Mitsugi, Jin



Faculty of Environment and Information Studies (Shonan Fujisawa)



E-mail Address

E-mail address

Related Websites

Career 【 Display / hide

  • 1987.04

    Nippon Telegraph and Telephone Corporation

  • 2004.04

    NTT Communications

  • 2004.04


Academic Background 【 Display / hide

  • 1985

    Nagoya University, Faculty of Engineering, Aerospace Engineering

    Nagoya, University, Graduated

  • 1987

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

    Tokyo, Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide

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


Research Areas 【 Display / hide

  • Dynamics/Control (Machine Mechanics/Control)

  • Communication/Network engineering (Communication/Network Engineering)

Research Keywords 【 Display / hide

  • Mechatronics

  • RFID

  • Wireless communications

  • Computational Engineering

Research Themes 【 Display / hide

  • Architecture of networked RFID, 


     View Summary

    System architecture design of network RFID system.

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


Papers 【 Display / hide

  • Channel Reservation by Even-odd Separation in Multiple Subcarrier Multiple Access

    Takahashi K., Takazawa Y., Kamei H., Mitsugi J., Ichikawa H., Kawakita Y.

    2019 12th International Conference on Mobile Computing and Ubiquitous Network, ICMU 2019 (2019 12th International Conference on Mobile Computing and Ubiquitous Network, ICMU 2019)   2019.11

    ISSN  9784907626419

     View Summary

    © 2019 IPSJ. Authors propose a method for improving channel reservations in multi-subcarrier multiple-access wireless communications schemes. This scheme is designed for use with wide-area synchronous sensing zones that use functionally extended multi-subcarrier multiple-access subcarrier communication schemes for passive radio-frequency identification (RFID). When the sensing target is larger than the communication distance of the sensor, the sensing zone must be divided. Overlapping zones invariably occur in this case. Sensors in overlapping zones transmit signals to their respective receivers over the same channels and interference follows. If three or more zones are placed side by side, middle zone's communication capacity is lower than else zones. Because, middle zone can not use nearly center frequency. However, the communication capacity and its variations have not been examined for how they are affected by the zones in which overlapping sensors are used. This study investigated communications between sensors in overlapping zones by assigning channels to receivers in odd zones. The channel reservation method and the conventional method were simulated in MATLAB an compared. By allocating channels to sensors in odd zones, communication capacity can be improved and variations suppressed.

  • Statistical carrier phase recovery for narrow-band backscatter wireless link

    Sato Y., Mitsugi J., Kawakita Y., Ichikawa H.

    Proceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019 (Proceedings of 2019 25th Asia-Pacific Conference on Communications, APCC 2019)     142 - 147 2019.11

    ISSN  9781728136790

     View Summary

    © 2019 IEEE. This paper proposes a carrier recovery method tailored to narrow-band multicarrier backscatter wireless links, which employ subcarrier modulation. Because backscattered subcarrier is usually produced by low accuracy and low rate internal clock in a low power consumption or batteryless, wireless sensor, the corresponding receiver needs to compensate the subcarrier frequency drift and fluctuation dynamically for demodulation and decoding. Although a backscattered subcarrier is produced by changing the antenna reflection coefficient of wireless sensor, the backscattered signal is usually converted to a zero-crossing signal to enhance signal resolution, and edge detection based demodulator is applied at the receiver. However, in a multicarrier backscatter system, the edges at symbol boundaries of each backscattered subcarrier become indistinct because of the narrow bandwidth. Consequently, subcarrier frequency estimation with existing carrier recovery technique may results in error. This paper solves the problem by removing outliers of temporal subcarrier frequency based on the statistical distribution and applying a feedback control. The statistical carrier recovery method is examined experimentally with a prototype wireless sensor and a software defined receiver to reveal the method can automatically compensate unstable subcarrier with about 10-2 order drift and outperforms the popular frequency doubler based carrier recovery. The optimal feedback gain, 1.0, is also revealed.

  • Real-time separation of collided signals in multiple zones backscatter communication system

    Mitsugi J., Kamei H., Kawakita Y., Ichikawa H.

