請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73899
標題: | 基於可定址紅綠藍發光二極體之空間多重輸入輸出色彩偏移調變可見光通訊系統 Spatial MIMO CSK Visible Light Communications with Addressable RGB LEDs |
作者: | Wei-Chen Yeh 葉韋辰 |
指導教授: | 蔡欣穆 |
關鍵字: | 可見光通訊,色彩偏移調變,可定址紅綠藍發光二極體, Visible Light Communications,Color Shift Keying,Addressable RGB LED, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 因其體積小、容易使用與低成本等特性,可定址紅綠藍發光二極體近年來在電腦周邊配件被廣泛使用。透過Arduino即可同時控制多顆可定址發光二極體,並指定紅、綠、藍強度給各顆燈,且支援每秒幾百次的顏色強度更新。雖然該燈應用仍僅侷限於鍵盤、耳機或風扇的裝飾燈效,但經由適當調頻與校正設計、就能實現基於可定址發光二極體為主的通訊。
本篇論文嘗試利用多顆可定址發光二極體與相機,設計並實作一套可見光通訊系統:透過空間多重輸入輸出與色彩偏移調變,我們試圖最大化既有硬體下的傳輸速率;此外,亦針對溫度、亮度控制機制等影響傳輸速率的因子進行探討,並基於多燈特性提出一套解決混色問題的方法。透過5顆可定址紅綠藍發光二極體與50 fps的相機,傳輸速率可達1.5 kbps且在距離6 m下仍保持95%的正確率。 Addressable RGB LEDs have gained popularity among computer peripherals in recent years due to its compact size, ease of use and low cost. They can be easily powered and controlled with single power supply and microcontroller such as Arduino. Different level of R, G, B intensities can also be assigned to each addressable RGB LED with refresh rate of hundreds of Hz. Despite that the applications of RGB addressable LEDs are currently limited to indicators or decorating light of computer peripherals such as keyboards, headphones and cooling systems, transmission of information with these LEDs is possible with proper design of modulation and format calibration. In this work, a prototype Visible Light Communications system combining multiple addressable RGB LEDs and a camera is built and evaluated. Spatial MIMO and Color Shift Keying are adopted in the system to maximize data rate under the current hardware setting. Performance impacted factors such as temperature and brightness control mechanism of addressable RGB LEDs are also investigated and discussed. Finally, a novel method to address the symbol-mixing issue is proposed by exploiting multiple LEDs. Our system utilizes 4096 colors to represent data symbols and is capable of achieving a data rate of 1.5 kbps with 5 addressable RGB LEDs under 50 frames per second in 6m, less than 20 pixels for region of each LED while achieving symbol accuracy of 95%. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73899 |
DOI: | 10.6342/NTU201903304 |
全文授權: | 有償授權 |
顯示於系所單位: | 資訊工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-108-1.pdf 目前未授權公開取用 | 3.06 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。