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研究生:陳聰岳
研究生(外文):Chen, Tsung-Yueh
論文名稱:各式轉換於多載波系統之效能評估
論文名稱(外文):Performance Evaluation of DMT Systems with Commonly-Used Orthogonal Transforms
指導教授:馮世邁
指導教授(外文):See-May Phoong
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2001
畢業學年度:89
語文別:英文
論文頁數:88
中文關鍵詞:多載波多載波非對稱數位用戶迴路
外文關鍵詞:DMTDiscrete multitoneADSL
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近年來, 多載波調變系統被廣泛應用於各種領域, 如: 行動通訊, 數位廣播, 與數位用戶迴路等等. 多載波調變系統通常以離散傅利葉轉換來實現. 在這篇論文中, 我們介紹傳統多載波調變系統 (conventional DFT-based DMT system) 與 修改型多載波調變系統 (modified DFT-based DMT system). 另外, 我們提出一般化的多載波調變系統 (general DMT system), 在這種系統中, 不再侷限只能用離散傅利葉轉換, 而我們更可以使用其他的正交轉換, 如: 離散餘弦轉換 (DCT), 離散正弦轉換 (DST), 與Walsh-Hadamar轉換 (WHT)…等等. 此外, 我們可以減小這種系統的冗餘性. 在這篇論文中, 我們使用各多載波系統在非對稱數位用戶迴路 (ADSL) 環境下作其效能的評估.

Recently the discrete multitone modulation (DMT) systems have been widely used in many applications such as mobile communications, digital broadcasting, and digital subscriber loops. The DMT systems that have often been implemented are DFT-based DMT systems. In this thesis, we introduce the conventional DFT-based DMT system and the modified DFT-based DMT system. The obvious difference is the cyclic prefix in the former and zero padding in the latter. We develop the general DMT system. In the general DMT system, we can apply any orthogonal matrices such as DCT, DST, and WHT, not restrict to DFT. We can reduce the redundancy in the general DMT system. In this thesis we carry out our simulation over the ADSL environment.

Chapter 1 Introduction 1
Chapter 2 ADSL Environment 5
2.1 Asymmetric Digital Subscriber Line (ADSL) 5
2.2 Channel Model 7
2.3 Noise 11
Chapter 3 DMT Systems 17
3.1 Filter Bank Interpolation of DMT Systems 18
3.1-1 DMT Systems over Ideal Channel 18
3.1-2 DMT Systems over a Frequency Selective Channel 21
3.1.3 Polyphase Representation 22
3.2 Conventional DFT-based DMT System 27
3.2-1Implementation of IDFT and DFT Block 29
3.2-2 Cyclic Prefix Insertion 30
3.3 Modified DFT-based DMT System 31
3.4 Bit Allocation 33
3.4-1 Optimal Bit Allocation 34
3.4-2 Nonnegative Inter Bit Allocation 38
Chapter 4 DMT Systems with General Orthogonal Matrices 39
4.1 General DMT System 40
4.2 General DMT System with Reduced Redundancy 42
4.3 Commonly-Used Orthogonal Matrices 46
4.3-1 Discrete Fourier Transform (DFT) 47
4.3-2 Discrete Cosine Transform (DCT) 48
4.3-3 Discrete Sine Transform (DST) 50
4.3-4 Walsh-Hadamard Transform (WHT) 51
Chapter 5 Simulation Results and Discussions 55
5.1 Simulation Environment 55
5.1-1 Time Domain Equalizer (TEQ) 56
5.1-2 PAM and QAM 59
5.2 Simulation on Conventional and Modified DFT-based DMT
Systems 62
5.2-1 Number of Subchannels 62
5.2-2 Cyclic Prefix/Zero Padding Length 68
5.3 Simulation on DMT Systems with General Orthogonal Matrice 71
5.4 Simulation on General DMT Systems with Reduced Redundance 79
Chapter 6 Conclusions 85
References 87

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