Hiroki IWATA

Mail : iwa-hiro [at] st.go.tuat.ac.jp From : Miyakonojo-city, Miyzaki, Japan Education : National Institute of Technology, Miyakonojo College → Tokyo university of agriculture and technology (Third-year transfer student admission) → Tokyo university of agriculture and technology, graduate school Membership : Student member of IEEE and IEICE. Link : Curriculum Vitae (PDF)
Google Scholar ResearchGate

Research Topic

『Development of spctrum awareness system towards realizing a dynamic spectrum access』

Publications

Journal

■ Hiroki Iwata, Kenta Umebayashi, Janne J. Lehtomäki, Shusuke Narieda, "Welch FFT Segment Size Selection Method for FFT Based Wide Band Spectrum Measurement," IEICE Transactions on Communications, vol.E101-B, no. 7, Jul. 2018.
Link to paper page
■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Janne J. Lehtomäki, Miguel López-Benítez, and Yasuo Suzuki, "Welch FFT Segment Size Slection Method for Spectrum Awareness System," IEICE Transactions on Communications, vol.E99-B, no. 8, Aug. 2016.
Link to paper page
■ Kenta Umebayashi, Kazuki Moriwaki, Riki Mizuchi, Hiroki Iwata, Samuli Tiiro, Janne J. Lehtomäki, Miguel López-Benítez, and Yasuo Suzuki, "Simple Primary User Signal Area Estimation for Spectrum Measurement," IEICE Transactions on Communications, vol.E99-B, no. 2, Feb. 2016.
Link to paper page

International Conference

■ Hiroki Iwata, Kenta Umebayashi, Satya Joshi, Ahmed Al-Tahmeesschi, Miguel López-Benítez and Janne J. Lehtomäki,"A Study on High-Efficiency Energy Detection-Based Spectrum Measurements," IEEE Wireless Communications and Networking Conference Workshop (WCNCW) - International Workshop on Smart Spectrum (IWSS), Seoul, South Korea, Apr. 2020 (Refereed, Accepted).
■ Hiroki Iwata, Kenta Umebayashi, "[Poster Presentation] An Efficient Noise Floor Estimation for Spectrum Measurements," International Workshop on Smart Wireless Communications (SmartCom), New Jersey, USA, Nov. 2019 (Non-Refereed).
■ Hiroki Iwata, Kenta Umebayashi, Ahmed Al-Tahmeesschi, Miguel López-Benítez and Janne J. Lehtomäki,"Time and Frequency Varying Noise Floor Estimation for Spectrum Usage Measurement," IEEE Wireless Communications and Networking Conference Workshop (WCNCW) - International Workshop on Smart Spectrum (IWSS), Marrakech, Morocco, Apr. 2019 (Refereed).
IEEE Xplore
■ Hiroki Iwata, Kenta Umebayashi, Ahmed Al-Tahmeesschi, Miguel López-Benítez, "Neural Network-based Channel Occupancy Rate Prediction," International Workshop on Smart Wireless Communications (SmartCom), Bangkok, Thailand, Oct. 2018 (Non-Refereed).
■ Hiroki Iwata, Kenta Umebayashi, Janne J. Lehtomäki, Miguel López-Benítez and Shusuke Narieda, "[Poster] Development of a smart specrum access prototype," European Conference on Networks and Communications (EuCNC), Oulu, Finland, June 2017 (Refereed).
■ Kenta Umebayashi, Hiroki Iwata, Janne J. Lehtomäki and Miguel López-Benítez, "Study on Simple Signal Area Estimation for Efficient Spectrum Measurements," European Conference on Networks and Communications (EuCNC), Oulu, Finland, June 2017 (Refereed).
IEEE Xplore
■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Janne J. Lehtomäki, and Yasuo Suzuki, "A study on Welch FFT segment size selection method for spectrum awareness," IEEE Wireless Communications and Networking Conference Workshop (WCNCW) - International Workshop on Smart Spectrum (IWSS), Doha, Qatar, Apr. 2016 (Refereed). 【Best paper award】
IEEE Xplore
■ Kenta Umebayashi, Riki Mizuchi, Hiroki Iwata, Kazuhiro Hayashi, Masanao Kobayashi, Samuli Tiiro, Yoshitaka Tamaki, Tatsuya Maruyama, Janne J. Lehtomäki, Miguel López-Benítez and Yasuo Suzuki, "Spectrum awareness system prototype for smart spectrum access," Technology Exhibit at International Workshop on Smart Wireless Communications (SmartCom), Tokyo, Japan, Oct. 2015 (Non-Refereed).
■ Hiroki Iwata, Kenta Umebayashi, Samuli Tiiro, Yasuo Suzuki, and Janne J. Lehtomäki, "Optimum welch FFT segment size for duty cycle estimation in spectrum awareness system," IEEE Wireless Communications and Networking Conference Workshop (WCNCW) - International Workshop on Smart Spectrum (IWSS), New Orleans, USA, Mar. 2015 (Refereed).
IEEE Xplore
■ Hiroki Iwata, Kenta Umebayashi, Riki Mizuchi, Tatsuya Maruyama, Kazuki Moriwaki, Samuli Tiiro, Janne J. Lehtomäki, and Yasuo Suzuki, "Development of a measurement system for spectrum awareness -- Duty estimation based on Welch-FFT --," Technology Exhibit at International Workshop on Smart Wireless Communications (SmartCom), Singapore, Oct. 2014 (Non-Refereed).

