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 】

  • 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.

  • A Highly Integrated Passive Wireless Sensing System With Synchronized Data Streaming of Multiple Tags

    Tang K., Wang M., Liu M., Zhang C., Xu S., Ji S., Lai S., Yan N., Min H., Mitsugi J.

    IEEE Internet of Things Journal (IEEE Internet of Things Journal)  9 ( 17 ) 15525 - 15537 2022.09

    　View Summary

    This article introduces a highly integrated passive wireless sensing system based on the extended electronic product code (EPC) Gen2 protocol, using sensor tags and a reader to support concurrent data streams from multiple sensors. Multiple subcarrier multiple access (MSMA) is used by assigning different subcarrier frequencies to the sensor tags for backscattering so that each tag has an independent channel for communication to achieve the simultaneous streaming of multisensor data. In order to improve the subcarrier frequency accuracy and further increase the number of communication channels, this article proposes a novel method of subcarrier frequency calibration based on the Gen2 protocol. This method enables a high-accuracy clock to be generated on-chip. At the same time, this article also proposes a method based on Gen2 protocol to start a group of tags and receive real-time data in parallel. The tag chip is fabricated in a 0.18-μm CMOS process with a die size of 850μm × 850μm, and the reader prototype is built using software-defined radio equipment. The test results show that the sensing system proposed in this article can collect and recognize concurrent data streams from multiple sensor tags synchronously. The measured sensitivity of the sensor tag is -14.9 dBm with a 3-axis accelerating sensor, and the calibration accuracy of subcarrier frequency is better than ±0.385 kHz in the range of 40-640 kHz. With this accuracy, the tags can be allocated up to 78 subcarrier communication channels theoretically.

  • Fast Blind Equalizer Exploiting Statistical Features of Symbol Constellations

    Takeyama N., Mitsugi J.

    Journal of Information Processing (Journal of Information Processing)  30   909 - 916 2022

    　View Summary

    This paper proposes a fast blind equalization algorithm realized by equating the higher-order statistics of transmitted and received signals’ IQ constellations over wireless channels. The idea is motivated by the fact that the transmitter and the receiver usually pre-share the modulation scheme, which determines the statistical distribution of the IQ constellation. Conventional blind equalizer algorithms are not practical because these optimize the equalizer coefficients with the gradient descent method demanding from hundreds to thousands of iterations to converge. This paper proposes a dimensionless loss function that can be extended to various modulation schemes and applies the Levenberg-Marquardt (LM) algorithm to regularize the Hessian matrix of the loss function automatically. This regu-larization compensates the singularity of the Hessian matrix which enables fast equalizing. The proposed method is evaluated in a MATLAB simulation to reveal that the algorithm can converge within dozens of iterations, achieving about a hundred times faster convergence and about a 30 times faster computation time than conventional blind equalization. The evaluation also reveals that the cause of the singularity of the Hessian matrix is the eigenvector space of equalizer coefficients which works to amplify inter-symbol-interference.

  • A novel method to improve the subcarrier frequency accuracy for UHF RFID sensing system

    Tang K., Zhang C., Wang M., Xu S., Ji S., Yan N., Min H., Mitsugi J.

    2021 15th Annual IEEE International Conference on RFID, RFID 2021 (2021 15th Annual IEEE International Conference on RFID, RFID 2021)   2021.04

    ISSN  9781665440905

    　View Summary

    This paper presents a novel method to improve the subcarrier frequency accuracy of tag chip for UHF RFID sensing system based on EPC global Gen2 protocol. By changing the tag's response to the Write command, the tag returns the subcarrier before returning the response specified in the protocol. In this way, a frequency calibration loop will be established between reader and tag. This method not only enables a low-power oscillator with a precise frequency to be integrated into a tag chip, but also enables flexible configuration of the frequency. The tag chip containing this idea is fabricated in SMIC 0.18 μm CMOS process with a die size of 850 μm × 850 μm. Measurement results show that the proposed novel method can realize the calibration of the subcarrier frequency, and the subcarrier frequency deviation is less than ±0.385KHz in the range of 40KHz-640KHz. With this accuracy, the tag can be allocated up to 78 subcarrier communication channels.

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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 】

  • 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

  • 第73期(1995) 優秀講演表彰

    三次　仁, 1995, Japan Society for Mechanical Engineers

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Courses Taught 【 Display / hide 】

  • SEMINAR A

    2024

  • MOBILE NETWORK

    2024

  • MASTER SEMINAR

    2024

  • INDEPENDENT RESEARCH

    2024

  • GRADUATION PROJECT 2

    2024

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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

    構成員, 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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