臺灣博碩士論文加值系統

在通訊系統中因通道多路徑衰減(Multipath fading)將會造成符號間干擾。本論文中採用平方時脈恢復(Square Timing Recovery)方法取得正確的時脈，設計過的載波頻率恢復器(Carrier Recovery)子系統作載波頻率錯誤補償，線性最小均方差的等化器(Linear LMS Equalizer)將通道間的符號間干擾消除，可同時處理載波相位補償，使其作信號星座圖收斂的同時也作反相位旋轉。最後以Matlab/Simulink的模擬工具分析通道衰減對時脈以及載波頻率的錯誤影響。

In the communication systems, the channel multipath fading will cause Inter-symbol interference (ISI). In this thesis, the Square Timing Recovery is used to get correct Timing. The design of carrier recovery subsystem is used to compensate the frequency error. However, the convergence of the output constellation from system is not satisfactory. Therefore, we use the Linear Least Mean Square equalizer as last stage to overcome the constellation convergence problem and compensate carrier phase error. Finally, analysis of channel fading on the timing and carrier frequency error effects in Matlab/Simulink simulation toolbox.

中文摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第1章 緒論 1
1.1 研究動機與背景 1
1.2 章節概要 1
第2章 傳送端系統架構簡介 2
2.1 系統架構 2
2.2 根升餘弦濾波器與頻率轉換 3
2.2.1 根升餘弦濾波器 3
2.2.2 頻率轉換 4
2.3 Simulink 模擬系統傳送端架構 7
2.3.1 傳輸端模組 8
第3章 接收端設計考量 12
3.1 接收端基本架構 12
3.1.1 接收端基本架構 12
3.1.2 Simulink接收端模組 14
3.2 時脈偏移恢復 16
3.2.1 時脈偏移 16
3.2.2 時脈恢復演算法 19
3.2.3 Simulink平方時脈估計恢復子系統 20
3.3 載波頻率恢復 21
3.3.1 載波頻率/相位偏移 21
3.3.2 載波頻率恢復演算法 23
3.3.3 Simulink 載波頻率恢復子系統 24
3.4 多路經通影響 27
3.4.1 多路徑通道延遲干擾 27
3.4.2 線性LMS等化器 28
3.4.3 Simulink LMS 等化器子系統 30
第4章 實驗結果數據分析 36
4.1 多路徑的影響 36
4.2 頻率偏移結果比較 38
4.2.1 頻率偏移估計 I 38
4.2.2 載波頻率估計 II 58
4.3 載波頻率雜訊分析 69
4.3.1 載波回復雜訊分析 69
第5章 結論 85
參考文獻 86

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