博碩士論文 91523040 詳細資訊




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姓名 曾凡碩(Fan-Shuo Zeng)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 正交分頻多工系統中之方位角估測及應用在接收器之設計
(An Angle of Arrival Estimation Algorithm for OFDM Systems and Applications to Receiver Designs)
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摘要(中) 此篇論文提供一個存在強干擾信號的正交分頻多工系統中估測信號多重路徑到達角度的方法,此方法主要是以特徵分解的方式來建構信號空間給估測角度演算法來偵測角度,然後我們將此角度估測結果應用於廣義天線旁瓣消除器(GSC)接收器的設計。在此所提供的接收器與最小均方錯誤接收器比較,可得其並不需要知道使用者的訓練序列(training sequence),如此可以增加資料輸出量,這是因為廣義天線旁瓣消除器接收器用到達方位角估測的資訊來取代訓練序列。而且我們使用多級威能濾波器(MSWF)運用在廣義天線旁瓣消除器上來增加追蹤能力和減少運算複雜度,並且在信號進入廣義天線旁瓣消除器接收器前提供一個信號處理的機制來增加接收效能。我們可從電腦模擬結果得知上述的方法所得到的效能結果。
摘要(英) This thesis proposed an eigenanalysis-based method for constructing signal space to estimate Angle-Of-Arrival in OFDM communication systems. After DOA estimation, we use the application as the constraints of the GSC receiver. The proposed receiver doesn’’t need user’’s training sequence compared to MMSE receiver that decrease data throughput. This is because that the GSC receiver utilizes the DOA estimation to replace the information of the training data. And then we use the MSWF which is one of the reduced rank filters to the GSC to increase tracking ability and reduce the computation complexity. Moreover, processing the signal before applying the signal vector to GSC is superior to none of pre-processing scheme. The performance results indicate that proposed method outperforms the Generalized Sidelobe Cancelers (GSC) with classical Weiner filter under less observation data. We can see the performance results by simulations.
關鍵字(中) ★ 正交分頻多工系統
★ 方位角估測
★ 接收機之設計
關鍵字(英) ★ OFDM
★ receiver design
★ AOA
★ DOA
論文目次 List of Figure II
List of Table IV
Chapter1 Introduction 1
§ 1.1 The Motivation of the research 1
§ 1.2 Foreword 3
§ 1.3 Organization 5
§ 1.4 Abbreviations 6
Chapter 2 Fundamental Concepts 8
§2.1 Channel Model In Wireless Communication 8
§2.1.1 Types of small-scale Fading 9
§2.2 OFDM WLAN Overview 11
§2.2.1 Basic OFDM model 14
§ 2.3 Standard ESPRIT 16
§ 2.4 Unitary ESPRIT 22
§ 2.5 Multi-Stage Wiener Filter 24
§ 2.5.1 An Equivalent Wiener Filtering Model 25
§ 2.5.2 A Multistage Representation of the Wiener Filter 29
§2.6 The Generalized Sidelobe Canceller (GSC) 33
Chapter 3 System model 38
§3.1 The OFDM signal model for M antennas 38
§3.2 The constructed signal space for DOA estimation 41
§3.3 Receiver Design with Multistage Wiener Filter 47
§3.3.2 The GSC with MSWF receiver 48
§3.4 The CRB of the DOA estimation 53
Chapter 4 Simulations 60
§4.1 The simulation parameters of OFDM system 60
§4.2 Simulation result of the DOA estimation 60
§4.3 Simulation result of MSWF 67
Chapter 5 Conclusions 73
References 74
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指導教授 陳永芳(Yung-Fnag Chen) 審核日期 2004-7-8
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