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研究生：	蘇漢添 Su, Han-Tien
論文名稱：	頻域等化之單載波及超寬頻系統 Single-Carrier and UWB Systems with Frequency-Domain Equalization
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：	2005
畢業學年度：	93
語文別：	英文
論文頁數：	45
中文關鍵詞：	單載波、超寬頻、頻域等化
外文關鍵詞：	Single-Carrier, UWB, Frequency-Domain Equalization
相關次數：	點閱：111 下載：2
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　　未來無線通訊系統必須提供高資料傳輸率的服務去滿足下一代無線通訊網路的需求。然而，對於高資料傳輸率使著通道呈現嚴重的頻率選擇性(frequency selective)。傳統的時域上等化可能變為不實際的作法，因為隨著通道的記憶性或是非常長的有限脈波響應(FIR)濾波器而增加複雜度去達到可接受的性能。

　　在本論文中，介紹頻域上等化的方法應用在單載波(Single- Carrier)、分碼多工(CDMA)與分碼多工超寬頻(CDMA UWB)系統上。在頻域上使用最小平方平均誤差(MMSE)和強制歸零(ZF)的等化，可以利用快速傅利葉轉換(FFT)運算降低等化的複雜度。再進一步，使用最小平方通道估測(Least-Square Fitting channel estimation)的方法。

　In the future, wireless communication systems must provide high data rate services to satisfy the increasing needs of the next-generation wireless communications networks. However, for high data rate transmission, the channel is severely frequency-selective due to the presence of many interfering paths with different time delays. Conventional equalization in the time domain may become impractical because its complexity grows with channel memory or requires very long FIR filters to achieve acceptable performance.

　In thesis, we introduce an approach to apply frequency domain equalization (FDE) in the Single-Carrier (SC), CDMA and CDMA UWB systems. By performing the MMSE and ZF equalizations in the frequency domain, the complexity of the equalization can be significantly reduced with the FFT operation. Further, we present a least-square-fitting channel estimation method for SC/FDE. The performance of the SC/FDE system is evaluated with perfect and least-square-fitting channel estimation techniques.

Chinese Abstract..............................................Ⅰ
English Abstract..............................................Ⅱ
Acknowledgements..............................................Ⅲ
Contents......................................................Ⅳ
List of Figures...............................................Ⅶ
List of Tables..............................................ⅩⅠ
Introduction................................................1
1 Single-Carrier System with Frequency-Domain Equalization...1
2 UWB System with Frequency-Domain Equalization..............2
3 Organization of this thesis................................3
Single-Carrier System with Frequency-Domain Equalization....4
1 Channel Model..............................................4
1.1 The Modified Jakes’ Model...............................4
1.2 Simulation Results.......................................5
2 Frequency-Domain Equalization..............................7
3 Single-Carrier System with Frequency-Domain Equalization...9
3.1 Simulation Results......................................10
4 Channel Estimation........................................11
4.1 Least-Square-Fitting Channel Estimation.................11
4.2 Simulation Results......................................13
5 CDMA System with Frequency-Domain Equalization............16
5.1 Simulation Results......................................19
UWB System with Frequency-Domain Equalization..............20
1 UWB Channel Model.........................................20
1.1 The Modified Saleh-Valenzula Model......................20
1.2 Simulation Results......................................22
        3.1.2.1 CM1...................................................22
        3.1.2.2 CM2...................................................26
        3.1.2.3 CM3...................................................30
        3.1.2.4 CM4...................................................33
1.3 Simulation Results of Channel Characteristics...........37
2 CDMA UWB System with Frequency-Domain Equalization........38
2.1 Simulation Results......................................40
Conclusions................................................43
                                    

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[12] Z. Wang, X. Ma and G.. B. Giannakis, “OFDM or Single-Carrier Block Transmissions?,” IEEE Trans. Commun., vol. 52, no. 3, pp. 380–394, Mar 2004.

校內：2007-06-27公開
校外：2007-06-27公開

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