OCHI Hiroshi

写真a

Title

Professor

Laboratory

680-4 Kawazu, Iizuka-shi, Fukuoka

Research Fields, Keywords

E-mail

E-mail address

Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 9

Citation count denotes the number of citations in papers published for a particular year.

Undergraduate Education 【 display / non-display

  • 1981.03   Nagaoka University of Technology   Faculty of Engineering   Graduated   JAPAN

Post Graduate Education 【 display / non-display

  • 1984.03  Nagaoka University of Technology  Graduate School, Division of Engineering  Master's Course  Completed  JAPAN

Degree 【 display / non-display

  • Kyushu University -  MBA  2003.03

  • Tokyo Metropolitan University -  Doctor of Engineering  1991.03

Biography in Kyutech 【 display / non-display

  • 2019.04
    -
    Now

    Kyushu Institute of TechnologyFaculty of Computer Science and Systems Engineering   Department of Computer Science and Networks   Professor  

  • 2017.04
    -
    Now

    Kyushu Institute of TechnologyAbolition organization   Research Center for Dependable Integrated Systems  

  • 2008.04
    -
    2019.03

    Kyushu Institute of TechnologyFaculty of Computer Science and Systems Engineering   Department of Computer Science and Electronics   Professor  

Academic Society Memberships 【 display / non-display

  • 2016.08
    -
    2018.12
     

    ISPACS2018 General Chair  JAPAN

Specialized Field (scientific research fund) 【 display / non-display

  • Digital Signal Processing, Wireless communication, LSI design

 

Publications (Article) 【 display / non-display

  • Convolutional Neural Network for Asynchronous Packet Parameter Identification in Dense Wi-Fi

    Muhammad Harry Bintang Pratama, Dody Ichwana Putra, Leonardo Lanante Hiroshi Ochi

    2021 IEEE International Conference on Communications Workshops, IEEE ICC 2021       2021.06  [Refereed]

  • Industrial WLAN System with Accurate Time Synchronization on Software Defined Radio

    Nguyen T.T.T., Toyofuku M., Ito Y., Ishimitsu C., Nagao Y., Kurosaki M., Ochi H.

    2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021 - Proceedings      2021.06  [Refereed]

     View Summary

    This paper presents a hardware implementation of low latency and highly accurate time synchronization for Industrial WLAN systems. The design of our media access control (MAC) layer supports both asynchronous and synchronous multi- user transmission protocols. Low overhead Packet Division Multiple Access (PDMA) scheme is utilized for Multi-user Downlink transmission, while Frequency Division Multiple Access (FDMA) is employed for the uplink transmission. The design of the physical (PHY) layer system is developed based on fast and deterministic communication. The proposed industrial WLAN system is developed on Software Defined Radio (SDR). The experimental results show that the wireless control communication can be achieved to control motors with a high accuracy Precision Time Protocol (PTP) in nano-second level from 200 ns to 300 ns which is less than 1 ms compared to PROFINET wireless standard.

    DOI Scopus

  • Cooperative MIMO Applied Null Beamforming to Self in Full-Duplex Wireless Communication System and Its Implementation

    Kawano M., Nagao Y., Lanante L., Kurosaki M., Ochi H.

    International Conference on Advanced Communication Technology, ICACT    2021-February   176 - 181   2021.02  [Refereed]

     View Summary

    This paper proposes a full-duplex wireless communication system applying cooperative multiple-input multiple-output (Co-MIMO). This proposal solves self-interference (SI) in full-duplex wireless communication systems by applying the block diagonalization used in multi-user MIMO (MU-MIMO). Therefore, there is no need for a radio frequency (RF) canceller, which has a large hardware size and is difficult to extend to MIMO. Furthermore, higher throughput can be achieved by applying Co-MIMO, in which multiple access points work together to communicate. We also introduce the implementation of the proposed method using a field-programmable gate array (FPGA) and software-defined radio (SDR) in this paper. It shows that SI cancellation can be realized by using them. The proposed method is implemented based on the IEEE 802.11n frame format as an example. In the experiment, a total of 30 [dB] SI cancellation is confirmed with a transmission power of-12 [dBm]. The SI cancellation amount can be further increased by increasing the transmission power.

    DOI Scopus

  • Null beamforming to self in cooperative MIMO for full-duplex systems

    Kawano M., Thao Nguyen T.T., Nagao Y., Lanante L., Kurosaki M., Ochi H.

    Proceedings - IEEE International Symposium on Circuits and Systems    2021-May   2021.01  [Refereed]

     View Summary

    In this paper, we propose self-interference (SI) cancellation in cooperative multiple-input multiple-output (Co-MIMO) for full-duplex (FD) wireless communication systems. This proposal solves SI by applying the block diagonalization used in multi-user MIMO. Therefore, there is no need for a radio frequency (RF) canceller, which has a large hardware (HW) size and is difficult to extend to MIMO. Furthermore, we can achieve higher throughput by applying Co-MIMO, in which multiple access points (APs) work together to communicate. The proposed method-s implementation uses field-programmable gate array (FPGA) and software-defined radio (SDR). In the experiment, a total of 33 [dB] SI can cancel with two cooperative APs and two antennas per AP in the IEEE 802.11 system.

    DOI Scopus

  • Live demonstration: Null beamforming to self in cooperative MIMO for full-duplex system

    Kawano M., Nguyen T.T.T., Nagao Y., Lanante L., Kurosaki M., Ochi H.

