJ, USA [Poster Presentation] An Efficient Noise Floor Estimation for Spectrum Measurements
Hiroki Iwata, Kenta Umebayashi (TUAT) SR2019-68
Statistical information in terms of spectrum occupancy is useful for the smart dynamic spectrum sharing and it can be ob... [more] SR2019-68
pp.9-16
SeMI, RCS, NS, SR, RCC
(Joint)
2019-07-11
09:35
Osaka I-Site Nanba(Osaka) A study on Auto-Regressive modeling of Duty Cycle
Kohei Okawa, Hiroki Iwata, Kenta Umebayashi (Tokyo Univ. of Agriculture and Tech.), Janne Lehtomäki (Univ. of Oulu), Miguel López-Benítez (Univ. of Liver), Satya Joshi (Univ. of Oulu) SR2019-29
In dynamic spectrum sharing, it is useful to exploit statistical information on spectrum usage.
In this paper, we inve... [more]
SR2019-29
pp.59-64
SR 2019-05-31
10:00
Tokyo Tokyo Big Sight [Technology Exhibit] Development of Cooperative Spectrum Usage Measurement System Prototype for Smart Spectrum Access
Hiroki Iwata, Kenta Umebayashi (TUAT) SR2019-16
In Smart spectrum access (SSA), it is required to realize high-accurate spectrum usage measurements over the long-term, ... [more] SR2019-16
pp.97-103
OME 2019-02-27
16:05
Tokyo Tokyo University of Agriculture and Technology (Koganei Campus) Fabrication of Molecular Nanocoils composed of TTF Derivatives
Kentaro Iwamoto, Hiroki Iwata (TUAT), Sadafumi Nishihara (Hiroshima Univ.), Yoko Tatewaki (TUAT) OME2018-61
Charge transfer complex composed of Tetrathiafulvalene (TTF) and 7,7,8,8-Tetracyanoquinodimethane (TCNQ) showed high con... [more] OME2018-61
pp.33-36
SR 2018-10-31
13:25
Overseas Mandarin Hotel, Bangkok, Thailand [Poster Presentation] Neural Network-based Channel Occupancy Rate Prediction
Hiroki Iwata, Kenta Umebayashi (TUAT), Ahmed Al-Tahmeesschi, Miguel Lopez-Benitez (UoL) SR2018-88
A spectrum occupancy prediction can provide useful information to spectrum sharing-based wireless networks. In this pape... [more] SR2018-88
pp.75-82
SR 2018-05-25
10:00
Tokyo Tokyo big sight [Technology Exhibit] Development of Spectrum Usage Measurement System Prototype for Smart Spectrum Access -- Prediction of Spectrum Occupancy --
Hiroki Iwata, Kenta Umebayashi, Ryo Sato, Kento Yamada, Kohei Okawa, Yoshiki Kasahara (TUAT), Janne Lehtomaki (Univ. of Oulu), Miguel Lopez-Benitez (Univ. of Liverpool) SR2018-17
Smart spectrum access (SSA) can achieve a high-efficient spectrum sharing utilizing the prior information regarding spec... [more] SR2018-17
pp.99-106
SR 2018-01-26
09:55
Fukuoka Fukuoka univ. Time and frequency varying noise floor estimation for spectrum usage measurement
Hiroki Iwata, Kenta Umebayashi (TUAT), Janne Lehtomaki (UoO), Miguel Lopez-Benitez (UoL) SR2017-101
For efficient spectrum sharing between heterogeneous wireless systems, statistical information regarding spectrum use by... [more] SR2017-101
pp.43-50
SR 2017-05-26
10:00
Tokyo Tokyo big sight [Technology Exhibit] Development of Smart Spectrum Access Prototype
Hiroki Iwata, Kenta Umebayashi, Yoshitaka Tamaki, Daiki Cho, Ryo Sato (TUAT), Shusuke Narieda (NIT, Akashi college) SR2017-16
Smart spectrum access (SSA) corresponds to an enhanced dynamic spectrum access (DSA) and its target is to realize the sp... [more] SR2017-16
pp.97-104
SR 2016-01-21
13:00
Nagasaki Fukue-bunka-kaikan Analysis of low-cost Welch FFT segment size selection method for spectrum usage measurement
Hiroki Iwata, Kenta Umebayashi (TUAT), Janne Lehtomaki (Univ. of Oulu), Yasuo Suzuki (TUAT) SR2015-72
Smart Spectrum Access (SSA), which is an advanced Dynamic Spectrum Access (DSA) exploits any statistical information of ... [more] SR2015-72
pp.1-8
SR, SRW
(Joint)
(2nd)
2015-10-27
09:30
Tokyo KKE [Technology Exhibit] Spectrum awareness system prototype for smart spectrum access
Kenta Umebayashi, Riki Mizuchi, Hiroki Iwata, Kazuhiro Hayashi, Masanao Kobayashi, Samuli Tiiro, Yoshitaka Tamaki, Tatsuya Maruyama (TUAT), Janne Lehtomaki (UoO), Miguel Lopez-Benitez (UoL), Yasuo Suzuki (TUAT)
 [more]
SR 2015-01-30
13:50
Hokkaido KKR Hakodate Welch FFT segment size selection method for Duty Cycle estimation
Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro (TUAT), Janne Lehtomaki (Univ. of Oulu), Yasuo Suzuki (TUAT) SR2014-110
In dynamic spectrum access (DSA) and the scenario with dynamic primary user (PU), spectrum sensing with reasonably low c... [more] SR2014-110
pp.101-108
SR 2014-10-31
13:00
Overseas I2R, Singapore [Technology Exhibit] Development of a measurement system for spectrum awareness -- Duty estimation based on Welch-FFT --
Hiroki Iwata, Kenta Umebayashi, Riki Mizuchi, Tatsuya Maruyama, Kazuki Moriwaki, Samuli Tiiro (TUAT), Janne Lehtomaki (Univ. of Oulu), Yasuo Suzuki (TUAT) SR2014-89
To resolve the spectrum scarcity problem, dynamic spectrum access (DSA) has been investigated recently. In DSA, an unlic... [more] SR2014-89
pp.171-177
 Results 1 - 18 of 18  /   
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