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研究生： 嚴國釗
Kuo-Chao Yen
論文名稱： DVB-T數位電視廣播訊號接收平台製作與其行動接收訊號分析
DVB-T Digital Television Broadcast Signal Reception Platform Build and its Action Analysis of Received Signal
指導教授： 陳逸民
Yih-Min Chen
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系在職專班
Executive Master of Communication Engineering
畢業學年度： 99
語文別： 中文
論文頁數： 76
中文關鍵詞： 數位電視廣播訊號接收平台製作與其行動接收訊號分析
外文關鍵詞： Digital Television Broadcast Signal Reception Pl
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    • 數位地面視訊廣播系統(DVB-T)，採用的是編碼正交分頻多工(COFDM)技術。正交分頻多工是一種多載波的調變方式，將資料分散到各個不同的頻率且互相正交的次載波。其具有高效率的頻譜使用率、高速率傳輸、對抗頻率選擇的通道衰減及抵抗多重路徑干擾…等等優異特性。在許多的研究中都是假設干擾，產生合理的干擾源，去模擬各類真實通道環境下的接收訊號。而本篇論文主要在論述DVB-T訊號錄製平台建置，在校正其接收器基本效能後，透過此平台錄下真實環境中所接收到的數位電視基地台信號，分析其各種響應，並藉由程式輔助分析來呈現理論與真實環境之差異。

    Digital terrestrial video broadcasting system (DVB-T) uses a coded orthogonal frequency division multiplexing (COFDM) technology. Orthogonal Frequency Division Multiplexing is a multi-carrier modulation. Its data are spread to different frequencies and mutually orthogonal subcarriers. It has high efficiency of spectrum utilization, high rate transmission, against the selected channel frequency attenuation and resistance to multi-path interference, etc. characteristics of merit. In many studies it is assumed that there are interference and resulting in a reasonable source of interference, to simulate the real environment of the receiver channel signal. This thesis describes how to build DVB-T signal recording platform, and after correction of its basic performance of the receiver, through this platform to record the real environment of the received digital television base station signals, analyze the various responses, and by supporting analysis of the program to render the differences between theory and real.

    中文摘要 I 英文摘要 II 致 謝 III 目 錄 IV 圖 目 錄 ..VI 第一章 緒論 1 1.1 簡介 1 1.2 研究動機與流程 2 1.3 各章提要 3 第二章 數位電視地面廣播系統簡介 4 2.1 OFDM簡介 4 2.1.1 OFDM調變原理 5 2.1.2 保護區間與循環延展(Cyclic extension) 8 2.2 DVB-T 系統簡介 10 2.2.1 DVB-T系統架構 11 2.2.2 訊框結構 12 2.2.3 DVB-T參考訊號 14 2.2.4 DVB-T接收機架構 16 第三章DVB-T訊號錄製平台簡介 17 3.1系統架構 17 3.2 Tuner + A/D converter硬體介紹 18 3.3 FPGA Board硬體介紹 21 3.3.1 FPGA控制界面 22 3.4 平台軟體開發 23 3.4.1 FPGA程式設計 24 3.4.2 USB界面程式設計 24 3.4.3 Visual Studio視窗控制程式設計 25 第四章 接收訊號校正及實錄訊號分析 27 4.1接收功率及接收平台感度校正 28 4.2實錄信號分析 31 4.2.1 行動信號功率分析 31 4.2.2 數位降頻及帶通取樣分析 32 4.2.3 再取樣器、費洛濾波器分析 34 4.2.4 Delay Correlator 及時序同步分析 35 4.2.5 小數點頻率偏移分析 37 4.2.6 整數頻率偏移分析 39 4.2.7 通道估測分析 42 4.2.8 信號重建 43 第五章 行動接收訊號實錄分析 45 5.1 標準信號與行動信號之通道響應比對 45 5.1.1標準信號與行動信號Subcarrier通道響應 45 5.1.2 標準信號與行動信號Symbol之通道響應 45 5.2 行動接收信號在不同速度下之通道響應 47 5.3 行動接收信號在不同速度下之特定Subcarrier通道響應 48 5.4 行動接收信號在不同內插法下之信號重建 49 5.5 不同接收環境下之行動接收信號實測分析 54 5.5.1 基地台間之單頻網效應 55 5.5.2 不同位置之通道響應量測 57 第六章 結論及未來發展 62 參考文獻 63

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