    Proceedings - IEEE International Symposium on Circuits and Systems    2021-May   2021.01  [Refereed]

     View Summary

    We demonstrate a self-interference (SI) cancellation in cooperative multiple-input multiple-output (Co-MIMO) for full-duplex (FD) wireless communication systems by applying the block diagonalization used in multi-user MIMO. The proposed method's implementation uses a field-programmable gate array (FPGA) and software-defined radio (SDR). In the experiment, a total of 33 [dB] SI can cancel with two cooperative APs and two antennas per AP in the IEEE 802.11 system.

    DOI Scopus

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Publications (Books) 【 display / non-display

  • シミュレーションで学ぶディジタル信号処理 第10版

    尾知 博 ( Single Work )

    CQ出版  2019.06 ISBN: 978-4-7898-2230-2

  • シミュレーションで学ぶディジタル信号処理 第7版

    尾知 博 ( Single Work )

    CQ出版  2013.07 ISBN: 978-4-7898-3320-2

Conference Prsentations (Oral, Poster) 【 display / non-display

  • 産業用無線LANシステムを用いたEtherCATのトンネリングに関する研究

    伊藤義基, 豊福瑞, Tran Thi Thao Nguyen, 長尾勇平, 黒崎正行, 尾知博

    2020年電子情報通信学会総合大会  (広島県東広島市)  2020.03  -  2020.03  電子情報通信学会

  • 小型SDRボードを用いたロボット制御のための産業用無線LANシステムの実装

    豊福瑞, 伊藤義基, Tran Thi Thao Nguyen, 長尾勇平, 黒崎正行, 尾知博

    2020年電子情報通信学会総合大会  (広島県東広島市)  2020.03  -  2020.03  電子情報通信学会

  • マルチBSS環境におけるIEEE802.11CSMA/CA性能解析モデルに関する一検討

    梶原隆平, Leonardo Jr. Lanante, 長尾勇平, 黒崎正行, 尾知博

    2020年電子情報通信学会総合大会  (広島県東広島市)  2020.03  -  2020.03  電子情報通信学会

  • Image Tampering Detection and Self-Recovery by Using Robust Digital Watermark against JPEG Compression

    Ohara S., Kurosaki M., Ochi H.

    IEICE Technical Report  (Kitakyushu, Fukuoka)  2020.03  -  2020.03  The Institute of Electronics, Information and Communication Engineers

     View Summary

    Recently, with the tremendous diffuser of smartphones, the SNS users rate has increased to 74.7 %
    in 2018. Users can easily send and receive the various images via the Internet such as SNS. In addition, image
    processing technology has been developed, making it possible to easily process images. On the other hand, with
    the development of image processing technology, images are often tampered by malicious users to be different from
    the facts and spread on SNS, which is a social problem. Digital watermark, which is a method to solve such the problems, has attracted attention. This method embeds a digital watermark directly in the image, and the receiver side extracts the digital watermark from the tampered image, which is used as a method of tamper detection and recovery of the tampered image. However, this method does not support the image format JPEG (Joint Photographic Experts Group) often used in SNS, and converting an image which is embedded digital watermark to JPEG breaks the digital watermark and does not work well. In this report, we propose the method of tampering detection and self-recovery by using robust digital watermark against JPEG compression, and evaluate its performance by software simulation.

  • High-accuracy Timing Offset Estimation Method Between Devices by Software Processing

    Nagano K., Kusunoki I., Nagao Y., Lanante L., Kurosaki M., Ochi H.

    IEICE Technical Report  (Tokyo)  2020.03  -  2020.03  The Institute of Electronics, Information and Communication Engineers

     View Summary

    Highly accurate timestamps of device's local time is required in IoT sensor networks.
    This is because the timestamp information is important for measured data analysis.
    However, the conventional high-precision time synchronization method generally requires special hardware and hence difficult to implement in small IoT devices.
    In this paper, we present a high-accuracy clock offset estimation method that achieves a maximum error of 50 ns by software processing using only ToA(Time of Arrival) information obtained by each node in a wireless LAN network.

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Lectures 【 display / non-display

  • Scalable Ultra HD Video Transmission over MIMO Wireless System

    The International Symposium on Multimedia and Communications (ISMAC 2019) ( Quezon, Phillippine )  2019.08.20  IEEE

  • Fast and Secure Industry Wireless LAN

    The 6th IEEE International Conference on Communication, Networks and Satellite   2017.10.05 

  • World's First High Speed, High Reliability, High Safety Industrial WLAN System

    The 2017 International Conference on Embedded Systems and Intelligent Technology   2017.08.03 

  • Up-Link Multi-User MIMO system Design

    2015 INHA SSE-ITRC   2015.03.30 

  • IEEE 802.11 MAC Layer Design

    2015 INHA SSE-ITRC   2015.03.30  INHA University

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Other External Funds 【 display / non-display

  • Digital Cinema Transmission by using Wirelss Mesh Networks

    Offer organization:  Ministry of Education, Culture, Sports, Science and Technology 

    Project Year:  2007.04  -  2011.03

 

Activities of Academic societies and Committees 【 display / non-display

  • 2017.11
     
     

    The Institute of Electrical and Electronics Engineers, Inc.  

  • 2017.10
     
     

    The Institute of Electrical and Electronics Engineers, Inc.  

  • 2015.10
     
     

    The Institute of Electrical and Electronics Engineers, Inc.  

  • 2013.09
    -
    2015.03

    The Institute of Electrical and Electronics Engineers, Inc.   General Chair of APCCAS2014