Faculty Profiles - YAMAZATO Takaya

This paper discusses the stochastic resonance (SR) effect in a binary communication system for subthreshold signal reception. We focus on the problem of no communication when received signal strength is below receiver sensitivity. Subthreshold signal reception requires a device that exhibits SR, such as a Schmitt trigger or a comparator. Previously, we proposed an alternative three-level device and demonstrated its high performance for subthreshold signal reception in an SR receiver. In the present study, we show that our proposed three-level device outperforms the three devices and discuss reasons for this superior performance. Contributions of our present paper are twofold: first, we analytically derive bit error rate (BER) performances of SR receivers installed with a Schmitt trigger and a comparator;second, we compare performances of the Schmitt trigger, comparator, and three-level device.

DOI： 10.1587/nolta.7.407

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A New Automotive VLC System Using Optical Communication Image Sensor Reviewed Open Access

Yuki Goto, Isamu Takai, Takaya Yamazato, Hiraku Okada, Toshiaki Fujii, Shoji Kawahito, Shintaro Arai, Tomohiro Yendo, Koji Kamakura

IEEE PHOTONICS JOURNAL Vol. 8 ( 3 ) 2016.6

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

As a new technology for next-generation vehicle-to-everything (V2X) communication, visible-light communication (VLC) using light-emitting diode (LED) transmitters and camera receivers has been energetically studied. Toward the future in which vehicles are connected anytime and anywhere by optical signals, the cutting-edge camera receiver employing a special CMOS image sensor, i.e., the optical communication image sensor (OCI), has been prototyped, and an optical V2V communication system applying this OCI-based camera receiver has already demonstrated 10-Mb/s optical signal transmission between real vehicles during outside driving. In this paper, to reach a transmission performance of 54 Mb/s, which is standardized as the maximum data rate in IEEE 802.11p for V2X communication, a more advanced OCI-based automotive VLC system is described. By introducing optical orthogonal frequency-division multiplexing (optical-OFDM), the new system achieves a more than fivefold higher data rate. Additionally, the frequency response characteristics and circuit noise of the OCI are closely analyzed and taken into account in the signal design. Furthermore, the forward-current limitation of an actual LED is also considered for long operational reliability, i.e., the LED is not operated in overdrive. Bit-error-rate experiments verify a system performance of 45 Mb/s without bit errors and 55 Mb/s with BER < 10(-5).

DOI： 10.1109/JPHOT.2016.2555582

A-14-8 Preliminary Study of Platoon Management using 700MHz Band Vehicle-to-Infrastructure Cooperative System Reviewed

OHNO Ryota, YAMAZATO Takaya

Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference Vol. 2016 page： 194 2016.3

A-9-17 BER Performance of NLOS Vehicle to Vehicle Visible Light Communication Using Optical OFDM Reviewed

KAWAGITA Naoaki, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, ARAI Shintaro, YENDO Tomohiro, KAMAKURA Koji

Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference Vol. 2016 page： 153 2016.3

AS-3-10 High Speed Image Sensor Based I2V-VLC Channel Modeling in Outdoor Mobile Environment Reviewed

KINOSHTTA Masayuki, YAMAZATO Takaya, OKADA Hiraku, FUJII Yoshiaki, ARAI Shintaro, Yendo Tomohiro, KAMAKURA Koji

Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference Vol. 2016 page： "S - 53"-"S-54" 2016.3

BI-4-3 ITS Visible Light Communications using High-Speed Image Sensor Reviewed

Yamazato Takaya

Proceedings of the IEICE General Conference Vol. 2016 ( 1 ) page： "SS - 71"-"SS-72" 2016.3

BI-4-3 ITS Visible Light Communications using High-Speed Image Sensor Reviewed

Yamazato Takaya

Proceedings of the IEICE General Conference Vol. 2016 ( 2 ) page： "SS - 83"-"SS-84" 2016.3

N-2-2 Performance Evaluation of Stochastic Resonance Receiver in Bandlimited BPSK Modulations Reviewed

Nakashima Yasuo, TANAKA Hiroya, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference Vol. 2016 2016.3

NBS-1-1 Performance Improvement of Stochastic Resonance Receiver by Uniform Noise and Binary Noise Reviewed

TANAKA Hiroya, NAKASHIMA Yasuo, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

Proceedings of the IEICE Engineering Sciences Society/NOLTA Society Conference Vol. 2016 page： "S - 113"-"S-114" 2016.3

NBS-1-1 Performance Improvement of Stochastic Resonance Receiver by Uniform Noise and Binary Noise Reviewed

TANAKA Hiroya, NAKASHIMA Yasuo, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

Proceedings of the IEICE General Conference Vol. 2016 ( 2 ) page： "S - 133"-"S-134" 2016.3

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Papers - YAMAZATO Takaya