Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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Performance Evaluation of Precoded Pulse Width Modulation for Image Sensor Communication Reviewed

Kamegawa Satoshi, Kinoshita Masayuki, Yamazato Takaya, Okada Hiraku, Fujii Toshiaki, Kamakura Koji, Yendo Tomohiro, Arai Shintaro

2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) page： . 2018

Parallel Transmission Using M-point DFT for Image-Sensor-Based Visible Light Communication Reviewed

Kibe Syuto, Kamakura Koji, Yamazato Takaya

2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) page： . 2018

Noise-aided demodulation with one-bit ADC for quadrature amplitude modulated signals Reviewed

Nakashima Yasuo, Yamazato Takaya, Arai Shintaro, Tanaka Hiroya, Tadokoro Yukihiro

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) page： . 2018

LEO-MIMO Satellite Systems for High Capacity Transmission Reviewed

Goto Daisuke, Shibayama Hiroki, Yamashita Fumihiro, Yamazato Takaya

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) page： . 2018

A Comparison of Reception Methods for Visible Light Communication Using High-Speed Stereo Cameras Reviewed

Masayuki Kinoshita, Takaya Yamazato, Hiraku Okada, Toshiaki Fujii, Shintaro Arai, Tomohiro Yendo, Koji Kamakura

2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings 2018

Language：Japanese Publishing type：Research paper (international conference proceedings)

In-vehicle cameras can be used as receivers for visible light communication in addition to their primary functions: for viewing assistance and object recognition. Most studies with this design perform tests via a single high-speed camera that is used as the receiver, but this study employs a receiver that uses a high-speed stereo camera. The reception method developed in this paper effectively utilizes left and right stereo images to improve communication performance. Although the selective diversity reception method proposed in previous work improved communication performance, it cannot deal with cases wherein both the left and right cameras introduce errors. To further improve the communication performance of this system, maximal ratio combining (MRC) diversity is applied to the high-speed stereo camera in this study. Communication performance is then evaluated comparing to the selective diversity reception and conventional single-camera reception by experimental tests conducted under static and driving conditions.

DOI： 10.1109/GLOCOM.2018.8647953

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Image sensor communications for future ITS Reviewed

Yamazato T.

Optics InfoBase Conference Papers Vol. Part F112-SPPCom 2018 2018

LEO-MIMO Satellite Systems for High Capacity Transmission Reviewed

Goto D.

2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings 2018

Noise-Aided Demodulation with One-Bit ADC for Quadrature Amplitude Modulated Signals. Reviewed

Yasuo Nakashima, Takaya Yamazato, Shintaro Arai, Hiroya Tanaka, Yukihiro Tadokoro

IEEE Global Communications Conference, GLOBECOM 2018, Abu Dhabi, United Arab Emirates, December 9-13, 2018 page： 1 - 6 2018

小特集編集にあたって Reviewed

Takaya Yamazato

電子情報通信学会誌 Vol.101 No.1 2018

Modulation and coding for image sensor communication Reviewed

Koji Kamakura, Takaya Yamazato

30th Annual Conference of the IEEE Photonics Society, IPC 2017 Vol. 2017- page： 235 - 236 2017.11

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Institute of Electrical and Electronics Engineers Inc.

Most practical visible light communication (VLC) systems being currently deployed with image sensor receivers use intensity modulation and direct detection scheme for outdoor and indoor applications. A number of modulation and coding techniques that are used for image sensor-based VLC systems are presented.

DOI： 10.1109/IPCon.2017.8116086

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The Uplink Visible Light Communication Beacon System for Universal Traffic Management Reviewed Open Access

Takaya Yamazato ; Naoaki Kawagita ; Hiraku Okada ; Toshiaki Fujii ; Tomohiro Yendo ; Shintaro Arai ; Koji Kamakura

IEEE Access ( 5 ) page： 22282 - 22290 2017.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

This paper presents a feasibility study of the uplink visible light communication (VLC) beacon system for the universal traffic management system (UTMS). The UTMS is a traffic management system beneath the National Police Agency of Japan. Currently, 55 000 UTMS infrared beacon systems have been installed, and they provide expressway and ordinary road information to cars. However, the data rate is 1 Mbps, and a faster data rate is necessary to support automotive and smart mobility devices. In this paper, we propose an uplink V2I system for the UTMS. The system is designed to match the current beacon system as closely as possible, so that the system can easily be replaced and still provide sufficient bandwidth for future automotive and smart mobility devices. We adopt a photo diode (PD) as the VLC receiver and a commercially available off-the-shelf LED headlight as a transmitter. Unfortunately, the bandwidth of such an LED is usually small, so we consider applying a bit-loading algorithm to direct-current-biased optical orthogonal frequency division multiplexing. To reduce strong background noise, such as from the sun, we narrow down the field-of-view by applying a lens to the PD, which forms a tiny communication area, smaller than the current infrared beacon system. We then consider multiple PDs with the lens to create a similar communication area as the infrared beacon system. As a result, we achieve 3.1-Mbps throughput.

