研究者詳細 - 山里　敬也

論文 - 山里　敬也

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Maximum Likelihood Decoding Based on Pseudo-Captured Image Templates for Image Sensor Communication 査読有り

Shintaro ARAI, Haruna MATSUSHITA, Yuki OHIRA, Tomohiro YENDO, Di HE, Takaya YAMAZATO

Nonlinear Theory and Its Applications, IEICE 10 巻 ( 2 ) 頁： 173 - 189 2019年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人電子情報通信学会

<p>This paper focuses on an image sensor communication system that uses an LED as the transmitter and a high-speed image sensor (camera) as the receiver. Communication in this scheme depends on the quality of images transmitted from the LED to the sensor. If the image becomes unfocused on the way to the receiver, the LED luminance that make up the signal cannot be detected, so the receiver cannot demodulate the signal data. To overcome this problem, this study proposes a novel demodulation scheme to recover data from a degraded image, based on a maximum likelihood decoding (MLD) algorithm. The proposed method creates template images that imitate all possible blinking patterns produced by the LED transmitter, and then calculates the Euclidean distances between pixels in the captured image and the pseudo images for all possible blinking patterns. Finally, the algorithm chooses the image template with the smallest Euclidian distance from the received signal as the recovered data. Though an exhaustive set of image templates must be prepared for the proposed MLD, the number of templates depends on the number of LEDs on the transmitter. Thus, the computational complexity of this method increases as the number of transmitter LEDs increases. To reduce the computational complexity of the proposed MLD algorithm, the binary differential evolution (BDE) algorithm is used, which is a swarm intelligence technique. Computer simulations are used to evaluate the BDE algorithm's usefulness for reducing computational complexity and improving the BER of the communication system.</p>

DOI： 10.1587/nolta.10.173

Web of Science

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Parallel Transmission Using M-Point DFT for Image-Sensor-Based Visible Light Communication 査読有り

Kibe S.

2018 IEEE Globecom Workshops, GC Wkshps 2018 - Proceedings 2019年2月

Performance Evaluation of Precoded Pulse Width Modulation for Image Sensor Communication 査読有り

Kamegawa S.

2018 IEEE Globecom Workshops, GC Wkshps 2018 - Proceedings 2019年2月

Enhancing a BPSK receiver with Stochastic resonance by employing practical parallel arrayed network 査読有り

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

Nonlinear Theory and Its Applications, IEICE 10 巻 ( 1 ) 頁： 106 - 114 2019年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人電子情報通信学会

<p>Stochastic resonance (SR) is a noise-enhancement phenomenon that enables the detection of sub-threshold signals by adding noise and using nonlinear systems. This paper explores the applicability of SR in a BPSK receiver with sub-threshold signals. Although received signals are amplified as a result of the nonlinear behavior of the receiver, they are somewhat distorted. This results in the lower performance of SR receivers in comparison with linear receivers. Employing a parallel network of SR systems is expected to solve this problem. The present theoretical analysis demonstrates that in a certain noise intensity range, the output of the network can fully describe an input sub-threshold signal, and hence, the performance close to that of the linear receivers can be obtained. The effectiveness of the SR receiver was also demonstrated through a numerical example of the bit error rate (BER). However, achieving good BER performance requires an infinite number of arrayed SR systems, which is not realistic in practical systems. A design framework for an SR network with a finite number of elements and an appropriate noise intensity that can realize BER performance close to that in linear systems is also provided.</p>

DOI： 10.1587/nolta.10.106

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Analysis of Data Collected by the 700 MHz Band Intelligent Transport Systems for Reducing Ambulance Transportation Time 査読有り

Mitani Takuya, Yamazato Takaya, Naito Katsuhiro, Mori Yuki

2019 8TH IEEE INTERNATIONAL CONFERENCE ON CONNECTED VEHICLES AND EXPO (IIEEE CCVE) 2019年

Proposal for Identification Scheme of Driver and Impostor based on Acceleration Data 査読有り

Mori Yuki, Ono Ryota, Mitani Takuya, Naito Katsuhiro, Yamazato Takaya

2019 8TH IEEE INTERNATIONAL CONFERENCE ON CONNECTED VEHICLES AND EXPO (IIEEE CCVE) 2019年

Noise-aided demodulation with one-bit comparator for multilevel pulse-amplitude-modulated signals 査読有り

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

IEEE Wireless Communication Letters 7 巻 ( 5 ) 頁： 848 - 851 2018年10月

Technical Issues on IEEE 802.15.7m Image Sensor Communication Standardization 査読有り

Trang Nguyen, Islam Amirul, Yamazato Takaya, Jang Yeong Min

IEEE COMMUNICATIONS MAGAZINE 56 巻 ( 2 ) 頁： 213 - 218 2018年2月

N-Stream Superimposed System with m-Point DFT for Image-Sensor-Based Visible Light Communication 査読有り

Kibe S.

