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研究生:陳冠宇
研究生(外文):Kuan-Yu Chen
論文名稱:基於Alamouti空間-時間區塊碼系統中之新型交叉決策迴授廣義旁瓣消除器
論文名稱(外文):A New Cross Decision Feedback GSC-Based Receiver in Alamouti Space-Time Block Coded Systems
指導教授:方文賢
指導教授(外文):Wen-Hsien Fang
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
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:2008
畢業學年度:96
語文別:中文
論文頁數:55
中文關鍵詞:多使用者偵測多重輸入多重輸出直序分碼多工調變系統Alamouti空間-時間區塊碼交叉迴授廣義旁瓣消除器決策迴授干擾抑制
外文關鍵詞:multiuser detectionMIMO-CDMAAlamouti space-time block codeCross Decision FeedbackGSCdecision feedbackinterference suppression
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在本論文, 我們發展出一套建構在Alamouti空間-時間區塊碼技術下的多
重輸入多重輸出的直序碼多工調變系統中之高效能交叉決策迴授廣義旁瓣消
除器的多使用者偵測器解調器。
為了提升傳統空間-時間區塊碼系統的多使用者偵測效能, 我們在根據最
小均方誤差的法則下, 提出了以廣義旁瓣消除器作為偵測器的接收系統, 此系
統優點為能夠有效率的擷取天線陣列系統的空間多樣性特質以及使用分碼多
工的時間特性。
為了更有效率的使用空間-時間區塊碼的傳輸訊號特性, 我們更進一步提
出了一個新的交叉迴授機制, 其可以藉著把估測出的訊號, 迴授到廣義旁瓣消
除器的輸出端, 這樣能使欲解調的訊號在經過廣義旁瓣消除器中的阻擋矩陣
的作用之後, 能夠再更進一步使得解調器輸出的訊號更貼近所欲得到的訊號,
因此能夠使得抑制干擾的能力做再進一步的提升。另外,我們對新型系統的效
能上做了理論上的分析, 所獲得的結果, 也能獲得新型的系統確實有著較好的
效能。
最後, 我們對所提出的交叉決策迴授的偵測系統, 進行電腦模擬與效能分
析, 而實驗的結果也顯示出我們所提出的新系統比原始的系統以及加上了決
策迴授後的系統, 有更好的效能以及更快的收斂速度。
This paper proposes a simple, yet effective generalized sidelobe canceller (GSC)-
based Capon multiuser receiver for the Alamouti space-time block coded (STBC)
multiple-input multiple-output code-division multiple-access (MIMO CDMA) systems.
The new receiver makes full use of the space diversity provided by the
antenna array and the time diversity provided by the decision feedback (DF) from
the outputs of both of GSCs employed along with the transmit diversity induced
in the Alamouti STBC to render superior performance . With an ingenious DF
scheme, refer to as the the cross DF (CDF), the desired signals will be blocked more
thoroughly after the blocking matrix so that the interference suppression capability
can be further enhanced. Performance analysis is also provided to show that that
the minimum mean squared error (MMSE) of the receiver using the CDF is indeed
lower than those with or without the classical DF scheme. Conducted simulations
show that the new receiver can not only provide superior performance compared
with previous works, but it can also render faster convergence characteristics.
第一章緒論1
1.1 引言. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 研究動機與目的. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 內容章節概述. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
第二章相關技術回顧8
2.1 多輸入多輸出系統. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 直序分碼多工調變存取資料模型. . . . . . . . . . . . . . . . . . . 10
2.3 多使用者偵測器. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3.1 最佳化接收器. . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3.2 次佳化線性接收器. . . . . . . . . . . . . . . . . . . . . . . 13
2.3.3 線性限制最小方差偵測器. . . . . . . . . . . . . . . . . . . 16
2.4 調適性多使用者偵測器. . . . . . . . . . . . . . . . . . . . . . . . 18
2.4.1 調適性最小均方誤差偵測器. . . . . . . . . . . . . . . . . 18
2.4.2 最佳化廣義旁瓣消除器. . . . . . . . . . . . . . . . . . . . 20
2.5 決策迴授廣義旁瓣消除器. . . . . . . . . . . . . . . . . . . . . . . 22
2.6 結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
第三章空間-時間區塊碼傳送接收系統下之交叉決策迴授廣義旁
瓣消除偵測器26
3.1 時間-空間系統訊號模型. . . . . . . . . . . . . . . . . . . . . . . . 26
3.2 交叉決策迴授廣義旁瓣消除器. . . . . . . . . . . . . . . . . . . . 30
3.3 效能分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.3.1 均方誤差效能分析. . . . . . . . . . . . . . . . . . . . . . . 38
3.3.2 運算複雜度分析. . . . . . . . . . . . . . . . . . . . . . . . 40
3.4 結語. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
第四章模擬結果與討論43
4.1 模擬環境設定. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.2 模擬結果及討論. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3 結語. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
第五章結論及未來展望51
5.1 結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 未來展望. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
參考文獻.....................................................................53
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