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| 系統識別號 |
U0026-0812200914122072 |
| 論文名稱(中文) |
使用傳輸參考信號於超寬頻系統之通道估測與等化 |
| 論文名稱(英文) |
Channel Estimation and Equalization for Transmitted-Reference Ultra-Wideband Systems |
| 校院名稱 |
成功大學 |
| 系所名稱(中) |
電腦與通信工程研究所 |
| 系所名稱(英) |
Institute of Computer & Communication |
| 學年度 |
96 |
| 學期 |
2 |
| 出版年 |
97 |
| 研究生(中文) |
華文聖 |
| 研究生(英文) |
Wen-Sheng Hua |
| 電子信箱 |
q3695442@mail.ncku.edu.tw |
| 學號 |
q3695442 |
| 學位類別 |
碩士 |
| 語文別 |
英文 |
| 論文頁數 |
68頁 |
| 口試委員 |
口試委員-張志文
指導教授-張名先
口試委員-劉宗憲
口試委員-蘇賜麟
口試委員-賴癸江
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| 中文關鍵字 |
單載波頻域等化系統
最大可能性群集通道估測
遞迴式通道估測
傳輸參考信號
超寬頻系統
|
| 英文關鍵字 |
transmitted-reference (TR)
Ultra-wideband (UWB)
maximum-likelihood clustered channel estimation
recursive channel estimation
single-carrier frequency-domain equalization (SC
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| 學科別分類 |
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| 中文摘要 |
在近年來超寬頻(UWB)系統中，傳輸參考信號(TR)廣泛受到大家的歡迎與應用。主要原因在於接收機的考量。因為它不像犁耙式接收機(Rake receiver)，需要大量的閥(Tap)，以及完美的時間和通道響應在接收端。因此複雜度相對的較低，也比較切實際。對於傳輸參考信號之超寬頻(TR-UWB)系統，它的優點在於通道狀態資訊能夠非常直覺地從傳輸參考信號中獲得。但是一般的傳輸參考信號之超寬頻系統，為了能夠獲取較佳的系統效能，因此傳送大量的傳輸參考信號，導致降低系統的傳輸資料率。
在本論文中，首先我們討論一般傳統的傳輸參考信號之超寬頻系統。並且，我們也提出幾種遞迴式(recursive)通道估測與最大可能性群集通道估測(ML CCE)的方法來改善傳統的傳輸參考信號之超寬頻系統的問題。另外，我們也考慮此系統在單載波(SC)傳輸系統之中。針對具有符號間干擾(ISI)的情形，利用足夠的護衛區間(GI)與在頻域上運作等化的方式，來降低系統的複雜度。最後，也更進一步的將遞迴式通道估測的方法應用在此系統之中。
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| 英文摘要 |
Transmitted-reference (TR) signal is popularly used for ultra-wideband (UWB) systems recently. The main reason lies in the consideration in the receiver. Because it is not like Rake receiver, which needs a large amount of taps, and perfect timing and channel estimates in the receiver. Therefore, the complexity of the TR-UWB system is relative lower, and more feasible. For the ultra-wideband system with TR (TR-UWB), the receiver could readily estimate the channel state information from the TR. But for the typical TR-UWB system, we need to transmit a large number of TR signals in order to obtain better system performance, and this reduces data transmission rates of the system.
In this thesis, we first study the general TR-UWB system. Then we propose several approaches of recursive channel estimation and maximum-likelihood (ML) clustered channel estimation, such that we could obtain better performance using the same amount of TR. In addition, we consider single-carrier (SC) block transmission systems. To remove the inter-symbol interference (ISI), we use long enough guard interval (GI) and the low complexity frequency-domain equalization. Finally, we apply the method of recursive channel estimation to the SC block transmission with frequency-domain equalization.
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| 論文目次 |
Chinese Abstract Ⅰ
English Abstract Ⅱ
Acknowledgements Ⅲ
Contents Ⅳ
List of Figures Ⅵ
List of Tables Ⅸ
1. Introduction.......................................1
1.1 UWB systems....................................1
1.2 Single-Carrier System with Frequency-Domain Equalization..........2
1.3 Organization of this thesis....................3
2. Transmitted-Reference with UWB Systems.............4
2.1 UWB Channel Model..............................4
2.2 UWB Waveforms..................................11
2.2.1 Gaussian pulses..........................11
2.2.2 Hermite pulses...........................13
2.3 Transmitted-Reference with UWB Systems.........16
2.3.1 System Model and Signal Processing Mechanism.............16
2.3.2 Simulation Results.......................21
2.4 Recursive Channel Estimation Techniques for TR-UWB Systems...............23
2.4.1 System Model and Signal Processing Mechanism.............23
2.4.2 Simulation Results.......................29
2.5 Maximum-Likelihood Clustered Channel Estimation for TR-UWB Systems........34
2.5.1 System Model and Signal Processing Mechanism.............34
2.5.2 Simulation Results.......................37
2.6 Combine Recursive Channel Estimation with ML Clustered ChannelEstimation for TR-UWB Systems........39
2.6.1 System Model.............................39
2.6.2 Simulation Results.......................40
3. Single-Carrier Frequency-Domain Equalization for TR-UWB
Systems...............42
3.1 Single-Carrier System with Frequency-Domain Equalization for TR-UWB Systems.......................42
3.1.1 System Model and Signal Processing Mechanism.............42
3.1.2 Frequency-Domain Equalization............46
3.1.3 Channel Estimation.......................49
3.1.4 Simulation Results.......................50
3.2 Recursive Channel Estimation Techniques for TR-UWB with SC-FDE Systems......53
3.2.1 System Model and Signal Processing Mechanism.............53
3.2.2 Simulation Results.......................55
3.3 Channel Taps Selection for TR-UWB with SC-FDE Systems...............59
3.3.1 System Model and Signal Processing Mechanism.............59
3.3.2 Simulation Results.......................61
3.4 Combine Recursive Channel Estimation with Clusters ML ChannelEstimation for TR-UWB with SC-FDE Systems......63
3.4.1 System Model.............................63
3.4.2 Simulation Results.......................64
4. Conclusions........................................66
Bibliography..........................................67
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| 參考文獻 |
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