劉　江 (リュウ　コウ)

写真a

所属

理工学術院 国際理工学センター（理工学術院）

職名

准教授
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兼担 【 表示 ／ 非表示 】

  • 理工学術院   大学院基幹理工学研究科

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学内研究所等 【 表示 ／ 非表示 】

  • 2020年
    -
    2022年

    理工学術院総合研究所   兼任研究員

  • 2020年
    -
    2022年

    国際情報通信研究センター   兼任研究員

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学歴 【 表示 ／ 非表示 】

  • 2006年04月
    -
    2012年03月

    早稲田大学   国際情報通信研究科 博士課程  

  • 2004年04月
    -
    2006年03月

    早稲田大学   国際情報通信研究科 修士課程   通信  

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学位 【 表示 ／ 非表示 】

  • 早稲田大学   博士学位（国際情報通信）

  • 早稲田大学   修士学位(国際情報通信学)

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経歴 【 表示 ／ 非表示 】

  • 2017年09月
    -
    継続中

    早稲田大学   理工学術院 国際理工学センター CSCEメジャー   准教授

  • 2014年04月
    -
    2017年08月

    早稲田大学   国際教育センター   講師

  • 2012年04月
    -
    2014年03月

    早稲田大学   理工学術院総合研究所   次席研究員

  • 2009年04月
    -
    2012年03月

    早稲田大学   国際情報通信研究科   助手

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所属学協会 【 表示 ／ 非表示 】

  • 　
    　
    　

    IET

  • 　
    　
    　

    IEEE

  • 　
    　
    　

    電子情報通信学会

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研究分野 【 表示 ／ 非表示 】

  • 情報ネットワーク

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研究キーワード 【 表示 ／ 非表示 】

  • 無線通信, 光通信

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論文 【 表示 ／ 非表示 】

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共同研究・競争的資金等の研究課題 【 表示 ／ 非表示 】

  • 超低遅延、高信頼ワイヤレスアクセス方式の提案及びその評価

    研究期間:

    2019年04月
    -
    2022年03月
     

    　概要を見る

    ２足歩行ロボット等の開発が進み具体的なUSE CASEも出てきている状況ではあるが、現状ではその設計には各種の制限があり、本格的な利用には解決すべき課題がいくつか存在する。そのうちの一つがハーネスの問題である。研究ではそのようなハーネスを無線化することで、それらの課題の解決を図るものである。元々有線接続であったものを無線化することになるので、品質としては無線でありながら有線の品質や遅延、信頼性が求められる。研究では超低遅延、超高信頼を実現する無線通信方式の開発と、電力伝送方式を開発し、自由度と信頼性の高いロボット構築技術の確立を目指す

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講演・口頭発表等 【 表示 ／ 非表示 】

  • An Optical IM/DD Based Spatial Transmission Diversity Achievable Relay Scheme

    IEEE Wireless Communications & Networking Conference (WCNC) 2009  

    発表年月： 2009年04月

  • An Optical IM/DD Channel Based Relay Scheme for Indoor Healthcare Communication System

    IEEE Consumer Communications and Networking Conference (CCNC) 2009  

    発表年月： 2009年01月

  • A Study on RF Signal Relay System employing Optical Wireless Communication

    Technical Committee on Optical Communication Systems (OCS) Conference, Japan  

    発表年月： 2008年10月

  • Long Distance Optical Wireless Network Employing Multiple Access Scheme

    GLOBECOM '07. IEEE  

    発表年月： 2007年11月

  • A Proposal of Interference Cancellation Scheme Based on IQ-Balanced Transmission

    2006 IEICE General Conference  

    発表年月： 2006年03月

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特定課題研究 【 表示 ／ 非表示 】

  • Non-invasive Healthcare Monitoring System using Wireless Technologies

    2019年  

    　概要を見る

    Diseases such as diabetes, hypertension, etc. are progressing without the patient’s awareness. Without the early noticeable symptoms, a lot of people missed the opportunities in early diagnosis. A system that can provide vital data acquirement, analysis, and management support is desired. As the first step of our final target, in this academic year, the non-contact pulse, blood pressure, and glucose monitoring system are studies. The following works have been conducted1)    Non-contact pulse and blood pressure acquisition systemIn this research, a non-contact pulse and blood pressure monitoring system is designed. The frequencies used in this experiment are 28GHz and 32GHz, which are the same as 5G millimeter-wave signal. In the experiment, the relationship between the value of blood pressure and the shape of the waveform is analyzed. The experiment results have shown that the pulse and blood pressure can be detected by using millimeter waves. 2)  Glucose acquisition systemAmong various NGM technologies, infrared is considered as the most popular and prospective method. In this research, the mid-infrared spectroscope is used in the experiment. The association between mid-infrared transmittance and blood glucose concentration is studied. It is found that the infrared with a peak wavelength of 3333 ~2857 nm is a good solution for glucose measurement.

