Mitsugi, Jin

写真a

Affiliation

Faculty of Environment and Information Studies (Shonan Fujisawa)

Position

Professor

Related Websites
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Career 【 Display / hide 】

  • 1987.04
    -
    2004.03

    Nippon Telegraph and Telephone Corporation

  • 2004.04
    -
    2008.03

    NTT Communications

  • 2004.04
    -
    Present

    現職

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Academic Background 【 Display / hide 】

  • 1985

    Nagoya University, Faculty of Engineering, Aerospace Engineering

    University, Graduated

  • 1987

    The University of Tokyo, Graduate School, Division of Engineering, Aerospace Engineering

    Graduate School, Completed, Master's course

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Academic Degrees 【 Display / hide 】

  • Dr.Eng., The University of Tokyo, Dissertation, 1996

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering (Communication/Network Engineering)

  • Informatics / Mechanics and mechatronics (Machine Mechanics/Control)

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Research Keywords 【 Display / hide 】

  • Mechatronics

  • RFID

  • Wireless communications

  • Computational Engineering

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Research Themes 【 Display / hide 】

  • Architecture of networked RFID, 

    　

    　View Summary

    System architecture design of network RFID system.

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Proposed Theme of Joint Research 【 Display / hide 】

  • network RFID

    Interested in joint research with industry (including private organizations, etc.),  Desired form： Cooperative Research

  • Wireless Sensor Network

    Interested in joint research with industry (including private organizations, etc.),  Desired form： Cooperative Research

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Papers 【 Display / hide 】

  • A low power all-digital frequency locked loop with resource-efficient frequency detector and hysteresis lock detector

    Zhao Y., Mitsugi J., Min H.

    IEICE Electronics Express 21 ( 20 )  2024

    ISSN  13492543

    　View Summary

    Trillions of Internet of Things devices require rigorous design trade-offs regarding size, cost, and energy efficiency, leading to design challenges for clock modules. This paper proposes a low-power all-digital frequency locked loop (ADFLL) featuring a digital frequency detector with minimum D-type flip-flop usage and a lock detector with hysteresis lock/unlock decision zone, suitable for system-on-chip applications. The ADFLL is verified in the field-programmable gate arrays (FPGA) and is implemented as an on-chip clock generator in a radio frequency identification tag using 130 nm CMOS technology with 0.185 × 0.26 mm2 size. The generated clock has ±0.25% frequency accuracy with good temperature and process robustness.

  • Accurate Phase Angle Measurement of Backscatter Signal under Noisy Environment

    Iwasaki T., Tokumasu O., Mitsugi J.

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences)  E106A ( 3 ) 464 - 470 2023.03

    ISSN  09168508

    　View Summary

    Backscatter communication is an emerging wireless access technology to realize ultra-low power terminals exploiting the modulated reflection of incident radio wave. This paper proposes a method to measure the phase angle of backscatter link using principal component analysis (PCA). The phase angle measurement of backscatter link at the receiver is essential to maximize the signal quality for subsequent demodulation and to measure the distance and the angle of arrival. The drawback of popular phase angle measurement with naive phase averaging and linear regression analysis is to produce erroneous phase angle, where the phase angle is close to ±π 2 radian and the signal quality is poor. The advantage of the proposal is quantified with a computer simulation, a conducted experiment and radio propagation experiments.

  • Two-Stage Harmonics Rejection in FDMA Backscatter Communication System Using FFT Filterbank

    Mitsugi J., Tokumasu O., Sakabe H.

    IEEE Journal of Radio Frequency Identification (IEEE Journal of Radio Frequency Identification)  7   518 - 527 2023

    　View Summary

    This paper presents a harmonics rejection method for the sensor-to-interrogator link of frequency division multiple access (FDMA) backscatter communication system exploiting an FFT filterbank. It is well known that backscatter signals produce undesired outband emissions and harmonics because of the absence of a pulse shaping filter. Harmonics, produced by introducing subcarrier coding, are particularly problematic because they interfere with particular frequency channels. The proposed method features the generation of harmonics replicas from the baseband signal in an allocated channel produced by a FFT filterbank. The generation of a harmonics replica from the baseband signal demands a delicate handling of the carrier and the subcarrier phases. This paper presents this problem and proposes a two-stage harmonics replica generation exploiting the statistical independence among the interfering and interfered baseband signals. The proposal was implemented in a software defined interrogator, and was evaluated with a wired experiment with various carrier-to-interference ratios and two real-world wireless propagation experiments using prototype battery-free backscatter sensors. These evaluations revealed that the proposed harmonic rejection method could deliver about 6 dB of processing gain.

