博碩士論文 975203048 詳細資訊




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姓名 徐智亨(Chih-Heng Hsu)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 在行動單載波頻域等化器通訊系統中以決策迴授方法消除子載波間干擾
(A Decision Feedback ICI Cancellation Method for Mobile SC-FDE Communications)
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摘要(中) 在單載波頻域等化器通訊系統中,在傳送端與接收端有較高的相
對移動速度情況下,多路徑通道會随著每一個取樣點而改變,於是會降低子載波間的正交性,在接收端的等化器會因子載波間干擾造成效能降低。為了消除子載波間干擾效應,在本篇論文中我們提出了一個可以利用決策訊號回授疊代系統,搭配決策迴授子載波間干擾消除等化器來消除子載波間的干擾。又由於估計出越精確的通道脈衝響應能使決策迴授子載波間干擾消除等化器達到越好的效果,所以我們使用了延展型卡爾曼濾波器與非察覺型卡爾曼濾波器來追蹤通道脈衝響應。最後的模擬結果顯示我們提出的方法在行動單載波頻域等化器通訊系統中能有效的消除子載波間干擾的效應。
摘要(英) In a single-carrier frequency domain equalizer (SC-FDE) system, the time-varying multipath channel can destroy the orthogonality among the subcarriers as the transmitter and the receiver have high relative speed. The intercarrier interference (ICI) phenomenon leads to severe performance degradation. To eliminate the effect of ICI, we propose an iterative decision feedback ICI cancellation equalizer (DFIC) in combination with a decision feedback channel estimation scheme. Since the accurate estimate of the channel impulse response (CIR) can achieve better performance of the DFIC, we consider the extended Kalman filter and the unscented Kalman Filter to estimate the CIR from the nonlinear channel model. Simulation results show that the proposed algorithm can effectively reduce the ICI effect and improve the performance of the SC-FDE system in a time-varying channel.
關鍵字(中) ★ 子載波間干擾
★ 單載波頻域等化器
關鍵字(英) ★ intercarrier interference
★ SC-FDE
論文目次 目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II
表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III
第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
第2 章SC-FDE 行動通道系統模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
第3 章子載波間干擾消除方法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 DFIC 等化器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 前饋濾波器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 迴授濾波器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 利用疊代消除ICI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5 利用LMS 疊代修正DFIC 係數. . . . . . . . . . . . . . . . . . . . . . . . . . 20
第4 章領航訊號排列方式與通道估測方法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 領航訊號排列方式. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2 時域延展型卡爾曼濾波器通道追蹤法. . . . . . . . . . . . . . . . . . . . . 24
4.3 時域非察覺型卡爾曼濾波器通道追蹤法. . . . . . . . . . . . . . . . . . . 28
4.4 利用LS 估測通道追蹤初始值. . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.5 通道預測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
第5 章模擬與分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.1 系統及通道模型參數. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.2 模擬結果. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.2.1 參考附近子載波數q 值討論. . . . . . . . . . . . . . . . . . . . . . . . . 36
5.2.2 預測通道參考取樣數討論. . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.3 通道預測對於系統效能的影響. . . . . . . . . . . . . . . . . . . . . . . 40
5.2.4 不同通道追蹤方法效能比較. . . . . . . . . . . . . . . . . . . . . . . . . 42
5.2.5 系統疊代次數討論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.2.6 通道追蹤收斂性討論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.2.7 DFIC 等化器利用LMS 收斂最佳情形次數討論. . . . . . . . . 48
5.2.8 與其他方法比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2.9 不同rt 的比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
第6 章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
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指導教授 張大中(Dah-Chung Chang) 審核日期 2010-8-18
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