Faculty Profiles - YAMAZATO Takaya

Papers - YAMAZATO Takaya

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Multiple Information Sources Recognition Method for Ubiquitous Visible Light Communication Using on-Vehicle High-Speed Camera Reviewed Open Access

SHIRAKI Yasutake, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, YENDO Tomohiro, ARAI Shintaro

The transactions of the Institute of Electronics, Information and Communication Engineers. B Vol. 95 ( 11 ) page： 1517 - 1528 2012.11

Improvement of Error-Correcting Method Based on Chaotic Dynamics for Noncoherent Chaos Communications Reviewed

S. Arai, Y. Nishio, T. Yamazato

International Symposium on Nonlinear Theory and its Applications (NOLTA'12) page： pp.801-804 2012.10

Language：English

This paper focuses on characteristics of the chaotic dynamics and improves our previous errorcorrecting method using them for noncoherent chaos communications. Our previous method is performed by using a chaotic sequence generated according to the chaotic dynamics. In this case, it is very difficult to recover data without a successive sequence based on the chaotic dynamics. We focus on this feature and consider that an improved method separates and reconstructs the chaotic dynamics of the sequence according to a specific rule. Namely, the separation and reconstruction of the chaotic dynamics can be applied for our improved method as additional information. As results of simulations, we have confirmed that the advantage gained in BER performance of our improved method is about 2–2.5 dB compared to a conventional method (without coding).

Introduction of Nagoya University OCW

T. Yamazato

ICTSFC Workshop page： - 2012.9

Stochastic Resonance BFSK Receiver using Schmitt Trigger

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

Enginnering Sciences Society Conference of IEICE ( A-2-1 ) page： p.24 2012.9

Performance Evaluation of 2 users BFSK Receiver Stochastic Resonance

H. Tanaka, T. Yamazato, S. Arai

Enginnering Sciences Society Conference of IEICE ( A-2-2 ) page： p.25 2012.9

Phase Only Correlation Based Distance Estimation Scheme for Integrated R2V-VLC

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

page： - 2012.9

A Study on Cluster Lifetime in Multi-Hop Wireless Sensor Networks with Cooperative MISO Scheme Reviewed

Z. Huang, H. Okada, K. Kobayashi, M. Katayama

Journal of Communications and Networks Vol. 14 ( no.4 ) page： pp.443-450 2012.8

Language：English

As for cluster-based wireless sensor networks (WSNs), cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters, it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multi-input single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances ofclusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.

DOI： 10.1109/JCN.2012.6292251

A-2-1 Stochastic Resonance BFSK Receiver using Schmitt Trigger Reviewed

CHIGA Keita, TANAKA Hiroya, YAMAZATO Takaya, ARAI Shintaro

Proceedings of the Society Conference of IEICE Vol. 2012 page： 24 2012.8

A-2-2 Performance Evaluation of 2 users BFSK Receiver using Stochastic Resonance Reviewed

TANAKA Hiroya, YAMAZATO Takaya, ARAI Shintaro

Proceedings of the Society Conference of IEICE Vol. 2012 page： 25 2012.8

Demand of Teaching Material Development and OCW Open Access

T. Yamazato

60th JSEE Anual Conference Proceedings ( 8-331 ) page： - 2012.8

Interference Comparison of BFDM and Wavelet Based OFDM in Frequency Dispersive Channels Reviewed Open Access

GOTO Daisuke, YAMAZATO Takaya, MONGOL Bayarpurev

The transactions of the Institute of Electronics, Information and Communication Engineers. B Vol. 95 ( 8 ) page： 971 - 975 2012.8

Evbaluation of Error-Correcting Method Using Separation of Chaotic Dynamics for Noncoherent Chaos Communications

S. Arai, Y. Nishio and T. Yamazato

page： pp. 261-266 2012.7

Improvement Method of Data Rate for Overlay Hierarchical Coding for Road-to-Vehicle Visible Light Communication Using LED Array and High-Speed Camera Open Access

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

Technical Report of IEICE Vol. no.148 ( ITS2012-9 ) page： pp.19-24 2012.7

Language：Japanese

This paper aims to improve the data rate for the visible light communication system using LED array and high-speed camera. Previously, we have proposed the decoding algorithm using inverted signals for driving situation. However, using this method the data rate become a half, because we transmit original signals and inverted signals alternately for LED array tracking. In this paper, we propose the data rate improving method for overlay coding which is coding method that overlay two data. We confirm that we can improve data rate as compared with the previous method.

Open Access

Improvement Method of Data Rate for Overlay Hierarchical Coding for Road-to-Vehicle Visible Light Communication Using LED Array and High-Speed Camera Reviewed Open Access

NISHIMOTO Sayaka, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, YENDO Tomohiro, ARAI Shintaro

Vol. 112 ( 148 ) page： 19 - 24 2012.7

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

Open Access

CiNii Research

Driver Assistant System using Visible Light Communications : Road-to-Vehicle Visible Light Communications usign LED Array and On-Vehicle High-Speed Camera Reviewed Open Access

YAMAZATO Takaya

IEICE technical report. WBS, Wideband System Vol. 112 ( 147 ) page： 25 - 30 2012.7

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

We are conducting a study on visible light communications (VLC) using an LED traffic light and a high-speed camera equipped in a vehicle. Since we use the camera, we can capture and record surround images of the vehicle while receiving the data transmitted from the LED traffic light. This paper introduces the VLC system we are working on. Especially, this paper describes the advantages of road-to-vehicle VLC when the reception device is composed of high-speed camera.

Open Access

CiNii Research

[Poster Presentation] Road-to-Vehicle Communication and Distance Estimation System using Visible Light Communication

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

Technical Report of IEICE ( USN2012-9 ) page： pp.63-68 2012.5

Road-to-Vehicle Communication and Distance Estimation System using Visible Light Communication Reviewed Open Access

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

IEICE technical report Vol. 112 ( 31 ) page： 63 - 68 2012.5

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.

Open Access

CiNii Research

A Study on Cluster Partitioning with Cooperative MISO Scheme in Wireless Sensor Networks Reviewed

Z. Huang, H. Okada, M. Katayama, T. Yamazato

International Journal of Distributed Sensor Networks page： - 2012.4

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

This paper addresses the cluster partitioning problem in wireless sensor networks deployed in a continuous area. We present the model of the network and describe its operational details firstly. Both single-hop and multi-hop transmissions with cooperative Multi-Input Single-Output (MISO) scheme are considered for the inter-cluster communications. Besides, uniform and linear data fusions are discussed. Then the calculations of energy consumptions are derived. Different from other researches, the energy consumptions of intra-cluster communication in each cluster are included and modeled as functions of the cluster size. Finally, we simulate all possible cluster partitions by changing the numbers of clusters and cooperative transmitting nodes, and find the maximal network lifetimes. As a result, the relationships between cluster partitions and network lifetimes are clarified in different situations.

A Distance Estimation Scheme between the LED Array and On-Vihicle High-Speed Camera Using Visible Light Open Access

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

IEICE General Conference Vol. B-10B page： CD-ROM 2012.3

Preliminary Study on Bi-Polar Pulse Receiver using Stochastic Resonance Open Access

H. Tanaka, T. Yamazato, S. Arai

IEICE General Conference Vol. A-2 page： CD-ROM 2012.3

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Papers - YAMAZATO Takaya