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研究生:黎耀傑
研究生(外文):Chieh-Yao Li
論文名稱:分碼多工存取系統中的新式盲蔽多用戶通道估測技術
論文名稱(外文):Two New Blind Multiuser Channel Estimation Techniques for Code Division Access Systems
指導教授:劉宗憲劉宗憲引用關係
指導教授(外文):Tsung-Hsien Liu
學位類別:碩士
校院名稱:國立中正大學
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:2002
畢業學年度:90
語文別:中文
論文頁數:76
中文關鍵詞:盲蔽式程序通道估計相關雜訊分碼多工存取多用戶檢測多重存取干擾智慧型天線
外文關鍵詞:Blind channel estimationcorrelated noiseCDMAmultiuser detectormultiple access interferencesmart antenna
相關次數:
  • 被引用被引用:0
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  • 下載下載:16
  • 收藏至我的研究室書目清單書目收藏:0
近年來,無論是在同步或是非同步的分碼多重存取系統中,盲蔽式通道估計方法已經被廣泛的使用。這些盲蔽式通道估計方法都是利用信號子空間和雜訊子空間會正交的特性而衍生出來的方法。但這類的技術要求得子空間就必須要透過特徵值分解(eigenvalue decomposition, EVD)或是奇異值分解(singular value decomposition, SVD)這類的演算法,這些演算法帶來龐大的運算複雜度,造成不易實現的問題,即使近年來G. Xu和T. Kailath已提出有效率且簡單的快速子空間分解(fast subspace decomposition, FSD)來取代傳統的分解方式。因此我們提出新的方式,類似智慧型天線中估計信號來源方向(DOA)的技術,可以不用透過特徵值分解或是奇異值分解演算法,即可估算出通道響應的參數。我們比較傳統, Capon,和子空間為基礎三種盲蔽通道估計方法的效能表現。在白色高斯雜訊的環境下,Capon的盲蔽通道估計方法的效能表現和子空間為基礎的盲蔽通道估計方法相似,而傳統的盲蔽通道估計方法的效能表現是較差的。在相關雜訊(correlated noise)的環境下,一般利用子空間特性的盲蔽式通道估計方法將無法使用在這類的環境下,而其他兩種方法沒有這方面的限制。

Recently, in synchronous or asynchronous CDMA systems, blind channel estimation has been used widely. These blind channel estimation methods exploit orthogonal property between the signal and noise subspace, which are obtained from computationally expensive eigenvalue decomposition (EVD) of the sample correlation matrix or singular value decomposition (SVD) of the sample data matrix. In this thesis, we propose two blind channel estimation methods, motivated by the direction of arrival (DOA) estimation methods in smart antenna, both of which avoid EVD or SVD. We compare the performance of three blind channel estimation methods : the conventional, Capon's, and subspace-based methods. In the white noise environment, the advantage of conventional method is low computational complexity, but its performance is poorer than the other two methods. Capon's method is not only of low computational complexity but also of performance similar to the subspace-based method. In particular, conventional method works very poor against multiple access interference (MAI), and the performance of the other two methods are fine. In the correlated noise environment, the conventional and subspace-based methods are inferior to Capon's method.

1 導論 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 動機. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 論文架構 . . . . . . . . . . . . . . . . . . . . . . . . 7
2 分碼多重存取系統與通道模型架構 8
2.1 分碼多重存取系統的描述與離散時間表示式. . . . . . . . . . 8
2.1.1 CDMA系統的連續時間表示式. . . . . . . . . . . . . . . . 8
2.1.2 CDMA系統的離散時間表示式 . . . . . . . . . . . . . . . 13
2.1.3 展頻法則 . . . . . . . . . . . . . . . . . . . . . . . 15
2.1.4 差分相位鍵移和差分編碼法則 . . . . . . . . . . . . . . 16
2.2 非時變多路徑衰退通道 . . . . . . . . . . . . . . . . . . 18
2.2.1 衰退通道 . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.2 干擾雜訊 . . . . . . . . . . . . . . . . . . . . . . . 22
2.3 接收器的設計 . . . . . . . . . . . . . . . . . . . . . . 24
2.3.1 Zero-Forcing Receiver . . . . . . . . . . . . . . . . 25
2.3.2 Linear MMSE Receiver . . . . . . . . . . . . . . . . . 29
3 盲蔽式通道估計技術 34
3.1 智慧型天線 DOA-method 簡介. . . . . . . . . . . . . . 34
3.2 利用子空間正交特性來估算通道參數 . . . . . . . . . . . . 37
3.3 利用相關矩陣來估算通道參數 . . . . . . . . . . . . . . . 45
3.4 利用相關矩陣的倒數來估算通道參數 . . . . . . . . . . . . 46
3.5 盲蔽通道估計技術的複雜度 . . . . . . . . . . . . . . . . 47
4 實驗模擬與結果分析 50
4.1 參數與環境設定 . . . . . . . . . . . . . . . . . . . . . 50
4.2 模擬與結果 . . . . . . . . . . . . . . . . . . . . . . . 51
5 結論與未來工作 67
Reference . . . . . . . . . . . . . . . . . . . . . . . . . 68
中英文名詞對照表 . . . . . . . . . . . . . . . . . . . . . . 71

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