結合等化與取樣時脈同步雙迴路架構設計

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姓名

陳柏翰(Bo-Han Chen) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

結合等化與取樣時脈同步雙迴路架構設計
(Joint Equalization and Sampling Clock Synchronization in Dual-Loop Architecture)

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摘要(中)

正交分頻多工技術對於克服傳輸通道的頻率選擇性衰減效應以及符碼際干擾具有良好的效果。然而，傳送與接收端間的非同步效應會破壞正交分頻多工系統之正交性，進而引進子載波間干擾，將會大幅降低系統之效能。
本論文著重在估測並解決正交分頻多工系統中的取樣時脈偏移非同步問題。我們利用基於自動增益與載波回復之頻域等化器中的相位誤差量，估測出取樣時脈偏移所造成之相位旋轉，將此訊息經由我們所提出之雙迴路系統架構來補償取樣時脈偏移。除此之外，我們結合了傳統時域等化器與Farrow內插器電路，利用時域等化器中係數收斂完成後即閒置之電路，達到係數內插器之功能。

摘要(英)

OFDM system has good ability on resisting frequency selective channel fading and inter-symbol interference (ISI). However, non-ideal effects such as synchronization issue between transmitter and receiver will degrade system performance. The orthogonality of OFDM system is destroyed by introducing inter-carrier interference (ICI).
In this thesis, we focus on estimation and compensation methods of sampling clock offset (SCO) effect in an OFDM system. We can estimate phase rotation caused by SCO with phase error information obtained in auto-gain control and carrier recovery based frequency-domain equalizer (AGC-CR FEQ). Then the SCO effect can be compensated in the proposed dual-loop system architecture. Moreover, the conventional time-domain equalizer (TEQ) and Farrow structure interpolator are combined. We occupy idle circuits after coefficients updating in the TEQ to achieve TEQ coefficients interpolation.

關鍵字(中)

★ 正交分頻多工
★ 時域等化器
★ 頻域等化器
★ 取樣時脈偏移

關鍵字(英)

★ TFO
★ FEQ
★ TEQ
★ OFDM

論文目次

摘要 i
Abstract ii
誌謝 iii
目次 iv
圖目錄 vi
表目錄 viii
第一章序論 1
1.1 研究動機 1
1.2 OFDM系統架構 1
1.2.1正交分頻多工(OFDM)調變簡介 1
1.2.2 OFDM數學模型 2
1.2.3 OFDM系統架構 3
1.3 論文架構 4
第二章 OFDM等化與同步架構設計 5
2.1 時域等化器 5
2.1.1最大縮短信號雜訊比(MSSNR)時域等化器 5
2.1.2直角座標系LMS時域等化器 8
2.2 頻域等化器 12
2.2.1直角座標系LMS頻域等化器 12
2.2.2極座標系LMS頻域等化器 14
2.3 取樣時脈偏移同步 17
2.3.1取樣時脈偏移效應 18
2.3.2取樣時脈偏移估測 20
2.3.3取樣時脈偏移補償 21
第三章結合等化器與取樣時脈同步架構設計 29
3.1利用頻域等化器估測取樣時脈偏移 29
3.2利用時域等化器補償取樣時脈偏移 32
3.3結合等化與取樣時脈同步雙迴路架構 37
第四章 OFDM系統模擬 40
4.1 模擬環境 40
4.2 模擬結果 41
第五章電路架構設計與模擬驗證結果 48
5.1 電路架構設計 48
5.2 RTL 模擬驗證結果 54
5.3 FPGA驗證平台 57
5.4 FPGA驗證結果 57
第六章結論與展望 60
參考文獻 61

參考文獻

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指導教授

薛木添(Muh-Tian Shiue)

審核日期

2011-1-17

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