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 】

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

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

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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 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.

  • Concurrent backscatter streaming with batteryless sensors for wireless motion capture applications

    Mitsugi J., Kawakita Y., Ichikawa H.

    IEEE Vehicular Technology Conference （IEEE Vehicular Technology Conference)  2021-April 2021.04

    ISSN  9781728189642

    　View Summary

    This paper reports the experimental verification of concurrent backscatter streaming system comprising batteryless backscatter sensors and a software defined interrogator. The backscatter sensor is composed of a newly developed Radio Frequency Integrated Circuit (RFIC) and a commodity three axis microelectro mechanical system (MEMS) accelerometer. The concurrency is realized by allocating a dedicated subcarrier to each backscatter sensor, and using novel interference rejection signal processing in the interrogator. The communication protocol bases on ISO/IEC 18000-63 protocol with the extension of channel allocation and streaming control. The prototype system is evaluated in an experiment in where three backscatter sensors are installed on three emulated robotic mechanisms for wireless motion capture. It is confirmed that over-the-air subcarrier allocation and the concurrent capture of three robotic mechanism accelerations can be done despite the 10-4 order frequency instability of RFICs.

  • Wireless Modal Testing with Multiple Battery-free Backscatter Sensors

    Mitsugi J., Tokumasu O., Kawakita Y.

    2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021 （2021 IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2021)     90 - 96 2021

    ISSN  9781665403719

    　View Summary

    This paper reports the design, implementation and the result of real-world experiment of wireless modal testing with battery-free backscatter sensors. The battery-free backscatter sensor comprises a custom radio frequency integrated circuit (RFIC), a commodity micro electro-mechanical system (MEMS) accelerometer, and an antenna. Sensor data concurrency demanded in modal analysis is realized by allocating a dedicated subcarrier to each backscatter sensor. The orchestration of wireless communications in 920 MHz based on Gen2 protocol and the wireless power supply to the backscatter sensor are performed by a software defined interrogator built on Lab-VIEW communications and USRP. We developed an over the air (OTA) subcarrier frequency allocation with a sequence of WRITE commands of Gen2 protocol, and its performance was confirmed with the experiments in an indoor radio propagation. The accuracy of the proposed wireless structural modal testing was experimentally verified by comparing with a commercial modal test system with wired accelerometers. Although the phase characteristic measurement is disturbed by the instability of the clock source of RFIC, the gain characteristics of wireless modal testing matches well with that of a commercial wired modal testing system.

  • Full duplex backscatter communication with subcarrier synchronized decimation

    Mitsugi J., Kawakita Y., Ichikawa H.

    IEEE Wireless Communications and Networking Conference, WCNC （IEEE Wireless Communications and Networking Conference, WCNC)  2021-March 2021

    ISSN  9781728195056

    　View Summary

    Backscatter communication system, such as RFID, usually establishes bilateral communication link with time-wise half-duplex. Emerging data streaming using backscatter communication with low power or even batteryless sensors demands full duplex to stop streaming while a group of sensors backscatter. This paper introduces a full duplex method in backscatter communication using a simple decimation in backscatter sensors referred to as subcarrier synchronized decimation (SSD). Numerical simulations reveal that SSD can reconstruct the original reader-to-sensor link waveform subjected to backscatter modulation sensor-to-reader link, although the proposed method inevitably produces artificial noise because of the unequal time interval decimation. The contribution of artificial noise is investigated by using a sampling jitter model. This paper also reports a prototype implementation of SSD with USRP and LabVIEW NXG combined with a commodity DPDT switch to prove the feasibility of the proposal.

  • Wireless modal analysis with backscatter sensors subjected to clock instability

    Mitsugi J., Tanaka H.

    WiSEE 2020 - 8th Annual IEEE International Conference on Wireless for Space and Extreme Environments, Proceedings （WiSEE 2020 - 8th Annual IEEE International Conference on Wireless for Space and Extreme Environments, Proceedings)     17 - 23 2020.10

    ISSN  9781728164519

    　View Summary

    This paper examines the practicality of concurrent sensor data streaming with backscatter communication applied to modal analysis, which demands accurate data synchronization among streams. The major synchronization error source in concurrent backscatter streaming system is the instability of backscatter sensor clock. Synchronization of the streams by resampling at receiver is necessary but careless implementation may produce artificial delay caused by the difference of anti-Alias filters tailored to the individual clock rates of backscatter sensors. In this paper, a set of signal processing to synchronize concurrent backscatter signals is designed and implemented in a prototype system. The prototype system comprises backscatter sensors, interrogators and modal analyzer, which takes care of the generation of transfer matrix. The signal processing in the modal analyzer features a recursive least square regression to recover instantaneous sampling rate of backscatter sensor and a zero-phase-filtering in overlap-And-Add approach. The proposal is evaluated by comparing the transfer matrices generated from the prototype system and a commercial modal analysis system where wired accelerometers are used. The experimental results show that the proposed signal processing can successfully synchronize concurrent backscatter streams by eliminating the artificial delay.

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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 】

  • 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

    2023

  • MOBILE NETWORK

    2023

  • MASTER SEMINAR

    2023

  • INDEPENDENT RESEARCH

    2023

  • GRADUATION PROJECT 2

    2023

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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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