Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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Performance evaluation of the weak signal detection of the Stochastic Resonance Receiver using Schmitt Trigger Reviewed Open Access

CHIGA Keita, TANAKA Hiroya, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

IEICE technical report. Nonlinear problems Vol. 113 ( 271 ) page： 19 - 23 2013.10

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Stochastic Resonance(SR) is a nonlinear phenomena in which the Signal-to-Noise Ratio(SNR) is enhanced by an increase of the noise. By using SR, we can detect the weak signal which cannot detect by the conventional receiver. In this paper, we consider the application of SR to the communication systems. we implement the Stochastic Resonance Receiver using Schmitt Trigger as the Stochastic Resonance system. We evaluate the performance of the weak signal responce and we discuss about the weak signal detection.

Open Access

CiNii Research

Performance Evaluation of Error-Correcting Scheme Using Separation of Chaotic Dynamics for Number of Transmitting Data Reviewed Open Access

ARAI Shintaro, NISHIO Yoshifumi, YAMAZATO Takaya

IEICE technical report. Nonlinear problems Vol. 113 ( 271 ) page： 205 - 209 2013.10

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Noncoherent chaos communications, which do not need to use basis signals (unmodulated carriers) for demodulation, are unique communication systems using characteristics of chaos. However, the communication performance of the noncoherent system is lower as compared with the standard communication systems. Thus, it is important to advance noncoherent system in order to improve its performance. In our previous research, we have proposed a novel error-correcting method using a separation and reconstruction of the chaotic dynamics, which is one of characteristics of chaos. As simulation results, we have confirmed that the advantage gained in BER performance of our error-correcting method is about 2--2.5 dB compared to the conventional one (w/o coding). This paper focuses on a number of transmitting data and a combination of symbols, and analyzes an error-correcting capability for evaluating advantages of the separation and reconstruction of the chaotic dynamics in detail.

Open Access

CiNii Research

Utilization of Spatio-temporal image for LED array acquisition in Road to Vehicle Visible Light Communication Reviewed

S.Usui, T.Yamazato, S.Arai, T.Yendo, T.Fujii, H.Okada

20th World Congress on Intelligent Transport Systems page： - 2013.10

Language：English

In this paper, we focus attention on visible light communication systems using an LED array as a transmitter and a high-speed camera as a receiver for road-to-vehicle communications (R2V-VLC) in intelligent transport systems. To implement R2V-VLC, it is necessary for the receiver to search the target LED array from the captured images (LED array acquisition) before data demodulation. We propose a new approach for LED array acquisition. We focus on spatio-temporal image and spatio-temporal cross-section image and show LED array in the spatio-temporal image has high time-gradient value and low space-gradient value. Using such characteristic gradient values, we propose new LED array acquisition method. As the results of the experiment in driving situation, we can achieve acquisition miss rate = 0%.

Accuracy Improvement by Phase Only Correlation for Distance Estimation Scheme for Visible Light Communications Using an LED Array and a High-speed Camera Reviewed Open Access

A. Ohmura, T. Yamazato, H. Okada, T. Fujii, T. Yendo, S. Arai

20th World Congress on Intelligent Transport Systems page： - 2013.10

Language：English

In this paper, we focus on a distance estimation scheme using camera. Our distance estimation scheme is based on triangulation. The accuracy of camera based scheme is governed by resolution of a camera, or equivalently the size of pixel. Therefore we introduce phase only correlation (POC) to estimate with subpixel accuracy. As a result of experiment, we will show that our scheme achieves less than 0.3m estimation error at the distance of 60m. By using POC, the resolution of estimation reaches nearly 0.02 pixel, much less than one pixel.