DOI： 10.1109/ACCESS.2017.2759179

Open Access

Modeling and parameter estimation of vehicle vibration inducing transmitter displacement in ITS image sensor communication Reviewed

Masayuki Kinoshita, Takaya Yamazato, Hiraku Okada, Toshiaki Fujii, Shintaro Arai, Tomohiro Yendo, Koji Kamakura

2017 IEEE International Conference on Communications Workshops, ICC Workshops 2017 page： 144 - 149 2017.6

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Institute of Electrical and Electronics Engineers Inc.

Image sensor communication (ISC), which is derived from visible light communication (VLC), is a novel form of wireless communication that uses an image sensor as a receiver. ISC is an attractive solution for outdoor mobile environments and is particularly well-suited to intelligent transport systems (ITS). The purpose of this paper is to derive the dominant components of vehicle vibrations and road surface irregularities that induce transmitter displacement in ITS-ICS in paved road scenarios. Such displacements make it difficult for a ISC receiver to select the correct pixels. We measured vehicle vibrations during an actual driving scenario using a six-axis acceleration sensor installed in a smartphone. Using the results obtained, we performed a frequency analysis of the vehicle vibrations and determined the parameters of vehicle vibrations based on the frequency characteristics. This paper explains that the vehicle vibrations that affect the communication performance can be modeled by solely using Gaussian random processes when a high frame rate (e.g. 1000 fps) image sensor is used as the ISC receiver.

DOI： 10.1109/ICCW.2017.7962648

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Global Communications Newsletter Reviewed

S. Bregni, T. Yamazato, V. Bota, L. Ma

IEEE Communications Magazine Vol. 55 ( 2 ) page： 13 - 16 2017

Language：English Publishing type：Research paper (scientific journal)

Asia/Pacific Region
Interview with Takaya Yamazato, Director of the AP Region
This is the fourth article in the series of eight, started in November 2016 and published monthly in the IEEE ComSoc Global Communications Newsletter, which covers all areas of IEEE ComSoc Member and Global Activities. In this series of articles, I am introducing the six MGA Directors (Sister and Related Societies; Membership Services; AP, NA, LA, EMEA Regions) and the two Chairs of the Women in Communications Engineering (WICE) and Young Professionals (YP) Standing Committees. In each article, one by one they present their sector activities and plans.

In this issue, I interview Takaya Yamazato, Director of the Asia/Pacific Region (AP). Takaya is a professor at the Institute of Liberal Arts and Sciences, Nagoya University, Japan. He received the Ph.D. degree from Keio University, Yokohama, Japan, in 1993. From 1993 to 1998 he was an assistant professor in the Department of Information Electronics, Nagoya University, Japan. From 1997 to 1998 he was a visiting researcher in the Research Group for RF Communications, Department of Electrical Engineering and Information Technology, University of Kaiserslautern, Germany. In 2006 he received the IEEE Communication Society Best Tutorial Paper Award. He served as symposium co-chair of ICC 2009 and ICC 2011. From 2008 to 2010 he was the chair of the IEEE ComSoc Satellite and Space Communications Technical Committee and the editor-in-chief of the Japanese Section of IEICE Transactions on Communications. His research interests include visible light communication, intelligent transport systems, stochastic resonance, and open educational resources.

DOI： 10.1109/MCOM.2017.7841463

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Effect of a root-raised-cosine filter on a BPSK stochastic resonance receiver Open Access

Nakashima Yasuo, Tanaka Hiroya, Yamazato Takaya, Tadokoro Yukihiro, Arai Shintaro

IEICE NONLINEAR THEORY AND ITS APPLICATIONS Vol. 8 ( 3 ) page： 204-214 2017

Effect of a root-raised-cosine filter on a BPSK stochastic resonance receiver Reviewed Open Access

Nakashima Yasuo, Tanaka Hiroya, Yamazato Takaya, Tadokoro Yukihiro, Arai Shintaro

IEICE NONLINEAR THEORY AND ITS APPLICATIONS Vol. 8 ( 3 ) page： 204-214 2017

Overview of Visible Light Communications - With Emphasis on Image Sensor Communications -

Yamazato Takaya

2017 23RD ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): BRIDGING THE METROPOLITAN AND THE REMOTE page： 564-569 2017

N-Stream Superimposed System with m-point DFT for Image-Sensor-Based Visible Light Communication

Kibe Syuto, Kamakura Koji, Yamazato Takaya

GLOBECOM 2017 - 2017 IEEE GLOBAL COMMUNICATIONS CONFERENCE page： . 2017

Modulation and Coding For Image Sensor Communication

Kamakura Koji, Yamazato Takaya

30TH ANNUAL CONFERENCE OF THE IEEE PHOTONICS SOCIETY (IPC) page： 235-236 2017

Overview of visible light communications with emphasis on image sensor communications. Reviewed

Takaya Yamazato

23rd Asia-Pacific Conference on Communications, APCC 2017, Perth, Australia, December 11-13, 2017 Vol. 2018-January page： 1 - 6 2017

V2X communications with an image sensor. Reviewed

Takaya Yamazato

J. Comm. Inform. Networks Vol. 2 ( 4 ) page： 65 - 74 2017

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Papers - YAMAZATO Takaya