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研究生： 王榮宏
Rong-Horng Wang
論文名稱： 光學記錄MEPR2通道系統之時序恢復探討與研究
The Discussions and Researches of Timing Recovery on MEPR2 Digital Recording Systems
指導教授： 林銀議
Yin-Yi Lin
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 94
語文別： 中文
論文頁數： 91
中文關鍵詞： 位元錯誤率 、複雜度 、數位插值時序恢復 、插値器 、時序恢復
外文關鍵詞： timing recovery, Digital Interpolator Timing Recovery, interpolator, complexity, bit error rate (BER)
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    • 同步資訊傳輸的最基本部份之一就是時序恢復。本論文致力於時序恢復探討在MEPR2數位記錄系統中。我們利用數位插值時序恢復的架構來調整時序，並且分析各種不同的插値器的效能。在複雜度與位元錯誤率之下做折衷，我們使用截取長度為34Taps的升餘弦函數，做為時序恢復架構中的插値器。

    One of the most essential parts of synchronous data transmission is timing recovery. This thesis is devoted to the timing recovery discussion on MEPR2 digital recording systems. We make use of Digital Interpolator Timing Recovery structure for timing adjustment, and analyze the performance utilizing different kinds of interpolators. Considered a fundamental trade-off between complexity and bit error rate (BER), we utilize a truncated length Raised Cosine Function (34Taps) as interpolator in timing recovery structure.

    第一章 緒論.............................................................1 1.1 研究動機.........................................................1 1.2 光學記錄系統.....................................................2 1.3 光學通道模型.....................................................4 1.4 目的等化器.......................................................7 1.5 時序恢復簡介.....................................................8 第二章 插值器之類型與探討..............................................10 2.1 線性插值器......................................................10 2.2 Cubic插值器.....................................................11 2.3 Sinc 插值器.....................................................12 2.4 Raised Cosine 插值器............................................16 2.5 MMSE 插值器.....................................................19 第三章 時序函數的尋找..................................................23 3.1 時序恢復機制....................................................23 3.2 時序函數........................................................24 3.3 時序函數參數....................................................25 3.4 模擬退火法......................................................32 3.5 模擬結果........................................................36 第四章 數位插值器時序恢復架構..........................................42 4.1 系統架構........................................................42 4.2 插值器操作原理..................................................48 4.3 內插值之計算方式................................................51 4.3.1儲存插值函數離散值的方式............................................51 4.3.2 即時計算方式.......................................................53 4.4 時序相位獲得模式( Acquisition Mode ) ...........................54 4.4.1前置序列( Preamble )之選取..........................................54 4.4.2時序相位獲得模式下之位準重建 ( Digital Signal Reconstruction in Acquisition Mode )...............56 4.4.3 時序相位獲得模式下之時序誤差變異數…..57 4.5 時序相位循跡模式( Tracking Mode ) ..............................58 4.5.1時序相位循跡模式下之訊號重建........................................58 4.5.2時序相位循跡模式下之時序誤差變異數 ( Digital Signal Reconstruction in Tracking Mode )..................59 4.6 維特比偵測器....................................................61 4.7 系統模擬........................................................64 4.7.1時序相位調整收斂情形................................................64 4.7.2數位插值器模擬所需時間比較..........................................66 4.7.3位元錯誤率..........................................................68 第五章 結論............................................................72 中英對照表...............................................................73 參考文獻.................................................................76

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