2017 IEEE Global Communications Conference, GLOBECOM 2017 - Proceedings 2018- 巻頁： 1 - 6 2018年1月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：2017 IEEE Global Communications Conference, GLOBECOM 2017 - Proceedings

This paper proposes an N-stream superimposed system for image-sensor-based visible light communications (ISbased VLC). Based on the principle of m-point discrete Fourier transform (DFT), a phase shift keying (PSK) signal is transmitted over m consecutive time slots mT, where T is a slot duration. In practice, the symbol rate of this paper is R/(m + 1) because a guard slot is inserted every m slots. In the superimposed system, N data streams where the symbol rate of the nth data stream, n = {1, 2, . . . , N}, is 1/(m+ 1)n-1 times the symbol rate of the first data stream are combined to form a pulse-width modulated (PWM) wave with a period time T. An IS receiver with a camera operating at a frame rate of R/(m+ 1)n-1 fps demodulates data streams whose symbol rate is R/m+ 1)n symbol/s or lower. Our experimental results validate that from a superimposed PWM wave of 500-symbol/s and 125-symbol/s data streams, a 2000-fps camera receiver demodulates both of the two data streams and the 500-fps camera receiver does the 125-symbol/s data stream successfully, without shortening individual error-free transmission ranges, compared with non-superimposed systems in which 500-symbol/s and 125- symbol/s data streams are independently transmitted by different light emitting diode (LED) transmitters and received by 2000-fps and 500-fps camera receivers, respectively.

DOI： 10.1109/GLOCOM.2017.8254784

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可視光通信実用化技術招待有り

山里敬也, 岡田啓

電子情報通信学会誌 101 巻 ( 1 ) 頁： 59-65 2018年1月

Simplified Vehicle Vibration Modeling for Image Sensor Communication 査読有り

KINOSHITA Masayuki, YAMAZATO Takaya, OKADA Hiraku, FUJII Toshiaki, ARAI Shintaro, YENDO Tomohiro, KAMAKURA Koji

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 101 巻 ( 1 ) 頁： 176-184 2018年

Interference-Aided Detection of Subthreshold Signal Using Beam Control in Polarization Diversity Reception. 査読有り

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

IEEE Communications Letters 22 巻 ( 9 ) 頁： 1926 - 1929 2018年

A Comparison of Reception Methods for Visible Light Communication Using High-speed Stereo Cameras 査読有り

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

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) 頁： . 2018年

Noise-aided demodulation with one-bit ADC for quadrature amplitude modulated signals 査読有り

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

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) 頁： . 2018年

LEO-MIMO Satellite Systems for High Capacity Transmission 査読有り

Goto Daisuke, Shibayama Hiroki, Yamashita Fumihiro, Yamazato Takaya

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) 頁： . 2018年

Parallel Transmission Using M-point DFT for Image-Sensor-Based Visible Light Communication 査読有り

Kibe Syuto, Kamakura Koji, Yamazato Takaya

2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) 頁： . 2018年

Performance Evaluation of Precoded Pulse Width Modulation for Image Sensor Communication 査読有り

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

2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) 頁： . 2018年

A Comparison of Reception Methods for Visible Light Communication Using High-Speed Stereo Cameras 査読有り

Kinoshita M., Yamazato T., Okada H., Fujii T., Arai S., Yendo T., Kamakura K.

2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings 2018年

記述言語：日本語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：2018 IEEE Global Communications Conference, GLOBECOM 2018 - 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

Scopus

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Image sensor communications for future ITS 査読有り

Yamazato T.

Optics InfoBase Conference Papers Part F112-SPPCom 2018 巻 2018年

LEO-MIMO Satellite Systems for High Capacity Transmission 査読有り

Goto D.

2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings 2018年

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論文 - 山里　敬也