    7th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2019 - Conference Proceedings (7th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2019 - Conference Proceedings)     87 - 92 2019.10

    ISSN  9781728121406

     View Summary

    © 2019 IEEE. Backscatter communication is essential in applications where wireless and batteryless sensors are demanded. Backscatter communication system may suffer short communication range because its sensors transmit signals by means of the reflection of incident radio wave that is provided by counterpart interrogator. The use of multiple interrogators, forming multiple interrogation zones, is the usual practice to extend the range of backscatter communication system. However, if a sensor receives more than one radio waves-one from its counterpart interrogator and others from neighbor interrogators-the sensor produces modulated backscatters to all the interrogators, causing interference to neighbor interrogators. This inter-zone interference is particularly problematic when multiple sensors send stream data concurrently. This paper proposes a real-time separation of collided backscatter signals based on their statistical independence. The proposal uses a priori probability of backscatter signal to extract the independent carrier phase angles and the independent amplitudes from IQ signal observation. The measurement of channel state information with predefined symbol pattern in packet is not needed. The proposal is evaluated both in numerical simulations and a physical experiment using prototype backscatter sensors and a software-defined interrogator. The results show that collided backscatter signals can be separated in real-time without degrading the packet error rate of each signal.

  • Frequency Efficient Concurrent Data Streaming with Passive Backscatter Wireless Sensors

    Kamei H., Sato Y., Mitsugi J., Egawa K., Kawakita Y., Ichikawa H.

    2018 6th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2018 (2018 6th IEEE International Conference on Wireless for Space and Extreme Environments, WiSEE 2018)     107 - 109 2019.02

    ISSN  9781538642443

     View Summary

    © 2018 IEEE. This poster presentation introduces a multi-subcarrier passive backscatter wireless communication which enables frequency efficient and perfectly synchronized sensor data streaming. The inevitable mutual interferences among sub-carriers are actively rejected with a sophisticated digital signal processing in the receiver. The performance of the method, in terms of the synchronization and the interference processing gain, are experimentally evaluated with two types of prototype sensors and a software defined receiver realized with USRP 2952R and LabVIEW communications. The results show that the proposed interference rejection method works both for analog and digital modulation.

  • GNU radio-based cloud development environment for software-defined radio users

    Suzuki H., Ichikawa H., Mitsugi J., Kawakita Y.

    Journal of Information Processing (Journal of Information Processing)  27   287 - 296 2019

    ISSN  03875806

     View Summary

    © 2019 Information Processing Society of Japan. Software-defined radio (SDR) is used for R&D such as cognitive radio. Because sampling devices and personal computers configuring the SDR environment have fixed configurations, some reconfiguration is needed when the SDR application requires different data sources and computational resources. To enable reconfiguration, we present a cloud platform that has scalable computing resources and data sources deployed over a wide area. We use the existing SDR development environment (SDRDE) and implement it on the cloud platform. It is necessary to transfer the SDR environment to the cloud by separating the UI and data management from the existing SDRDE. In this study, we selected the GNU Radio Companion (GRC) as the base platform and implemented an SDRDE for an unspecified number of users by separating the UI. In addition, we used task parallel and distributed computing for the SDR application. In this study, we focus on compatibility with the base implementation and lifting the limits of computational resources. We confirmed the compatibility with GRC in terms of user skill sets and software assets and evaluated the system response time. Further, the relationship between CPU utilization and instructions per cycle during SDR application execution shows that in general, this approach is effective.

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

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

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


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 三次 仁, 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


    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


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 三次 仁, 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


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

  • センサLSIによるバッテリレス・ワイヤレス非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研究開発


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

  • 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 Awards

  • 第73期(1995) 優秀講演表彰

    三次 仁, 1995, Japan Society for Mechanical Engineers


Courses Taught 【 Display / hide











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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

  • 衛星通信技術の普及に関する検討会

  • 超高速衛星の技術力強化のための調査検討会

  • 920MHz電子タグ調査検討会

  • GS1 EPCglobal


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Memberships in Academic Societies 【 Display / hide

  • 電子情報通信学会, 

  • Japan Association of Mechanical Engineers, 


Committee Experiences 【 Display / hide

  • 2019.04

    構成員, 総務省 情報通信審議会陸上無線通信委員会

  • 2017

    Associate Editor, IEEE Journal of RFID

  • 2015

    Associate Editor, IEEE Transactions on Automation Science and Engineering

  • 2015

    Associate Editor, IEEE Internet of Things Journal

  • 2013.02

    座長, 衛星通信技術の普及に関する検討会

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