採用實數運算核心哈特利轉換之ACO-OFDM可見光通訊系統架構與電路設計

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姓名

張特晉(Te-Chin Chang) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

採用實數運算核心哈特利轉換之ACO-OFDM可見光通訊系統架構與電路設計
(Architecture and Circuit Design for ACO-OFDM VLC System with Real-value Hartley Transform)

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摘要(中)

可見光通訊(Visible Light Communication, VLC)是一種利用可見光調變的通訊技術，所擁有的特性與一般傳輸大不相同，主要來自於傳輸介質是利用可見光而非一般的無線電，可見光相較於無線電擁有較高的安全性，可結合一般照明使用於廣播(Broadcast)或特定場合的單向傳輸，強度通常跟一般照明一樣，由於光線是人眼可見，若光束過強也可經由肉眼觀察出，因此相較之下，可見光通訊具有較高的安全性。可見光還具有其他優點，在後續章節會繼續探討。而本論文探討重點在解決可見光通訊系統中之通道衰減以及抵抗雜訊干擾提升傳輸效率。
本論文針對VLC系統設計一套利用不對稱剪裁正交分頻多工調變之規格，其規格是從IEEE 802.11a中改制而成，並利用此規格設計接收機用於VLC系統之中。此接收機包含時頻域轉換、同步和等化等設計。其中時頻域轉換使用較一般正交分頻多工不同於使用哈特利轉換器，其實數運算核心十分適合VLC系統，可達到節省硬體提升效能目的。等化包含通道估測和補償的資料回復設計。同步包含取樣時脈偏移估測補償和符碼區間偵測的設計。本論文使用Matlab與C平台建立模擬系統。電路部分使用Verilog HDL描述，並使用TSMC-90nm製程來實現所設計之電路，以驗證電路設計。

摘要(英)

Visible light communication is a communication technology, have very different characteristics with general communication technology because of the transmission media. Visible light communication has a higher security compared to radio communication. VLC can be combined with general lighting for use in a particular situation or a one-way broadcast transmission. The intensity of VLC is generally the same as lighting. If the beam is too strong can also be observed cause the transmission media is visible. We will continue to explore in the following sections about other advantages of VLC. The focus of this paper examines the visible light communication system in addressing the channel attenuation and resistance to noise interference to enhance the transmission efficiency.
In this paper, design a system for ACO-OFDM (Asymmetrically Clipped Optical OFDM). The specifications from the IEEE 802.11a in restructuring , and using this design specification for the system among VLC. The receiver comprises time and frequency domain conversion, synchronization, and so on. The conversion between time and frequency using Hartley converter instead of general Fourier converter in OFDM, the real arithmetic core of DHT is suitable for VLC. It achieve savings of hardware and enhance the effectiveness. Equalization includes channel estimation and compensation. Synchronization includes sampling clock offset estimation and compensation also have boundary detection.

關鍵字(中)

★ 可見光通訊
★ 取樣時脈位移
★ 不對稱剪裁正交分頻多工

關鍵字(英)

★ VLC
★ Sampling Clock Offset
★ ACO-OFDM

論文目次

摘要 i
Abstract iii
目錄 v
圖目錄 vii
表目錄 xi
第一章緒論 1
1.1 背景 1
1.2 研究動機 2
1.3 論文架構 2
第二章 VLC標準和系統架構 3
2.1 訊號調變 3
2.1.1 開關控制鍵調變 3
2.1.2 脈衝位置調變 4
2.1.3 正交分頻多工 4
2.1.4 直流偏壓正交分頻多工 6
2.1.5 不對稱剪裁正交分頻多工 7
2.2 系統架構 9
2.3 可見光通訊系統規格 13
2.3.1 循環字首 13
2.3.2 參考信號 14
2.3.3 反轉快速傅立葉轉換調變方法 14
2.3.4 反轉快速哈特利轉換調變方法 15
第三章 VLC 同步與等化架構 19
3.1 符碼邊界同步 19
3.1.1 符碼邊界位移效應 19
3.1.2 符碼邊界偏移估測 22
3.2 取樣時脈偏移同步 23
3.2.1 取樣時脈偏移效應 23
3.2.2 取樣時脈偏移估測 26
3.2.3 取樣時脈偏移補償 27
3.3 LMS頻域等化器 33
3.3.1 直角坐標系LMS頻域等化器 33
3.3.2 極座標系LMS頻域等化器 34
3.3.3 指數型增益和相位LMS頻域等化器 38
第四章頻域等化器架構設計 41
4.1 通道估測 41
4.2 座標軸旋轉數位計算器 42
4.2.1 原理說明 42
4.2.2 向量模式(Vectoring Mode) 44
4.2.3 旋轉模式(Rotation Mode) 45
4.3 自動增益控制與載波回復頻域等化器 46
第五章 VLC系統模擬與結果 51
5.1 模擬環境 51
5.2 取樣時脈偏移與補償模擬結果 52
5.3 星座圖模擬結果 55
5.4 雙迴路模擬結果 56
5.5 模擬結果與電路比較 61
5.5.1 定點數分析 61
5.5.2 過採樣分析 61
5.6 模擬與驗證結果 64
5.7 電路模擬結果 65
第六章結論與未來展望 67
參考文獻 69
附錄一 73
附錄二 75

參考文獻

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指導教授

薛木添(Mu-Tian Shiue)

審核日期

2015-7-21

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