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研究生:施伯勳
研究生(外文):Po Hsun Shih
論文名稱:在DVB-T系統中基於最小平方法之通道估測
論文名稱(外文):Channel Estimation by Least-Square Algorithm for DVB-T system
指導教授:高永安高永安引用關係
指導教授(外文):Y. A. Kao
學位類別:碩士
校院名稱:長庚大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2016
畢業學年度:104
語文別:中文
論文頁數:47
中文關鍵詞:DVB-T通道估測LS通道估測法
外文關鍵詞:DVB-Tchannel estimationLS channel estimation
相關次數:
  • 被引用被引用:1
  • 點閱點閱:179
  • 評分評分:
  • 下載下載:23
  • 收藏至我的研究室書目清單書目收藏:0
本論文是在數位廣播系統(DVB-T)中討論散射型領航訊號及連續型加上散射型領航訊號兩種方法,比較在時變通道下LS通道估測法的差異。當通道延遲較大時,LS估測法有矩陣接近奇異的問題,將會造成LS估測法對雜訊異常敏感而使得LS估測法效能變差。我們將利用連續型加上散射型領航訊號以及修正參數解決矩陣接近奇異的問題。
In this paper, we discussed in digital video broadcasting (DVB-T) system. Consider two cases: (1) only the scattered pilot; and (2) scattered pilot plus continuous pilot. We will discuss their differences in LS channel estimation method under the time-variant channel. If the maximum channel delay is large, there is a nearly singular matrix problem when a receiver adopts the frequency domain LS (FDLS) method to estimate the data subcarrier channel frequency response. This problem renders FDLS channel estimation more sensitive to noise. We will discuss difference modified parameter, in order to solve the problem of singular matrix in the LS estimation method.
目錄
指導教授推薦書…………………………………………………………..
口試委員會審定書………………………………………………………..
誌謝……………………………………………………………………iii
中文摘要………………………………………………………………...iv
英文摘要………………………………………………………………....v
目錄……………………………………………………………………vi
圖目錄………………………………………………………………..viii
表目錄………………………………………………………………...….x
第一章 序論……………………………………………………………..1
1.1研究背景…………………………………………………………1
1.2研究動機…………………………………………………………1
1.3論文架構…………………………………………………………3
第二章 OFDM系統與DVB-T規格簡介………………………………4
2.1 OFDM系統……………………………………………………...4
2.2 OFDM之優缺點………………………………………………...7
2.3 都卜勒頻率偏移………………………………………………..8
2.4 DVB-T系統………………………………………………….…11
第三章 通道估測………………………………………………………16
3.1領航訊號擺設方式……………………………………….……16
3.2常見的通道估測方法………………………………………….19
3.3最小平方法(Least Squares)介紹………………………………22
3.4頻域LS估測法……………………………………………..…23
第四章 通道模型與系統模擬……………………………………..….27
4.1 通道模型…………………………………………………...….27
4.2 系統模擬………………………………………………………33
第五章 結論與未來展望…………………………………………..….42
參考文獻……………………………………………………………..…43

圖目錄
圖2.1-1、傳統FDM系統與OFDM系統頻帶使用比較圖.......................4
圖2.1-2、OFDM系統方塊圖 7
圖2.1-3、循環字首示意圖 7
圖2.3-1、交通工具與基地台S有相對速度的情形..............................10
圖2.3-2、訊號相同時間到達不同角度進入示意圖.............................10
圖2.3-3、 都卜勒偏移功率頻譜密度示意圖.......................................11
圖2.4-1、DVB-T系統方塊圖 13
圖2.4-2、DVB-T規格中散射型領航訊號示意圖................................14
圖3.1-1、梳狀型排列示意圖 17
圖3.1-2、梳狀型排列示意圖 18
圖3.1-3、散射型排列示意圖 19
圖3.2-1、以領航訊號通道響應做線性內插示意圖.............................21
圖3.4-1、散射型和連續型pilot在不同通道延遲下誤差能量比較圖.25
圖4.1-1、Jakes模型的功率頻譜密度...................................................31
圖4.1-2、Gauss I模型的功率頻譜密度................................................32
圖4.1-3、Gauss I模型的功率頻譜密度................................................32
圖4.2-1、M=40及=1時,不同SNR對BER的曲線圖...................34
圖4.2-2、M=40及=0.01時,不同SNR對BER的曲線圖..............35
圖4.2-3、M=60及=1時,不同SNR對BER的曲線圖...................35
圖4.2-4、M=60及=0.01時,不同SNR對BER的曲線圖..............36
圖4.2-5、M=40及=1時,不同SNR對BER的曲線圖...................37
圖4.2-6、M=40及=0.01時,不同SNR對BER的曲線圖..............38
圖4.2-7、M=60及=1時,不同SNR對BER的曲線圖...................38
圖4.2-8、M=60及=0.01時,不同SNR對BER的曲線圖..............39
圖4.2-9、M=80及SNR=10時,連續型領航訊號不同對BER的曲 線圖 40
圖4.2-10、M=80及SNR=10時,散射型加上連續型領航訊號不同對BER的曲線圖 40
圖4.2-11、M=80及SNR=30時,連續型領航訊號不同對BER的曲線圖 41
圖4.2-12、M=80及SNR=30時,散射型加上連續型領航訊號不同對BER的曲線圖 41

表目錄
表一、DVB-T規格表 13
表二、DVB-T散射型領航訊號對應子載波位置表.............................14
表三、一個符元中連續型領航訊號所在子載波位置表......................15
表四、COST 207中的 Typical Urban 6 通道模型...............................30
表五、COST 207中的Bad Urban 12通道模型....................................30
表六、COST 207中三種典型的功率頻譜密度 .........................31

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