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研究生： 陳昱丞
Yu-Cheng Chen
論文名稱： DVB-T數位電視廣播之脈衝雜訊消除
Impulse Noise Suppression for DVB-T System
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
Department of Communication Engineering
畢業學年度： 95
語文別： 中文
論文頁數： 91
中文關鍵詞： 數位電視廣播 、脈衝雜訊
外文關鍵詞： Impulse noise, DVB-T
相關次數： 點閱：22  下載：0 
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    • 脈衝雜訊為一種出現時間短但能量很強的干擾訊號，其來源可能是開關電器產品或者使用過程中所發出。在實際的通訊系統中脈衝雜訊通常會造成整個收到的訊號失真，且如果接收到的訊號進行解調處理時需要使用之前時間的訊號，脈衝雜訊會連帶影響到後來收到訊號的品質。
    在歐規數位電視廣播（DVB）中，針對脈衝雜訊定義六種不同測試訊號[2]。本篇論文研究內容在不同規格參數的歐規數位電視廣播環境下，分別加入六種不同測試訊號進行脈衝雜訊的偵測與消除。
    本論文先針對偵測脈衝雜訊部分：一般偵測方法與本論文提出偵測方法進行說明；接著針對脈衝雜訊消除：一般消除方式、S. V. Zhidkov於2003年於IEEE提出之方法、本論文提出之最小平方法（LS, Least Square）與尋找量化階取代（SOQL, Search Over Quantization Level）逐一進行說明。最後將各種偵測與消除脈衝雜訊方法進行模擬，由模擬結果可知使用本論文提出之偵測與消除脈衝雜訊方法可以有效降低脈衝雜訊對系統的影響。

    Impulse noise is a kind of noise with short duration and strong interference. It comes from switching on/off electric appliances or the duration of using them. In practical communication system, impulse noise usually causes received signal to distort. If received signal needs the former signal to demodulate the instant signal, impulse noise will influence the later signal.
    DVB specification defines six different test patterns[2] for impulse noise. This thesis research content is simulation on different DVB-T specification with these test patterns.
    This thesis first talks about impulse noise detection including convention algorithm, proposed algorithm and then talks about impulse noise cancellation including convention algorithm, S. V. Zhidkov proposed algorithm, this thesis proposed algorithms Least Square (LS) and Search Over Quantization Level (SOQL). By simulating all these algorithm can find that proposed algorithm can effective reduce influence of impulse noise.

    中文摘要 i 英文摘要 ii 誌謝 iii 目錄 iv 圖目錄 vi 表目錄 x 第一章 概論 1 1.1 研究動機與背景 1 1.2 研究方法 1 1.3 章節簡介 2 第二章 DVB-T 數位電視地面廣播系統簡介 4 2.1 OFDM簡介 4 2.2 DVB-T系統規格與參數 8 2.2.1 DVB-T系統介紹 8 2.2.2 DVB-T訊框結構 9 2.2.3 DVB-T參考訊號 12 第三章 脈衝雜訊簡介 16 3.1 脈衝雜訊對單載波系統與正交分頻多工系統的影響 16 3.2 脈衝雜訊模型 18 3.2.1 DVB 脈衝雜訊測試訊號 18 3.2.2 伯努力－高斯脈衝雜訊模型 22 3.2.3 帕松－高斯脈衝雜訊模型 25 3.3 脈衝雜訊產生方式 25 第四章 脈衝雜訊偵測與消除方式 26 4.1 脈衝雜訊偵測 26 4.1.1 脈衝雜訊位置檢測法 26 4.1.2 進階脈衝雜訊位置檢測法 29 4.2 脈衝雜訊消除 34 4.2.1 一般消除脈衝雜訊方式 34 4.2.1.1 非線性截波法 35 4.2.1.2 非線性歸零法 37 4.2.2 Sergey V. Zhidkov提出之消除脈衝演算法 38 4.2.3 自行提出之消除脈衝雜訊演算法 40 4.2.3.1 最小平方法 40 4.2.3.2 尋找量化階取代法 46 第五章 電腦模擬與結果分析 53 5.1 脈衝雜訊參數分析 53 5.1.1 脈衝雜訊位置檢測法門檻值 53 5.1.1.1 第一次使用衝雜訊位置檢測法之門檻值 53 5.1.1.2 第二次使用脈衝雜訊位置檢測法之門檻值 58 5.1.2 移動平均長度 59 5.1.3 輸出訊號雜訊比之門檻值 60 5.1.4 尋找量化階取代法量化階選擇 61 5.2 各種消除脈衝雜訊方法之比較 63 5.2.1 脈衝雜訊位置已知 64 5.2.2 脈衝雜訊位置未知 66 5.2.3 不同消除脈衝雜訊方法對系統效能的影響 73 第六章 結論與未來研究方向 75 參考文獻 76

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