| Project/Area Number |
16K06371
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Meijo University |
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Principal Investigator |
CHUJO WATARU 名城大学, 理工学部, 教授 (40292289)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 可視光通信 / イメージセンサ / ローリングシャッター / 空間輝度分布 / 空間多重 / スマートフォン / LED / LCD / 空間分割多重 / 双方向 / LEDアレイ / シンボル同期 / 逐次推定 / マルチアクセス |
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| Outline of Final Research Achievements |
High-speed, two-way, and multi-access optical camera communication was achieved. Downlink consists of LED lighting transmitter and smartphones’ built-in camera receiver. Uplink consists of smartphones’ built-in LCD display transmitter and indoor surveillance camera receiver.
To increase the symbol rate for downlink, we developed rolling-shutter asynchronous communication with variable symbol rates based on a cycle pattern of received symbols, ensemble average using dual rolling-shutter camera, and threshold decision based on spatial luminance distribution. On the other hand, adaptive thresholding considering spatial inter-symbol interference was developed for uplink.
In downlink, 156k symbol/s was achieved with LED array and smartphones’ built-in rolling-shutter camera. In uplink, 168.75k symbol/s was achieved with smartphones’ built-in LCD display and indoor camera based on space division multiplexing.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，既存のスマートフォン内蔵カメラと液晶ディスプレイ，LED照明と室内カメラを用いて双方向可視光通信を実現した．スマートフォンを用いて双方向可視光通信を実現した例は，国内外を含めてなく独自のシステムであり学術的意義は高い．
可視光は電波に比べて，免許や混信，情報漏洩の心配がなく，安全・安心に利用することができる．モノのインターネット(IoT)には環境に適応した様々な通信手段が必要と考えられる．電波にない特長を有する可視光通信をイメージセンサを用いて双方向化し，高速化できたことは社会的に意義がある．
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