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研究生:吳煜彬 
研究生(外文):Yu-Pin Wu
論文名稱:高效分碼多工多用戶訊號檢測算法之研究
論文名稱(外文):Study on High Performance CDMA Multi-user Signal Detection Algorithms
指導教授:陳曉華陳曉華引用關係歐陽彥杰
指導教授(外文):Hsiao-Hwa ChenYen-Chieh Ouyang
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
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:162
中文關鍵詞:正交迴授判決檢測器耙形接收器多路徑效應適應性濾波器相等增益合成器最大比率合成器
外文關鍵詞:Orthogonal Decision Feedback DetectorRAKE receiverMultipath effectAdaptive filterMaximal ratio combiningEqual gain combining
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本論文主要是在探討使用領航訊號(pilot)輔助多用戶訊號的檢測系統之研究應用,並且探討適應性濾波器(adaptive filter)技術來對於時變通道的估測,使的這樣的接收器可以適用在時變衰弱的通道中。過去主要在研究多用戶檢測系統的分析,都只放在AWGN(Additive White Gaussian Noise )的CDMA通道,但是,由於近年來,行動通訊系統的服務要求日漸提升,使用行動電話通訊時,常常會遭遇到多路徑訊號的干擾以及通道訊號的衰減,因此,即時的通道響應來輔助訊號的檢測已經日漸變的重要。現今,大部分比較實用性的多用戶檢測的研究就會同時考慮通道的估測與訊號的檢測的結合,以pilot symbol或者是適應性濾波技術來進行通道估測以輔助訊號的檢測。
在本論文中,主要介紹四個部分,第二章介紹同步(synchronous)的系統中,使用獨立的領航訊號(lone pilot signal)輔助多用戶檢測系統的性能分析。第三章重心是放在如何把矩陣轉換省略掉且又不影響系統的效能,因此我們利用ODFD-QR的特性應用在使用獨立的領航訊號(lone pilot signal)輔助多用戶檢測系統的性能分析。第四章介紹對於通道的估測方面提出了比較符合實際的系統架構我們稱為WD-RAKE,使用適應性濾波技術,因為適應性濾波技術可有效對抗時變性通道的特性,而且它具有傳統RAKE接收機抗多重路徑干擾的特性。第五章為研究的結論與建議。

The thesis will discuss the subjects about the pilot assisted CDMA Multi-user system signal detection algorithms and applications. Finally we will present an adaptive receiver for CDMA communications over frequency-selective wireless channel. In the past years, primary studies on multi-user detectors concerned proposing some systems and analyzing them for additive white Gaussian noise CDMA channel. However, most of the multiple-access channels of interest. Consequently, a large amount of research has been focusing on proposing multi-user detectors to accommodate multi-path fading. Recently, more realistic multi-user detectors have been studied in which both detection and channel estimation using pilot symbol or adaptive filter are considered.
The rest of this thesis is organized as follow. In Chapter 2, we describe the lone pilot assisted the multi-user detector scheme for downlink CDMA systems. In Chapter 3, we use the ODFD-QR algorithm on our SCCS system without the inverse matrix. In Chapter 4, we describe the new receiver is termed the windows decorrelating-RAKE (WD-RAKE) receiver for its ability in decorrelating multiuser interference and combining self-adaptive filter advantage. In Chapter 5, we concludes the thesis with summary of results and remaining work.

中文摘要 .....................................................i
英文摘要 ....................................................ii
誌謝 ...................................................iii
目錄 ....................................................iv
圖目錄 ...................................................vii
表目錄 ..................................................xxix
第一章 導論 ................................................1
第二章 領航訊號輔助同步分碼多工多用戶檢測系統 ..............4
2.1概論 ....................................................4
2.2 Lone pilot assisted Same Code Cyclic Shift (SCCS).....5
Multi-user Detector system in multi-path channel
2.3 Lone pilot assisted Same Code Cyclic shift Multi-user Detector system with Extended Matrix (SCCS-EM) in multi-path channel......................................................11
2.4 Lone pilot assisted Same Code Cyclic shift Multi-user
Detector system with Decision Feedback in multi-path channel......................................................16
2.5 Lone Pilot Assisted Decorrelating Detector (DD) System in multi-path channel........................................18
2.6 Lone Pilot Assisted Rake Decorrelating Detector (RDD) in multi-path channel........................................21
2.7 不同系統性能比較 ....................................23
2.7.1 系統模擬環境 ....................................23
2.7.2 系統模擬結果 ....................................26
2.7.3 結果與討論 ......................................48
2.8 領航訊號輔助多用戶檢測系統的通道響應的碼組搜尋 ......50
2.8.1 概論 ............................................50
2.8.2 不同碼組,通過改變local code產生的 matrix的cndition number..............................................50
2.8.3 結果與討論 ......................................68
第三章 領航訊號輔助同步分碼多工多用戶檢測系統使用正交回授判決偵測器的應用.................................................69
3.1 概論 ................................................69
3.2 Orthogonal Decision-Feedback Detector (ODFD) Using QR-factorization................................................70
3.3 Lone Pilot Assisted Same Code Cyclic Shift Multi-User Detector System with ODFD (SCCS-ODFD) in Multi-Path Channel .....................................................75
3.4 Quasi-Extended matrix (QEM) .........................82
3.5 不同系統性能比較 ....................................85
3.5.1 系統模擬環境 ....................................85
3.5.2 系統模擬結果 ....................................86
3.5.3 結果與討論 .....................................109
第四章 適應性濾波技術的解相關耙型接收器與視窗型解相關耙型接收器..........................................................111
4.1 概論 ...............................................111
4.2 CDMA系統描述和離散時間的表示 .......................112
4.2.1 CDMA系統描述 ...................................112
4.2.2 CDMA系統離散時間的表示 .........................114
4.3 RAKE接收器 .........................................115
4.4 適應性濾波技術 .....................................117
4.4.1 線性適應性濾波技術 .............................117
4.4.2 最小均方演算法LMS(least mean square) ...........118
4.5 D-RAKE 接收器 ......................................122
4.6 ID-RAKE 接收器 .....................................126
4.7 WD-RAKE 接收器 .....................................129
4.8 不同系統性能比較 ...................................134
4.8.1 系統模擬環境 ...................................134
4.8.2 系統模擬結果 ...................................134
4.8.3 結果與討論 .....................................153
第五章 結論與建議 ........................................155
5.1 結論 ...............................................155
5.2 建議 ...............................................157
參考文獻 ...................................................158
附錄 .......................................................161

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[4] Lei Wei, Student Member, IEEE, and Christian Schlegel, Member, IEEE : “Synchronous DS-SSMA System with Improved Decorrelating Decision-Feedback Multi-user Detection “, IEEE Transactions on Vehicular Technology, vol. 43, no. 3 August 1994.
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[16] S. L. Miller, “Training analysis of adaptive interference suppression for direct-sequence CDMA system,” IEEE Trans. Commun., vol. 44, pp 488-495, Apr. 1996.
[17] Suehiro, N. “A signal design without co-channel interference for approximately synchronized CDMA systems,” Selected Areas in Communications, IEEE Journal on , vol. 12, pp.837 -841, June 1994.
[18] Chih-Hsuan Tang; Wei-Yun Chang; Che-Ho Wei. “Pilot channel aided adaptable interference cancellation scheme for uplink DS/CDMA mobile radio systems,” Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE, vol. 5, pp. 3163 -3167, 2001.
[19] Tsung-Hsien Liu. “Appproximate bit error robability calculation of decision-feedback linear multiuser detectors,” Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE , vol. 2 , pp. 851 -855, 2001.
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