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研究生：	華文聖 Hua, Wen-Sheng
論文名稱：	使用傳輸參考信號於超寬頻系統之通道估測與等化 Channel Estimation and Equalization for Transmitted-Reference Ultra-Wideband Systems
指導教授：	張名先 Chang, Ming-Xian
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電腦與通信工程研究所 Institute of Computer & Communication Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	英文
論文頁數：	68
中文關鍵詞：	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
外文關鍵詞：	transmitted-reference (TR), Ultra-wideband (UWB), maximum-likelihood clustered channel estimation, recursive channel estimation, single-carrier frequency-domain equalization (SC
相關次數：	點閱：183 下載：2
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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。

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.

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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校內：2010-07-01公開
校外：2011-07-01公開

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