Open Access

A Study on Implementation of Stochastic Resonance Receiver using Schmitt Trigger Open Access

K. Chiga, H. Tanaka, T. Yamazato, Y. Tadokoro, S. Arai

IEICE Society Conference ( A-2-13 ) page： p.32 2013.9

The outline of I-Scover (IEICE Knowledge Discovery)

T. Yamazato

IEICE Society Conference page： - 2013.9

A Study on the Signal Sensitivity of Stochastic Resonance Receiver for the Subthreshold Bi-Polar Pulse Detection

H. Tanaka, K. Chiga, T. Yamazato, Y. Tadokoro, S. Arai

Enginnering Sciences Society Conference of IEICE ( A-2-14 ) page： p. 33 2013.9

Implementation of Bi-Polar Pulse SR Receiver Using Schmitt Trigger and Evaluation of its Performance Reviewed

K.Chiga, H.Tanaka, T.Yamazato, Y.Tadokoro, S.Arai

2013 International Symposium on Nonlinear Theory and its Application(NOLTA 2013) page： - 2013.9

Language：English

We consider an application of Stochastic Resonance to wireless communication system. Stochastic Resonance (SR) is well known as a phenomenon in which weak signal in nonlinear system can be detected by added noise. A receiver using Stochastic Resonance (SR Receiver) can detect a weak signal which is not detectable in the conventional receiver. In this paper, we consider the implementation of bi-polar pulse SR Receiver using Schmitt Trigger and evaluate the performance in Signal-to-Noise Ratio (SNR) and Bit Error Rate (BER).

[Invited Talk] Application of visible light communication to LED traffic light

T. Yamazato

Proceeding of 2013 Annual Conference of IEIJ page： - 2013.9

A Study on Implementation of Stochastic Resonance Receiver using Schmitt Trigger Reviewed Open Access

CHIGA Keita, TANAKA Hiroya, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

Proceedings of the Society Conference of IEICE Vol. 2013 page： 32 2013.9

A Study on the Signal Sensitivity of Stochastic Resonance Receiver for the Subthreshold Bi-Polar Pulse Detection Reviewed

TANAKA Hiroya, CHIGA Keita, YAMAZATO Takaya, TADOKORO Yukihiro, ARAI Shintaro

Proceedings of the Society Conference of IEICE Vol. 2013 page： 33 2013.9

Let's Search IEICE Contents through New Meta-Data System I-Scover!

T. Yamazato

IEICE Global Plaza Vol. No.55 page： - 2013.8

Language：English

IEICE launched the new metadata search system called "I-Scover" on April 3, 2013. For the time being, I-Scover provides the metadata search service of all papers published in IEICE transactions covering from the first edition published in 1968 up to the present edition, Technical Reports (from 2006) and international conference papers of ISPA and EMC. The total number of searchable contents reaches 150,000. This article briefly introduces I-Scover. Before going to the details, let me start with a quiz. What phrase do you guess if you say "I-Scover" for three times?

Lectures in Nagoya University OCW that providing play and learning experiences Reviewed Open Access

T. Yamazato

2013 JSEE Annual Conference page： - 2013.8

M-ary Modulation Method Using Separation of Chaotic Dynamics for Noncoherent Chaos Communications

S. Arai, Y. Nishio and T. Yamazato

The 26th Workshop on Circuits and Systems page： - 2013.7

Distance Estimation Scheme for Integrated V2I-VLC Simulating the Vibration of Driving Vehicle Open Access

A.OHMURA, T.YAMAZATO, H.OKADA, T. FUJII, T. YENDO, S. ARAI

Technical Report of IEICE ( ASN2013-55 ) page： pp.41-46 2013.7

Language：Japanese

In road-to-vehicle visible light communication data is transmitted toward moving vehicles from theLED array installed on roads. Robust data reception and fast communication are possible by using a high-speedcamera as it can reduce the vibration of vehicles. In this road-to-vehicle visible light communication, we proposean integrated system of communication and distance estimation by sending a known data pattern from the LEDarray. On issues which is distance estimation performance deterioration by the vibration of the running vehicle, tryto resolve them using the technique using the phase-only correlation method.

