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研究生:顏健益
研究生(外文):Chien-Yi Yen
論文名稱:非同步多路徑干擾通道中自適應性分碼多工多用戶檢測
論文名稱(外文):Adaptive CDMA Multiuser Detection in Asynchronous Multipath Channels
指導教授:陳曉華陳曉華引用關係
指導教授(外文):Hsiao-Hwa Chen
學位類別:碩士
校院名稱:國立中山大學
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:2004
畢業學年度:92
語文別:中文
論文頁數:225
中文關鍵詞:最小均方演算法遞迴最小平方演算法分碼多工多用戶檢測適應性
外文關鍵詞:RAKERLSBlindLMSAdaptiveCDMA
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本文分析是在非同步多路徑通道下,介紹一種可以應用於CDMA多用戶檢測的技術(Multi-user Detection),主要是根據Wiener濾波器以及去相關檢測器的概念相似性,建構出適應性去相關橫向檢測器。再利用LMS以及RLS演算法在Wiener濾波器中的適應性,來取代傳統的去相關檢測器中的反矩陣運算,以減少系統的計算量。
並且我們主要考量到系統是建構在非同步多路徑通道下,故系統的設計方向是以非同步通道為主要考量。假設我們已經知道通道的路徑延遲以及路徑增益,我們利用了前一個所得到的權值來做為我們現在所判決權值的參考資訊。接著我們考慮到使用RAKE接收機來增加系統的效能。由於在非同步多路徑通道下,最常使用RAKE接收機來抵抗多路徑的干擾,因此我們根據RAKE接收機的概念改變了系統架構,由模擬曲線中也可以發現,使用RAKE接收機的系統的確可以有效的提升了系統再非同步多路徑通道下時的性能。最後,根據其他論文所提出的Blind多用戶檢測的系統架構,可以發現我們的系統也可以適用於Blind的多用戶檢測。
The analysis of this thesis concerns various problems associated with adaptive CDMA multi-user detection in asynchronous multi-path channels. Starting with some simple concept of Wiener filtering and correlating detector, we construct a novel adaptive decorrelating transversal filter suitable for CDMA multi-user detection in uplink channels. Then, we make use of the LMS and RLS algorithms to replace the traditional decorrelating transversal filter (which is also called inverse matrix based decorrelating detector) to make the scheme work fully adaptively. In this way, a great advantage in terms of computation load reduction is made possible.
To further improve the detection efficiency, we will also make use of RAKE receiver to enhance the overall decision reliability in the proposed adaptive CDMA MUD scheme. Although the focus of this thesis is put on analysis, we will also use computer simulations to counter-check the results obtained from theoretical analysis, showing a very good match between the two.
In the last part of the thesis, we will also discuss the various issues on fully blind implementation of the proposed adaptive CDMA MUD scheme with some useful multipath channel delay and amplitude estimation algorithms.
第一章 導論
1.1 研究動機
1.2 論文架構
第二章 去相關橫向濾波器及適應性演算法
2.1 概要
2.2 去相關檢測器(Decorrelating Detector)及Wiener濾波器
2.3 去相關橫向濾波器(Decorrelating transversal filter)
2.4 最小陡坡演算法(Steepest Descent Algorithm)
2.5 最小均方演算法 (Least-Mean-Square Algorithm, LMS)
2.6 遞迴最小平方演算法 (Recursive Least-Squares, RLS)
2.7 使用LMS演算法於去相關橫向濾波器
第三章 非同步無多路徑通道下,去相關橫向濾波器之分析
3.1 通道模型
3.2 非同步無多路徑通道下,去相關橫向濾波器之系統架構
3.3 非同步無多路徑通道下,使用LMS演算法於去相關橫向濾波器
3.4 非同步無多路徑通道下,使用RLS演算法於去相關橫向濾波器
3.5 結論及分析
第四章 非同步多路徑通道下,去相關橫向濾波器之分析
4.1 通道模型
4.2 未使用RAKE接收機之系統架構
4.4 在RAKE接收機下之系統架構
4.5 在RAKE接收機下,使用LMS演算法去相關橫向濾波器
4.5.1 RAKE接收機的錯誤率分析
4.5.2 使用LMS演算法於去相關濾波器分析
4.6 結論及分析
4.6.1 未使用RAKE接收機之結果分析
4.6.2 使用EGC RAKE接收機之結果分析
4.6.3 使用MRC RAKE接收機之結果分析
第五章 Blind多用戶檢測及通道參量對系統之影響分析
5.1 概要
5.2 Blind多用戶檢測
5.3 延遲估測
5.4 路徑增益估測
第六章 結論
6.1 結論
6.2 在非同步多路徑通道下,適應性LMS去相關檢測器與並行干擾消除器之比較
附錄 Appendix
A. 局部非週期互相關函數(partial aperiodic crosscorrelation)
A.1 局部非周期互相關函數
A.2 分析
參考文獻
[1] S. Haykin, “Adaptive Filter Theory”, 3rd Ed., Prentice Hall, 1996.
[2] R. Lupas and S. Verdu, “Near-Far Resistance of Multi-User Detectors in Asynchronous Channels,” IEEE Trans. Commun., vol. 38, no. 4, Apr. 1990, pp. 496-508.
[3] R. Lupas and S. Verdu, “Linear Multi-User Detectors for Synchronous Code-Division Multiple-Access Channels,” IEEE Trans. Info. Theory, vol. 35, no. 1, Jan. 1989, pp. 123-36.
[4] Z. Xie, R. T. Short, and C. K. Rushforth, “A Family of Suboptimum Detectors for Coherent Multi-User Communications,” IEEE JSAC, vol. 8, no. 4, May 1990, pp. 683-90.
[5] Xiaoming Xue; Tjeng Thiang Tjhung, “Multistage channel estimation with LMS parallel interference cancellation for asynchronous DS-CDMA in frequency-selective Rayleigh channels”, Signal Processing and its Applications, Sixth International, Symposium on. 2001 , Volume: 2 , 13-16 Aug. 2001, pp. 406-409.
[6] Guoqiang Xue; Jianfeng Weng; Le-Ngoc, T.; Tahar, S., “Adaptive multistage parallel interference cancellation for CDMA”, Communications, 1999. ICC ''99. 1999 IEEE International Conference on , vol. 2, 6-10 June 1999, pp. 917 -921.
[7] Del Re, E.; Fantacci, R.; Morosi, S.; Pugi, A.; ”Advanced blind adaptive multi-user detector for communications in nonstationary multipath fading channel” Vehicular Technology, IEEE Transactions on , Volume: 50 , Issue: 6 , Nov. 2001 ,Pages:1497 – 1506
[8] Mucchi, L.; Morosi, S.; DelRe, E.; Fantacci, R.; “A New Algorithm for Blind Adaptive Multiuser Detection in Frequency Selective Multipath Fading Channel” Wireless Communications, IEEE Transactions on , Volume: 3 , Issue: 1 , Jan. 2004 ,Pages:235 – 247
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[16] 國立中山大學通訊工程研究所91學年度碩士論文 吳奇峰 “適應性分碼多工多用戶檢測”.
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