博碩士論文 93226042 詳細資訊




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姓名 詹綉綾(Hsiu-Lin Chan)  查詢紙本館藏   畢業系所 光電科學與工程學系
論文名稱 新型灰階編碼於全像儲存系統之研究
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摘要(中) 光學儲存為現今主流的儲存技術,其中全像光學儲存更可將儲存
容量提高至100GB,但由於全像光學儲存有過多雜訊源而限制其儲存
容量,藉由編解碼過程可降低錯碼率提昇儲存容量,本論文研究全像
儲存系統中的各種編碼方法,並提出一新型灰階編碼概念,不同於以
往的文獻,是利用其忽略不用的二維偵測器之像素深度來做編碼。新
型灰階編碼的優點為碼率R≈1,且可與其他編碼結合使用於全像儲
存系統中。
本實驗中建立一套測試錯碼率的系統,將RS 碼、平衡區塊碼和新型
灰階編碼之編解碼程式撰寫完成,並測試了兩種編碼與未編碼的圖
形,測試結果顯示,未編碼的資料錯碼率約為2.71×10−5;RS 碼和6:8
平衡區塊碼經測試得到錯誤的位元數為零,計算出錯碼率為零。
摘要(英) Optical Storage is the major of the current storage technology.
Holographic data storage can enhance the storage capacity to 100GB. But,
holographic data storage has excessively many noise to limit its storage
capacity. Coding processing can reduce the BER to a sufficiently low
level, and improve storage capacity. This thesis studies on holographic
data storage system each code method, and proposes the concept of New
gray-scale code. This method is different to the former literature, uses the
pixel depth of the two-dimensional detector to make the code. The merit
of New gray-scale code is that the code rate approaches one (R ),New
gray-scale code also can be using in holographic data storage system with
other code.
≈1
This experiment establishes testing the wrong code rate system. The
decoding programs of RS codes and Balance block codes and New
gray-scale code be written. We also test two kind of codes and not the
encoded graphs. The result showed uncode data wrong code rate
approximately is , the error bits of the RS code and Balance
block code both are zero (BER=0).
論文目次 中文摘要....................................................................................... I
英文摘要.................................... ................................................. II
誌謝............................................................................................... III
目錄............................................................................................... IV
圖目錄........................................................................................... VII
表目錄........................................................................................... IX
第一章 緒論............................................................................... 1
第二章 全像儲存之原理與系統............................................... 6
2.1 基本全像儲存原理.......................................................... 6
2.1.1 全像記錄與重建...................................................... 6
2.1.2 布拉格條件.............................................................. 8
2.2 全像儲存系統.................................................................. 14
2.3 全像儲存用雷射之需求.................................................. 20
2.3.1 雷射二極體激發之固態雷射…………………….. 20
2.3.2 半導體DFB 雷射…………………………………. 21
2.4 全像儲存用材料之需求……………………………….. 24
2.4.1 光折變和光聚合物材料…………………………. 27
第三章 編碼原理……………………………………………... 29
3.1 全像儲存系統編碼之原因…………………………….. 29
3.2 錯碼率和訊雜比……………………………………….. 31
3.3 錯誤訂正碼…………………………………………….. 34
3.3.1 區塊碼………………………….. ………………... 35
3.3.2 循環碼…………………………………………….. 37
3.3.3 里德-所羅門碼…………………………………… 42
3.3.4 交錯……………………………………………….. 46
3.4 調變碼………………………………………………….. 48
3.4.1 平衡區塊編碼…………………………………… 48
3.4.2 低通編碼………………………………………… 51
3.5 等化處理和偵測……………………………………….. 52
3.5.1 等化處理………………………………………… 52
3.5.2 偵測……………………………………………… 53
第四章 新型灰階編碼之研究與各種編碼之測試…………... 55
4.1 新型灰階編碼…………………………………………. 55
4.1.1 新型灰階編碼之編解碼規則…………………… 55
4.1.2 新型灰階編碼之優缺點…………………………. 58
4.2 各種編碼之測試………………………………………. 60
第五章 結論………………………………………………….. 65
參考文獻………………………………………………………... 66
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指導教授 歐陽盟(Mang Ou-Yang) 審核日期 2007-7-26
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