博碩士論文 985203021 詳細資訊




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姓名 劉瀚升(Han-sheng Liu)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 針對WLAN OFDM系統之I/Q不平衡與載波頻率偏移補償與其電路設計與實現
(Design and Implementation of Joint IQ Imbalance and Carrier Frequency Offset Compensation for WLAN OFDM Systems)
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摘要(中) 正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM) 技術,已經廣泛使用於現代的無線網路實體層中,在射頻電路的架構方面,直接轉換接收機(Direct-conversion) 也越來越受到廣泛的使用,因其具備低成本與小面積等優點。伴隨著此結構容易受到射頻元件與震盪電路的誤差帶來IQ 不平衡(IQ Imbalance)、直流偏移(DC Offset) 與載波頻率偏移(Carrier Frequency Offset) 等問題,降低接收機性能。因此在本篇論文,提出了使用訓練符元以最小平方(Least square) 做參數估計,達到在無線區域
網路系統中快速同步的目的,並且較現有演算法有更好的效能。最後,基於我們的演算法提出同步電路架構,並以VHDL 撰寫RTL 驗證我們的電路結構效能。
摘要(英) Orthogonal Frequency Division Multiplexing (OFDM) is a widely used technique in the physical layer of modern communication system. Unfortunately,OFDM system is sensitive to imperfect synchronization and non-ideal front-end effects such as IQ Imbalance, DC Offset and carrier frequency offset, leading to serve system performance degradation. In this thesis, we consider recovering the WLAN OFDM signals in the presence of these imperfect conditions, we propose least-square (LS) equalization for Joint IQ Imbalance and carrier frequency offset estimation. From computer simulation results, the proposed algorithm has better performance than existing algorithms. Finally, the VHDL Design is used to verity the feasibility in electric circuit structure.
關鍵字(中) ★ 直接轉換接收器
★ 正交分頻多工系統
★ IQ不平衡
★ 載波頻率偏移
關鍵字(英) ★ OFDM
★ IQ Imbalance
★ IQ Mismatch
★ Carrier frequency offset
★ Direct Conversion
論文目次 目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . .II
表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . .IV
第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . 3
第2 章系統模型. . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 OFDM 系統簡介. . . . . . . . . . . . . . . . . . . . . . .5
2.2 I/Q Imbalance 效應. . . . . . . . . . . . . . . . . . . . 8
2.3 系統與訊號模型. . . . . . . . . . . . . . . . . . . . . .12
2.4 IQ 不平衡在OFDM 系統上的影響. . . . . . . . . . . . . . .17
第3 章IQ 不平衡與載波頻率偏移估計補償. . . . . . . . . . . . 23
3.1 在IQ 不平衡情形下之載波頻率偏移估計法. . . . . . . . . . 23
3.1.1 IQ 不平衡情形下的載波頻率偏移估計法一. . . . . . . . . 26
3.1.2 IQ 不平衡情形下的載波頻率偏移估計法二. . . . . . . . . 28
3.2 已有的結合IQ 不平衡/載波頻率偏移參數估計與補償法. . . . .31
3.2.1 IQ-CFO compensation scheme in time domain . . . . . . 32
3.2.2 Least-square based Joint Estimation in time domain . . 35
3.2.3 Decision-Directed Estimation in frequency domain . . . 38
3.2.4 minimization Channel Residual Energy in time domain. . 39
3.3 所提出的結合IQ 不平衡/載波頻率偏移參數估計與補償法. . . .42
3.3.1 改良Least-square based 演算法. . . . . . . . . . . . . 43
3.3.2 minimization Channel Residual Energy . . . . . . . . . 48
第4 章系統模擬與分析. . . . . . . . . . . . . . . . . . . . .52
4.1 系統模擬參數與環境. . . . . . . . . . . . . . . . . . . .52
4.2 模擬結果. . . . . . . . . . . . . . . . . . . . . . . . .53
4.2.1 載波頻率偏移估計. . . . . . . . . . . . . . . . . . . .54
4.2.2 IQ 不平衡估計. . . . . . . . . . . . . . . . . . . . . 57
4.3 結合IQ 不平衡與載波頻率偏移估計. . . . . . . . . . . . . 60
4.3.1 系統效能比較. . . . . . . . . . . . . . . . . . . . . .63
第5 章硬體的架構與設計. . . . . . . . . . . . . . . . . . . .66
5.1 接收機系統架構介紹. . . . . . . . . . . . . . . . . . . .66
5.2 各演算法的模組電路架構設計. . . . . . . . . . . . . . . .68
5.2.1 最小平方誤差估計模組. . . . . . . . . . . . . . . . . .68
5.2.2 IQ 不平衡估計使用minimization Channel Residual Energy 76
5.2.3 IQ 不平衡與載波頻率偏移補償模組. . . . . . . . . . . . 84
5.3 各模組電路定點數分析. . . . . . . . . . . . . . . . . . 87
5.4 MATLAB/Modelsim 整合驗證. . . . . . . . . . . . . . . . 91
5.5 FPGA 電路合成報告. . . . . . . . . . . . . . . . . . . .100
第6 章結論. . . . . . . . . . . . . . . . . . . . . . . . . 105
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . 106
附錄A:CORDIC 演算法. . . . . . . . . . . . . . . . . . . . 110
附錄B:混合式CORDIC 演算法. . . . . . . . . . . . . . . . . 113
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指導教授 張大中(Dah-Chung Chang) 審核日期 2011-8-24
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