  • Non-invasive Monitoring System for Ubiquitous Healthcare using Optical Wireless Technologies

    2018年  

    　概要を見る

    The aging population and a lack of recourses such asworkers, places in Japan become a serious concern. Miniature body sensors canperform long-term and ambulatory health monitoring, such as heart rate andblood pressure monitoring. However, technology, healthcare, and easy userinterface have not yet been collaborating deeply and much research is underway.This research uses light sensing to acquire biological information such asSpO2, blood pressure via a non-invasive approach. In this research, a cheap,easy to use, and low power consumption device prototype used to obtain SpO2related information is designed. The proper light wavelength for light sensingin our device is discussed and related experiments are carried out and the datais analyzed. The experiment and data analyzing results show that the proposedSpO2 evaluation method is useful and practical. In future work, the bloodpressure data processing method will be studied.

  • Indoor Positioning System Utilizing Visible Light Communication

    2017年  

    　概要を見る

    Indoor positioning system has gaining lots of attention forindoor navigation recently since the GlobalPositioning System (GPS) hasvery low accuracy indoor. In the same time, Light-emitting Diodes (LEDs) havebecome the future generation of light source over the traditional one becauseof its various promising advantages such as low energy consumption,environmental friendliness, high luminous efficiency, low cost etc. Thisproject studied a positioningsystem utilizing Visible Light Communication (VLC). There are several otherexisting technologies which have been studied and used for indoor position suchas ultrasound, magnetic, Wi-Fi, Blue tooth technology and so on. However, thereare still have some problems related to the accuracy and high cost. In thisproject, an indoor positioning system using VLC is proposed. It provides higherposition accuracy within centimeter in low cost. Received Signal StrengthIndicator (RSSI) algorithm is used to estimate the coordination of the receiver.The position accuracy is analyzed by using a derived Cramer-Rao Bound (CRB).Moreover, several important factors for indoor localization such as incidentangles, LEDs layouts (square and triangular LED arrays), LEDs numbers and totalnoise has been considered.

  • RF and OWC access system empowered heterogeneous network

    2016年  

    　概要を見る

      The mobile terminal has become anintegral device to society, enabling nearly ubiquitous communication of voiceand data. However, in some densely area, the limited bandwidth of radiocommunication can not satisfy each user with the increasing needs of amounts ofdata. In densely populated areas such as railway stations, current wirelesssystems such as Wi-Fi and LTE networks face great challenges or even fail todeliver high capacity and high quality-of-experience (QoE) broadband servicesto mobile users. This is mainly because current systems on one side are shortof radio bandwidth and lacking of synergy when conducting radio resourceoptimization. Optical wireless communication (OWC) can provide a high-speedcommunication. It combines the large bandwidth of optical fiber and themobility of current wireless communications using radio waves. However, opticalwireless communication also has some drawback such as the shadow issues. On theother hand, radio has the advantage of being available ubiquitously indoors andoutdoors, with the possibility of a seamless system infrastructure that allowsusers to move. This project is to design a hybrid radio frequency (RF) OWCsystem for providing high-speed broadband multimedia services in denselypopulated local areas.

  • Hybrid RF and Optical Wireless Access System

    2015年  

    　概要を見る

    This research project aims to provide an indoor service using hybrid optical wireless and radio communication. In this project, the optical communication is used to get the position information and control channel signal of the mobile terminal. Normally, photo diode is used for VLC system. In this project, instead of using photo diode, image sensor is chosen for receiving light signal since image sensor is able to spatially separate optical signals and other light noise. LED arrays, which can enable optical MIMO schemes, are used to increase the data rate. Experiments are carried out to demonstrate this　MIMO system using 6×6 LEDS and COMS image sensor as a receiver. In order to detect LED array from the serial photos taken by image sensor, two algorithms are proposed： Connected Component Labeling based LED array detection (CCLD) and Hough Transform based LED array Detection (HTD). In the LED array, 4 LEDs are Flag-LEDs, which are used for finding the start LED and decoding the LED array. CCLD and HTD algorithms are compared and the results show that CCLD is more suitable for our system. Moreover, an efficient data-traffic scheduling and radio resource allocation scheme is studied in this project. 

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