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研究生:謝竹詠
研究生(外文):HSIEH, CHU-YUNG
論文名稱:移動式非直視光學相機通訊於異質背景之訊號偵測演算法設計及效能評估
論文名稱(外文):Design and Performance Evaluation of Signal Detection Algorithm for Mobile Non-Line-of-Sight Optical Camera Communication under Heterogeneous Background
指導教授:連振凱連振凱引用關係
指導教授(外文):LAIN, JENN-KAIE
口試委員:蘇暉凱許正欣
口試委員(外文):SU, HUI-KAISHEU, JENG-SHIN
口試日期:2020-07-21
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2020
畢業學年度:108
語文別:中文
論文頁數:58
中文關鍵詞:可見光通訊非直視光移動式接收端異質背景安卓系統開關鍵控滾動式快門光對相機
外文關鍵詞:Visible light communicationsNon Line-of-SightAndroid MobileMobile receiverOOKRolling ShutterLight to camera
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發光二極體(Light-emitting diode, LED)燈具已逐漸取代傳統照明設備,藉由LED燈具進行可見光通訊資料傳輸,可增加現有燈具價值,此外在各式無線通訊技術中,可見光通訊有著不產生電磁干擾的優點,適合應用於機場、醫院等對電磁敏感環境,也因其封閉性且具有方向性傳輸特點,其安全性被受期待。
近期,以互補式金屬氧化物半導體(Complementary Metal Oxide Semiconductor, CMOS)影像感測器接收訊號之可見光通訊受到關注,在非直視光之光對CMOS相機傳輸系統中,過去許多研究多為純白背景,本論文使用移動式複雜異質背景,藉由LED燈當作傳送端,以非直視光傳輸接收方式,使用Android手機內建CMOS相機作為接收端,經過我們所提出之於異質背景下消除手機可見光干擾演算法,在平均移動速率35.3cm/s下,經計算位元錯誤率為1.06×〖10〗^(-3)。

Much research has been devoted to investigating optical camera communication (OCC) using CMOS sensor embedded in smartphone under the scenario of pure white reflective background. In order to make the experiment close to the real-world situation, we set up a slide rail and the heterogeneous reflective background to investigate non-line-of-sight (NLOS) OCC. In this thesis, we proposed to use signal detection algorithm and the image processing method under the environment of mobile non-line-of-sight optical camera communication with heterogeneous background. These methods are effective to eliminate interference background from the mobile receiver.
Using a proof-of-concept mobile NLOS OCC system, the experimental results demonstrated a significant improvement in the bit error rate when the proposed OCC signal recovery method was used for different distances between a smartphone and a heterogeneous reflective background.

摘要 i
Abstract ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
一、 緒論 1
1.1 前言 1
1.2 研究動機 3
1.3 論文架構與主要貢獻 5
二、 可見光通訊與CMOS相機 6
2.1 LED發光簡介 7
2.2 開關鍵控調變 8
2.3 CMOS影像感測器之滾動式快門與全局式快門原理及比較 9
2.3.1 捲簾式快門(Rolling Shutter, RS) 10
2.3.2 全局式快門(Global Shutter, GS) 11
2.3.3 全局式快門與滾動式快門比較 12
2.4 可見光通訊種類之傳送與接收方法 13
2.4.1 光對光接收器(Light - Photodetector) 14
2.4.2 螢幕對 CMOS 相機(Screen - Camera) 15
2.4.3 光對CMOS相機(Light - Camera) 16
2.4.3.1 直視光(Line-of-Sight, LOS) 17
2.4.3.2 非直視光(Non Line-of-Sight, NLOS) 18
2.5 於異質背景下可見光通訊接收及還原問題 19
三、 於移動環境與異質背景下之可見光通訊系統架構與硬體設計 20
3.1 系統架構 21
3.2 傳送端 22
3.3 接收端 26
3.3.1 手機CMOS相機感光度(ISO)與曝光度(Exposure)設定 26
3.3.2 拍攝設置與訊號接收 28
四、 可見光通訊於異質背景下圖像修復與判斷 29
4.1 修復原理 29
4.2 處理架構 30
4.3 前置處理 31
4.4 消除干擾背景 32
4.5 圖像修復 34
4.6 訊號判斷 36
五、 實驗結果與探討 39
5.1 接收端靜止下純白背景位元錯誤率 40
5.2 接收端移動下純白背景位元錯誤率 41
5.3 接收端靜止下異質背景位元錯誤率 42
六、 結論 46
參考文獻 47



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[8]C. W. Chow, C. Y. Chen, S. H. Chen, "Visible light communication using mobile-phone camera with data rate higher than frame rate," Opt. Express 23, 26080-26085 (2015)
[9]Z. Zhang, T. Zhang, J. Zhou, Y. Qiao, A. Yang, Y. Lu, "Performance Enhancement Scheme for Mobile-Phone Based VLC Using Moving Exponent Average Algorithm," IEEE Photonics Journal, vol. 9, no. 2, pp. 1-7, April 2017.
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[12]H. Du et al., "Martian: Message Broadcast via LED Lights to Heterogeneous Smartphones," in IEEE Journal on Selected Areas in Communications, vol. 35, no. 5, pp. 1154-1162, May 2017.
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[14]詹富丞。「智慧型手機可視光通訊異質背景干擾消除技術之研究」。碩士論文,國立雲林科技大學電子工程系,2018。
[15]J. He et al., "Efficient Sampling Scheme Based on Length Estimation for Optical Camera Communication," in IEEE Photonics Technology Letters, vol. 31, no. 11, pp. 841-844, 1 June1, 2019.

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