Open Access

LED array acquisition method based on Spatio-temporal image in Road to Vehicle Visible Light Communication Open Access

S.Usui, T.Yamazato, S.Arai, T.Yendo, T.Fujii, H.Okada

Technical Report of IEICE ( ASN2013-55 ) page： pp.47-52 2013.7

Language：Japanese

In this paper, we focus attention on road-to-vehicle visible light communication(R2V-VLC) in intelligent transport systems. This system uses an LED array as a transmitter and a high-speed camera as a receiver. To implement R2V-VLC, it is necessary to acquire the target LED array from the captured images at receiver before data demodulation. To achieve accurate aquisition, we analyze LED array by use of Spatio-temporal image. As the result of the analysis, we show the LED array in the spatio-temporal image has high time-gradient value and low space-gradient value. After that we propose a new LED array acquisition method using such characteristic gradient values.

Open Access

LED array acquisition method based on Spatio-temporal image in Road to Vehicle Visible Light Communication Reviewed Open Access

USUI Syunsuke, YAMAZATO Takaya, ARAI Shintaro, YENDO Tomohiro, FUJII Toshiaki, OKADA Hiraku

IEICE technical report Vol. 113 ( 129 ) page： 19 - 24 2013.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In this paper, we focus attention on road-to-vehicle visible light communication(R2V-VLC) in intelligent transport systems. This system uses an LED array as a transmitter and a high-speed camera as a receiver. To implement R2V-VLC, it is necessary to acquire the target LED array from the captured images at receiver before data demodulation. To achieve accurate acquisition, we analyze LED array by use of Spatio-temporal image. As the result of the analysis, we show the LED array in the spatio-temporal image has high time-gradient value and low space-gradient value. After that we propose a new LED array acquisition method using such characteristic gradient values.

Open Access

CiNii Research

Distance Estimation Scheme for Integrated V2I-VLC Simulating the Vibration of Driving Vehicle Reviewed Open Access

OHMURA Akihiro, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, YENDO Tomohiro, ARAI Shintaro

IEICE technical report Vol. 113 ( 129 ) page： 13 - 17 2013.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In road-to-vehicle visible light communication data is transmitted toward moving vehicles from the LED array installed on roads. Robust data reception and fast communication are possible by using a high-speed camera as it can reduce the vibration of vehicles. In this road-to-vehicle visible light communication, we propose an integrated system of communication and distance estimation by sending a known data pattern from the LED array. On issues which is distance estimation performance deterioration by the vibration of the running vehicle, try to resolve them using the technique using the phase-only correlation method.

Open Access

CiNii Research

LED array acquisition method based on Spatio-temporal image in Road to Vehicle Visible Light Communication Reviewed Open Access

USUI Syunsuke, YAMAZATO Takaya, ARAI Shintaro, YENDO Tomohiro, FUJII Toshiaki, OKADA Hiraku

IEICE technical report Vol. 113 ( 131 ) page： 27 - 32 2013.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In this paper, we focus attention on road-to-vehicle visible light communication(R2V-VLC) in intelligent transport systems. This system uses an LED array as a transmitter and a high-speed camera as a receiver. To implement R2V-VLC, it is necessary to acquire the target LED array from the captured images at receiver before data demodulation. To achieve accurate acquisition, we analyze LED array by use of Spatio-temporal image. As the result of the analysis, we show the LED array in the spatio-temporal image has high time-gradient value and low space-gradient value. After that we propose a new LED array acquisition method using such characteristic gradient values.

Open Access

CiNii Research

Distance Estimation Scheme for Integrated V2I-VLC Simulating the Vibration of Driving Vehicle Reviewed Open Access

OHMURA Akihiro, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, YENDO Tomohiro, ARAI Shintaro

IEICE technical report. ASN, Ambient intelligence and sensor networks Vol. 113 ( 132 ) page： 41 - 45 2013.7

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

In road-to-vehicle visible light communication data is transmitted toward moving vehicles from the LED array installed on roads. Robust data reception and fast communication are possible by using a high-speed camera as it can reduce the vibration of vehicles. In this road-to-vehicle visible light communication, we propose an integrated system of communication and distance estimation by sending a known data pattern from the LED array. On issues which is distance estimation performance deterioration by the vibration of the running vehicle, try to resolve them using the technique using the phase-only correlation method.

Open Access

CiNii Research

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Papers - YAMAZATO Takaya