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研究生:蔡矅倫
研究生(外文):Yao-Lun Tsai
論文名稱:FMT無線傳輸系統之原型濾波器設計
論文名稱(外文):Prototype Filter Design for Wireless Filtered Multitone Transmission System
指導教授:魏學文魏學文引用關係
指導教授(外文):Shyue-Win Wei
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:通訊工程研究所
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:2008
畢業學年度:96
語文別:中文
論文頁數:198
中文關鍵詞:FMTOFDM原型濾波器濾波器組碼際干擾子通道干擾頻譜包含程度都卜勒偏移效應
外文關鍵詞:FMTOFDMPrototype filterFilter bnakICISpectral containmentDoppler shift effect
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在FMT (Filtered multitone) 傳輸系統中,原型濾波器(Prototype filter)的選取與設計會大幅影響其傳輸效率與性能表現。本論文主要針對FMT系統在無線多路徑快速衰減通道下之原型濾波器設計進行最佳化研究,從碼際干擾(Intersymbol interference,ISI)與子通道干擾(Interchannel interference,ICI ),Overhead以及都卜勒偏移效應(Doppler shift effect)抵抗能力等條件下來設計出最適合於高速無線傳輸環境下的FMT系統。採用本論文所設計的原型濾波器,FMT系統可以有效避免子通道干擾和都卜勒偏移效應並且同時可以維持極佳的頻譜效益。本文使用COST207無線通道模型來驗證FMT系統在無線通訊上的效能表現,本論文更進一步計算FMT與正交分頻多工系統(Orthogonal Frequency Division Multiplexing, OFDM)的系統傳輸容量的差異性,並驗證FMT系統只需少量的子通道在無線通訊上即可維持相當OFDM的傳輸容量。
The transmission capacity and anti-fading capability of FMT (Filtered multitone) transmission system are closed related to the selection of prototype filter. The aim of this thesis is to optimize the design procedure of the FMT prototype filter under wireless multi-path fading channel. A design procedure is presented to choose good prototyping filter under the criteria of inter-carrier interference (ICI) minimization and overhead minimization. The thesis also presented a cut-off frequency reduction method to overcome the Doppler frequency shift due to high mobility so that the FMT can be applied on very fast fading channels, such as the high-speed rail system. Transmission capacity of the FMT system is also analyzed and compared to the conventional orthogonal frequency division multiplexing (OFDM) system. We verify that the FMT system can maintain a transmission capacity as large as the OFDM system but with much small number of subchannels.
誌謝 I
中文摘要 II
英文摘要 III
目次 IV
圖目次 VI
表目次 XII
第一章 前言 1
第二章 無線傳輸通道模型 4
2-1無線傳輸通道介紹 4
2-2大範圍衰減模型與小範圍衰減模型 6
2-3無線通道時散特性 8
2-4無線通道時變特性 11
2-5 COST 207通道模型[12][13] 15
第三章 FMT信號與模型 21
3-1正交分頻多工系統介紹 22
3-2 FMT系統介紹 30
3-2-1 多重相位濾波器(Polyphase filter)[14] 31
3-2-2 濾波器組(Filter Bank)[15][16] 47
3-2-3 FMT系統調變技術的有效率實現架構 54
3-3 FMT和OFDM系統之比較 62
第四章原型濾波器的選擇與設計 69
4-1原型濾波器的參數定義 70
4-1-1原型濾波器ISI定義 70
4-1-2原型濾波器SINR定義 72
4-1-3原型濾波器overhead定義 73
4-2目前考慮之原型濾波器種類 73
4-2-1理想低頻濾波器搭配窗形函數 74
4-2-2方根餘玄濾波器搭配窗形函數 78
4-2-3 Cherubini’s coaster function濾波器搭配窗形函數 79
4-3原型濾波器之選擇 81
4-3-1從時域上選擇合適的原型濾波器 81
4-3-2從頻域上選擇合適的原型濾波器 83
第五章 在高速移動下之FMT原型濾波器設計 84
5-1 FMT系統對抗都卜勒偏移效應方式 84
5-1-1傳統FMT系統使用K>M方法 84
5-1-2 內縮截止頻率方法 85
5-2 在高速移動下原型濾波器的選擇 86
5-3 系統通道傳輸容量 103
5-3-1 OFDM系統傳輸容量 104
5-3-2 FMT系統傳輸容量 108
5-3-3 FMT與OFDM系統傳輸容量比較 111
第六章 結論 123
參考文獻 124
附錄A:FMT各種原型濾波器之性能比較 126
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