臺灣博碩士論文加值系統

本篇論文對整個美規數位電視系統(Advanced Television Systems Committee；ATSC)的傳輸與接收做完整的介紹。由於數位電視系統解碼效能主要取決於通道等化的效果，故針對數位電視接收機之決策回授等化器使用least-mean square (LMS)、recursive-least square (RLS)、stop-and-go algorithm (SAG)、constant modulus algorithm (CMA) 以及提出新的modified stop-and-go algorithm (MSAG) 等演算法做模擬分析與比較。為更精準提高接收機接收訊號的品質，我們設計使用威特比解碼器為決策回授等化器之決策裝置以取代傳統的直接決策方式。模擬數據映證提出的演算法與決策回授等化器的新架構在解碼效能上獲得良好的改進。

A complete study of the transceiver design for ATSC DTV is presented in this thesis. Since the performance of the ATSC DTV receiver mainly depends on the equalizer, several adaptive filtering algorithms, including LMS, RLS, SAG, CMA, and the proposed modified SAG are investigated for compact for compact the signal distortion.
To further improve the decision quality, a modified Viterbi decoder is used to be the decision device in the decision feedback equalizer. Computer simulation demonstrates that the proposed modified SAG algorithm and new DFE architecture can achieve performance improvement in the ATSC DTV system.

中文摘要 .................................................i
英文摘要 ................................................ii
致謝 ...................................................iii
目錄 ....................................................iv
表目錄 ..................................................iv
圖目錄 ..................................................vi

第一章 緒論 .............................................1
1.1 電視數位化 .....................................1
1.2 陸地數位電視廣播系統簡介 .......................2
1.2.1 美規ATSC系統 .............................2
1.2.2 歐規DVB-T系統 ............................3
1.2.3 日規ISDB-T系統 ...........................4
1.3 章節提要 .......................................5
第二章 ATSC數位電視系統 .................................6
2.1 數位電視系統概要 ...............................6
2.2 ATSC數位電視系統傳輸原理 .......................9
2.3 ATSC發射端編碼系統 ............................13
2.3.1 資料雜散器 ..............................13
2.3.2 里德所羅門編碼器 ........................14
2.3.3 資料交織器 ..............................15
2.3.4 格子編碼器 ..............................16
2.3.5 場同步與段同步...........................19
2.3.6 導頻、殘旁波帶調變與升頻轉換 ............20
2.4 ATSC接收端解碼系統 ............................21
2.4.1 等化器 ..................................21
2.4.2 威特比解碼器 ............................22
2.4.3 解交織器 ................................25
2.4.4 里德所羅門解碼器 ........................26
2.4.5 解雜散器 ................................26
第三章 適應性決策回授等化器 ............................27
3.1 決策回授等化器 ................................27
3.2 模擬系統模型 ..................................30
3.3 適應性演算法 ..................................32
3.3.1 最小均方(LMS)演算法 .....................32
3.3.2 遞回最小平方(RLS)演算法 .................33
3.3.3 定值模數(CMA)演算法 .....................34
3.3.4 停止與前進(SAG)演算法 ...................35
3.3.5 改良式停止與前進(MSAG)演算法 ............36
3.4 決策回授等化器使用威特比解碼 ..................37
3.5 改良式決策回授等化器 ..........................38
第四章 模擬與結果 ......................................42
4.1 收斂特性 ......................................44
4.2 等化器與格子解碼器之符碼錯誤率 ................70
第五章 結論 ............................................79
參考文獻

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