  • Fractional Delayed Detection For Unstable Subcarrier-Coded Backscatter Link

    Zhao Z., Mitsugi J.

    2023 IEEE 13th International Conference on RFID Technology and Applications, RFID-TA 2023 - Proceedings    253 - 256 2023

    　View Summary

    This paper proposes a carrier recovery method for subcarrier-coded backscatter links using a fractional, less than one-symbol, delayed detection. The fractional delayed detection extends the permissible subcarrier frequency errors but results in an unbalanced distribution of delayed symbols. This paper reveals the contribution of fractional detection in RFID sensing systems, particularly the system with an FDMA backscatter to collect streaming data. The unbalanced symbol distribution problem is resolved using a principal component analysis (PCA) of delayed symbols. The fractional delayed detection was evaluated both with a MATLAB simulation and a combination of a software-defined interrogator and a prototype wireless sensor. Both evaluations showed the effectiveness of the proposal.

  • MSN: Battery-Less Multiple Subcarrier Multiple Access Sensor Node with Full-Duplex Backscatter Concurrent Data Streaming

    Zhao Y., Wang H., Xu Y., Ying Z., Lu Y., Liu J., Hu T., Mitsugi J., Min H.

    2023 IEEE Asian Solid-State Circuits Conference, A-SSCC 2023  2023

    　View Summary

    To scale to trillions of Internet-of-Things (loT) nodes, devices must be battery-less by achieving energy autonomy, having a μW power floor, few off-chip components, and a small form factor. These features are beneficial for short-range high-density loT applications such as structural health monitoring (SHM) for wings and gears, human motion capture (HMC), and air conditioning system monitoring. This work focuses on the synchronous transmission of sensor data streams, called concurrent data streaming, from multiple sensor nodes for multi-points sensing. Traditional wireless communication protocols need construct wireless networks for time synchronization, increasing system complexity [1]. However, the recent development of Multiple Subcarrier Multiple Access (MSMA), enables concurrent backscatter communication by assigning multiple uplink subcarrier (USC) channels to sensor nodes [2]-[4]. To expand the deployment in the mentioned loT applications, MSMA should be compatible with existing communication protocols and achieve real-time control of starting and stopping of concurrent data streaming without wasting extra sensing system energy. To avoid channel interference among multiple nodes and catastrophic failure of concurrent data transmission, the USC frequency must always keep stable from the influence of PVT.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Presentations 【 Display / hide 】

  • Guest Editorial

    Zhou Meng Chu, Fortino Giancarlo, Shen Weiming, Mitsugi Jin, Jobin James, Bhattacharyya Rahul

    IEEE Transactions on Automation Science and Engineering, 

    2016.07

  • Improvement in multiple access channel allocation for sensor node configuration based on RFID communication

    Matsuda Tomoaki, Wakisaka Yuuki, Kawakita Yuusuke, Ichiakwa Haruhisa, Mitsugi Jin

    RFID, 

    2016.01
    , 

    IEEE

    　View Summary

    <p>Wireless sensors are expected to be low cost and to reduce their power consumption so that a large number of sensors can be installed for collecting real-world information. Passive radio-frequency identification (RFID) is proposed to assign communication channels to sensors that only send analog sensing signals for their multiple access control. In this method, the RFID reader-writer assigns channels to all sensors by writing channel numbers to the RFIDs attached to the sensors. We propose a method that more efficiently assigns a multiple access channel to the controlled sensor by using passive RFID. We determine the channel by using the electronic product code (EPC) of the RF tags. This approach results in a large reduction in the number of writes. However, it is shown that there is a tradeoff between the reduction in the number of writes and the total number of channels. In addition, our method has a tradeoff between the reduction in the number of writes and the spectral efficiency.</p>

  • A feasibility study of plug-in type RF tag localization system for handheld UHF RFID reader/writers

    Miyazawa Masato, Igarashi Yuki, Mitsugi Jin

    2015.10
    , 

    Oral presentation (general)

    　View Summary

    <p>This paper proposes a plug-in type RF tag localization system, using an Angle of Arrival principle, in UHF RFID, particularly targeting handheld reader/writers. Being a plug-in type, the RF tag localization system is receive-only, incurring no radio license requirement, small in size and can be built at low cost. Our fundamental idea is to employ a newly developed short-range mono-pulse method for the RF tag direction detection enabled with affordable software defined radio device and an analog front end. In this paper, we report an experimental evaluation with a functional prototype primarily on the detecting accuracy. It is shown that we can achieve about 3 degree accuracy for RF tags at 7.3 m distance from a 4 W EIRP reader/writer. Because the measurement in the direction of boresight is more stable than the other directions, the direction accuracy can be improved when we feed back the direction detection to the orientation of handheld reader/writer. We also confirm this feature experimentally.</p>