Domestic Conference

■ 岩田大輝, 梅林健太, "SNR推定を伴う電力検出閾値の設定に関する一検討",電子情報通信学会技術報告, vol. 119, no. 325, SR2019-102, pp. 75-82, Dec. 2019.
■ 岩田大輝, Ahmed Al-Tahmeesschi, 梅林健太, "[依頼講演]　ダイナミック周波数共用のための周波数利用観測システムの開発",超知性ネットワーキングに関する分野横断型研究会（RISING）, Dec. 2019.
■ 笠原芳樹, 岩田大輝, Ahmed Al-Tahmeesschi, 梅林健太, "[ポスター講演]状態判定に基づいた再帰型ニューラルネットワークを用いた周波数利用率予測の一検討",超知性ネットワーキングに関する分野横断型研究会（RISING）, Dec. 2019.
■ 大川航平, 岩田大輝, 梅林健太, Janne Lehtomäki, Miguel López-Benítez, Satya Joshi, "Duty CycleのARモデル化に関する一検討",電子情報通信学会技術報告, vol. 119, no. 109, SR2019-29, pp. 59-64, Jul. 2019.
■ 岩田大輝, 梅林健太, "［技術展示］スマートスペクトラムアクセスのための協調型周波数利用観測システムプロトタイプの開発",電子情報通信学会技術報告, vol. 119, no. 62, SR2019-16, pp. 97-103, May. 2019.
■ 岩田大輝, 梅林健太, 佐藤遼, 山田健斗, 大川航平, 笠原芳樹, Janne Lehtomäki, Miguel López-Benítez, "［技術展示］スマートスペクトラムアクセスのための周波数利用観測システムプロトタイプの開発 ~周波数利用率の予測 ~", 電子情報通信学会技術報告, vol. 118, no. 58, SR2018-17, pp. 99-106, 東京, May 2018.
■ 岩田大輝, 梅林健太, Janne Lehtomäki, Miguel López-Benítez, "周波数利用観測のための時間-周波数変動するノイズフロア推定法", 電子情報通信学会技術報告, vol. 117, no. 410, SR2017-101, pp. 43-50, 福岡, Jan. 2018.
■ 岩田大輝, 梅林健太, 玉木義孝, 長大樹, 佐藤遼, 成枝秀介, "［技術展示］スマートスペクトラムアクセスプロトタイプの開発", 電子情報通信学会技術報告, vol. 117, no. 56, SR2017-16, pp. 97-104, 東京, May 2017.
■ 岩田大輝, 梅林健太, Janne J. Lehtomäki, 鈴木康夫, "周波数利用観測のための低コストなWelch FFTセグメントサイズ選択法の解析", 電子情報通信学会技術報告, vol. 115, no. 411, SR2015-72 , pp. 1-8, 長崎, Jan. 2016.
■ 岩田大輝, 梅林健太, Samuli Tiiro, Janne J. Lehtomäki, 鈴木康夫, "Duty Cycle推定に適したWelch FFTのセグメントサイズ選択法", 電子情報通信学会技術報告，vol. 114, no. 435, SR2014-110, pp. 101-108, 函館, Jan. 2015.

Thesis

■ Ph.D. thesis : High-Efficient Wideband Spectrum Measurement based on FFT for Dynamic Spectrum Access
TUAT Repositry
■ Master thesis : Low data collection cost cooperative spectrum sensing based on compressed sensing (written in Japanese)
■ Bachelor thesis : A study on high-accuracy signal detection in frequency domain for spectrum usage measurements (written in Japanese)

Overseas Research

■ University of Liverpool, UK (July 2018 - Aug. 2018 )
■ Centre for Wireless Communications, University of Oulu, Finland (Aug. 2015 - Sep. 2015, Nov. 2016)
■ University of Hawaii at Manoa, USA (Mar. 2014)

Awards

■ Best Paper Award for the 2nd international workshop on smart spectrum (IWSS) @ IEEE wireless communications and networking conference (WCNC) (Apr. 2016)
■ Excellent Paper Award for master thesis (Awarded by Department of Electrical and Electronic Engineering, Tokyo University of Agriculture and Technology, Mar. 2016)
■ Excellent Paper Award for bachelor thesis (Awarded by Department of Electrical and Electronic Engineering, Tokyo University of Agriculture and Technology, Mar. 2014)

Hobby

Soccer, Ruuning

Message

Care and diligence bring luck.