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研究生:王凱立
研究生(外文):Kai-Li Wang
論文名稱:二次規劃法於可見光通訊使用分波長多工技術之研究
論文名稱(外文):A Study of WDM-VLC System Using Quadratic Programming
指導教授:張正春張正春引用關係
口試委員:陳建志謝有福
口試日期:2016-07-21
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:104
中文關鍵詞:濾波器陣列接收器、可見光通訊、分波長多工技術、多輸入多輸出、最佳化方法
外文關鍵詞:filter array receiver、VLC、WDM、Optimization、MIMO
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可見光通訊(Visible Light Communications, VLC)是一種利用可見光(380nm~780nm)進行資料傳輸的無線通訊,在資料傳輸上可進一步應用分波長多工技術(Wavelength Division Multiplexing, WDM),採用不同波長之光源進行資料傳輸,藉此提高系統傳輸量。一般可見光通訊系統使用光電二極體(Photo Diode, PD)作為接收光訊號元件,但由於光電二極體之光譜響應為固定,使得硬體上需使用特定波長之光電二極體作為接收,造成系統高成本並缺乏適應性。
近年來,使用濾波器陣列接收器(filter array receiver)作為WDM-VLC接收端之相關研究已被提出,透過訊號處理的方式達到分波長多工技術將VLC系統類比成多輸入多輸出 (Multiple Input Multiple Output, MIMO)系統,並且使用MIMO解調演算法求出不同光譜光源之傳輸訊號。為了降低系統解調運算複雜度,本論文使用二次規劃法(Quadratic Programming, QP),其最佳解搜尋過程中使用內點法(Interior Point Method),可將複雜度收斂至常數。另一方面,本論文也分別針對過往文獻之Two Stage QP演算法以及QP-BB演算法加以改良與探討。在模擬結果中,分別比較使用不同方式之QP演算法差異、探討模擬使用多個傳輸光源傳輸訊號效能、探討偵測演算法在不同傳送端數量效能。另外,我們也觀察偵測演算法在不同接收端數量之模擬效能,最後探討QP-BB以及球型解碼(Sphere Decoding, SD)演算法不同傳輸端數量之執行時間。
Visible Light Communication (VLC) is a kind of wireless communication that uses visible light to transmit the data. Using Wavelength Division Multiplexing (WDM) technique to transmit data, which uses different light spectrum simultaneously, can increase data rate in VLC system. In general, photoelectric-diode (PD) is used as the receiver of VLC systems to receive light. Due to the fixed light spectrum responses, it is necessary to use different kind of PDs with corresponded light spectrum to receive the input light that has different spectrum. Thus the resulting system would be in the high-cost and poor flexibility.
Recently, many researches using filter array receiver as the receiver in WDM-VLC systems have been proposed. WDM-VLC system are achieved through different ways of signal processing. Also, the system can be mimicked as a MIMO system, using MIMO detection techniques to detect the transmitted signal of different spectrum of light source. In order to reduce the computational complexity, we adopt the Quadratic Programming (QP) algorithm. Also, we study Two Stage Quadratic Programming algorithm (Two Stage-QP) and Quadratic Programming - Branch and Bound algorithm (QP-BB) to improve the performance. For the simulation results, we compare the performance of different ways of two stage QP algorithm. Moreover, we compare the performance of QP-BB with different branching order. Furthermore, we compare the performance under different number of transmitting light sources. Finally we discuss the execution time of Sphere Decoding (SD) and QP-BB at different numbers of transmitters.
摘 要 i
ABSTRACT ii
誌 謝 iii
目錄 iv
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1 前言 1
1.2 研究動機與方法 3
1.3 論文架構 5
第二章 背景知識 6
2.1 可見光通訊相關背景介紹 6
2.2 可見光通訊系統 8
2.2.1可見光通訊傳送端 9
2.2.2傳送端訊號調變方式 11
2.2.3傳送可見光通訊系統接收端:光電二極體 12
2.3 可見光通訊系統接收端相關議題 13
2.3.1 接收端使用光電二極體討論 13
2.3.2 陣列型光感測元件 15
2.4 多輸入多輸出介紹 17
2.5 多輸入多輸出偵測 18
2.6 最佳化方法 20
第三章 研究方法 21
3.1濾波器陣列接收器系統模型 21
3.2 WDM-VLC系統使用傳統MIMO無線通訊偵測訊號演算法 23
3.2.1 迫零訊號檢測 23
3.2.2 最小均方誤差偵測 24
3.2.3 球狀解碼演算法 26
3.3 WDM-VLC系統使用最大訊號對干擾加雜訊比合成 30
3.4 WDM-VLC系統使用二次規劃演算法 32
3.4.1二次規劃演算法 32
3.4.2二階二次規劃演算法 34
3.4.3二次規劃結合分支界定演算法 37
第四章 實驗與結果 47
4.1 WDM-VLC系統接收端設定 47
4.1.1定義光感測器輸出雜訊 47
4.1.2濾波器陣列接收器 49
4.2模擬環境設定 49
4.2.1使用三個傳輸燈源傳輸訊號 49
4.2.2使用四個傳輸燈源傳輸訊號 52
4.2.3使用二十個傳輸燈源傳輸訊號 54
4.3各演算法模擬結果比較 55
4.4各演算法改變傳輸燈源個數之效能比較 58
4.4.1使用四個傳輸燈源模擬結果 58
4.4.2使用二十個傳輸燈源模擬結果 61
4.5不同接收端個數之接收性能比較 63
4.6演算法複雜度分析 65
第五章 結論與未來研究 68
5.1結論 68
5.2未來研究 69
參考文獻 70
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