  • Boxcan

    Sato Yuki, Sato Taisuke, Mitsugi Jin

    APCC, 

    2015.10
    , 

    Oral presentation (general), IEICE

    　View Summary

    <p>This paper introduces «Boxcan», an information retrieval platform for aggregated objects in ID-based object management system based on GS1 EPCglobal architecture framework. Boxcan platform receives an EPC of a container, then provides a tree structure of current parent-child relationship between the EPCs of the container and its inner objects. This paper proposes the system design of Boxcan platform and its applications. The proposed system design is evaluated with a field test of a practical object management system including Boxcan platform. A technical challenge to realize this function of Boxcan platform, fast retrieval of current parent-child relationship of EPCs from EPCIS, is also discussed in this paper. The effectiveness of the caching mechanism of EPC's current parent-child tree, which is a solution to this technical problem, is also evaluated by an experiment in a comparison with direct querying to EPCIS.</p>

  • Multi-code filtering &amp; collection

    Mizutani Iori, Mitsugi Jin, Endo Fumihiko, Ehara Masaki, Suzuki Hiroyuki

    IEEE RFID-TA 2015, 

    2015.09
    , 

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 同期・多数接続信号処理を可能とするバックスキャッタ通信技術の研究開発

    2020.09
    -
    2024.03

    総務省, 電波資源拡大のための研究開発, No Setting

  • Plug-in localization system using multiple commercial-off-the-shelf software defined receivers

    2019.04
    -
    2022.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

  • バッテリレス・ワイヤレス完全同期ストリーム通信を実現するマルチサブキャリア多元接続方式の高信頼化と広域化

    2018.07
    -
    2020.03

    総務省　, Strategic Information and Communications R&D Promotion Programme (SCOPE), Principal investigator

  • 電波伝播特徴量を用いたRFID読み取り空間フィルタの実現

    2016.04
    -
    2019.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • 電波伝搬特徴量を用いたＲＦＩＤ読み取り空間フィルタの実現

    2016
    -
    2018

    JSPS, Grant-in-Aid for Scientific Research, Principal investigator

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Awards 【 Display / hide 】

  • CEATEC 2024 Next Generation部門賞

    Backscatter Communication Research Consortium, Keio University, 2024.10, CEATEC 2024 , Concurrent Multichannel Battery-free Wireless Sensing System

    Type of Award： Award from publisher, newspaper, foundation, etc.

  • SCOPE成果展開推進賞

    2024.01, 総務省, バッテリレス・ワイヤレス完全同期ストリーム通信を実現するマルチサブキャリア多元接続方式の高信頼化と広域化

  • 電波技術協会賞

    2023.11, 電波技術協会, ネットワーク型RFIDタグや電池不要のRFIDセンサを開発しRFIDタグの実用化と普及に貢献

    Type of Award： Award from publisher, newspaper, foundation, etc.

  • 功労賞

    MITSUGI JIN, 2005, 電子情報通信学会

    Type of Award： Other

  • 優秀講演表彰

    MITSUGI JIN, 1995, 日本機械学会計算工学部門

    Type of Award： Other

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Courses Taught 【 Display / hide 】

  • SEMINAR A

    2025

  • MOBILE NETWORK

    2025

  • MASTER SEMINAR

    2025

  • INDEPENDENT RESEARCH

    2025

  • GRADUATION PROJECT 2

    2025

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Social Activities 【 Display / hide 】

  • 920MHz帯センター無線システムの周波数共用技術に関する調査研究会

    2013.09
    -
    2014.03

  • 衛星通信技術の普及に関する検討会

    2013.02
    -
    2013.03

  • 超高速衛星の技術力強化のための調査検討会

    2011.09
    -
    2012.03

  • 920MHz電子タグ調査検討会

    2011.07
    -
    2012.03

  • GS1 EPCglobal

    2010.04
    -
    2011.03

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Memberships in Academic Societies 【 Display / hide 】

  • 電子情報通信学会, 

    2011.04
    -
    Present

  • Japan Association of Mechanical Engineers, 

    2005
    -
    Present
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Committee Experiences 【 Display / hide 】

  • 2021.02
    -
    Present

    構成員, 総務省　情報通信審議会衛星通信システム委員会

  • 2019.04
    -
    Present

    座長, 総務省　情報通信審議会陸上無線通信委員会

  • 2017
    -
    Present

    Associate Editor, IEEE Journal of RFID

  • 2015
    -
    2018

    Associate Editor, IEEE Transactions on Automation Science and Engineering

  • 2015
    -
    2018

    Associate Editor, IEEE Internet of Things Journal

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