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研究生:劉家良
研究生(外文):Chia-Liang Liu
論文名稱:具迴授的寬帶廣義旁波帶消除器之研究
論文名稱(外文):Studies on Broadband Generalized Sidelobe Canceller with Decision Feedback
指導教授:李彥文李彥文引用關係
指導教授(外文):Yinman Lee
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:2010
畢業學年度:98
語文別:中文
論文頁數:53
中文關鍵詞:廣義旁波帶消除器決策迴授最小均方法
外文關鍵詞:Generalized Sidelobe CancellerDecision FeedbackLeast-mean-square
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智慧型天線是一種使用多根天線所組成的天線陣列來接收訊號,由於在空間中會存在著許多不同使用者的傳輸訊號,因此接收到的訊號除了包含該使用者希望接收到的訊號之外也包含著其他方向進來的干擾訊號,我們將使用波束形成的技術來解決這個問題,在這邊我們使用的架構為廣義旁波帶消除器(Generalized Sidelobe Canceller, GSC),對欲求訊號可適性地調整波束,將我們想要接收的訊號經過之後能夠維持最大的增益,並盡可能去抑制干擾訊號與雜訊。然而在現今無線通訊的蓬勃發展下,隨著對通訊品質的提升與傳輸速率的要求,伴隨而來的也有許多難題要解決,如空間中最常見的多重路徑干擾。因此,在這篇論文中,我們將在第一部分中去探討廣義旁波帶消除器的概念,並加入決策迴授(Decision Feedback)的概念,並在第二部份將可適性具迴授之廣義旁波帶消除器(Generalized Sidelobe Canceller with Decision Feedback, DF-GSC)的架構進而套用在寬帶系統中以解決無線通訊中的問題,而在此論文中,我們探討的寬帶訊號分別為四位元相位鍵移調變(Quadrature Phase-shift Keying, QPSK)、正弦波訊號(sinusoid)、以及自迴歸模型(Autoregressive Model, AR model)[17]所產生的訊號,從中我們可以看到DF-GSC能有有效克服傳統可適性GSC強健上的不足以及收斂速度的缺點。在此篇論文中,我們將看到智慧型天線的空間濾波器特性所帶來的好處。
Smart antenna is an antenna array system which consists of several antenna elements for processing the received signal. Since there usually exists a number of signal sources in the communication environment, the received signal may contain interference from other spatial directions and the desired signal can be degraded. Here, we consider to employ beamforming techniques to overcome this problem. The structure of generalized sidelobe canceller (GSC) is used to adaptively steer to the received signal, maximize the signal power and suppress the interference and noise as well. Also note that in modern wireless communication systems, the demand for better quality of service (QoS) and higher data rate are ever increasing. A number of issues are then induced, including the multipath propagation effect. In this thesis, we investigate the use of the GSC with decision feedback (DF) to deal with all these problems. We not only study the adaptation of this DF-GSC, but also extend it to work over broadband communication channels. The signals used in the discussion include the quadrature phase-shift keying (QPSK) signal, continuous sinusoid wave, and autoregressive (AR) model generated signal. We show that the proposed adaptive DF-GSC can provide very robust performance and improve the convergence speed at the same time. All these demonstrate the effectiveness of applying the smart antenna technique.
誌謝 I
中文摘要 II
ABSTRACT III
目錄 IV
圖目錄 V
表目錄 VII
第一章 前言 1
第二章 窄帶天線陣列之訊號處理 3
2.1 訊號模型 4
2.2 廣義旁波帶消除器 6
2.2.1 天線陣列系統架構 6
2.2.2 廣義旁波帶消除器基本概念 7
2.3 可適性的廣義旁波帶消除器 12
2.4 決策迴授的廣義旁波帶消除器 15
2.5 模擬結果 19
第三章 寬帶天線陣列之訊號處理 22
3.1 分接延遲線濾波器 22
3.2 寬帶可適性廣義旁波帶消除器 24
3.3 具迴授的寬帶可適性廣義旁波帶消除器 30
3.4 連續波之訊號分析 36
3.5自迴歸模型之訊號處理 38
3.6模擬分析 40
第四章 結論與未來展望 51
參考文獻 52
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[15] S. S. Narayan and A. M. Peterson, ‘‘Frequency domain least-mean-square algorithm,’’ Proc. IEEE, vol. 69, pp. 124-126, Jan. 1981.
[16] Yinman Lee and Wen-Rong Wu, “A Robust Adaptive Generalized Sidelobe Canceller with Decision Feedback,” IEEE Trans. Antennas and Propagation, vol. 53, pp. 3822-3832, Nov. 2005
[17] Shengkui Zhao, Zhihong Man, Suiyang Lhoo, and H. R. Wu, “Stability and Convergence Analysis of Transform-Domain LMS Adaptive Filters with Second-Order Autoregressive Process,” IEEE Trans. Signal Processing, vol. 57, pp. 119-130, Jan. 2009
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