臺灣博碩士論文加值系統

數位電視是這幾年非常熱門的話題，歐洲電信標準組織(ETSI)所制定的地面波標準(DVB-T)至今已被許多國家廣泛使用，也包括台灣在內。有鑑於數位電視之重要性，而目前實作之文獻較少，故本論文依照DVB-T (ETSI EN 300 744)之規範，將通道解碼及解變的技術以軟體方式實現，建立接收機相關知識。我們利用數位電視機上盒擷取目前現有的數位電視之中頻訊號，自行撰寫相關程式進行解碼，包括取樣頻率轉換、正交分頻多工的同步與解調變、通道估測與等化，以及解交錯、腓特比解碼器、里德索羅門解碼器…等。我們解碼進行到最後，可得到MPEG-2 Transport Stream，並且利用影音播放軟體播放其聲音及影像，確認程式之正確性。

The digit TV has become a hot topic in recent years. The European standard for digital video broadcasting over terrestrial(DVB-T) has already been adopted by a lot of countries, including Taiwan. To understand the technical details of the standard (ETSI EN 300 744), we decide to implement the DVB-T demodulator and channel decoder in software. We use existing DVB-T set-top box to get its intermediate frequency (IF) signal, which is digitized and stored in a PC. The program we write includes the following functions: sampling rate conversion, synchronization and demodulation for orthogonal frequency division multiplexing(OFDM), channel estimation and equalization, de-interleaving, Viterbi decoding, and Reed-Solomon decoding, etc. We finally obtain a MPEG-2 Transport Stream (TS). The TS can be decoded using a commercial media player. Thus, the correctness of our program is fully verified

中文摘要 i
英文摘要 ii
誌 謝 iii
目 錄 iv
表目錄 v
圖目錄 vi

第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 章節編排 3
第二章 歐規數位電視通道編碼及調變原理 4
2.1 MPEG-2 TS 5
2.2 亂碼器 7
2.3 外部編碼 8
2.4 外部交錯 10
2.5 內部編碼 11
2.6 內部交錯 13
2.6.1 位元交錯器 13
2.6.2 符元交錯器 14
2.7 正交分頻多工 17
2.8 傳輸參數信號 22
2.9 訊框架構 25
第三章 訊號同步與通道估測 30
3.1 符元同步 30
3.2 頻率同步 32
3.3 最大相似演算法 37
3.4 通道估測與等化 39
第四章 軟體實現數位電視接收機 42
4.1 實驗系統架設 42
4.2 數位處理前端 44
4.3 訊號同步 50
4.4 通道解碼 58
4.5 實驗結果 64
第五章 結論與未來展望 67
5.1 結論 67
5.2 未來展望 68
參考文獻 69

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