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研究生:張益瑋
研究生(外文):Yi-Wei Jhang
論文名稱:用於多輸入多輸出正交分頻多工通訊系統之適應性通道估測等化與CFO補償接收機
論文名稱(外文):Adaptive Channel estimation/equalization and CFO compensation receiver for MIMO OFDM communication systems
指導教授:翁芳標翁芳標引用關係
指導教授(外文):Fang-Biau Ueng
口試委員:王忠炫鄭立德
口試委員(外文):Chung-Hsuan WangLi-Der Jeng
口試日期:2015-07-28
學位類別:碩士
校院名稱:國立中興大學
系所名稱:通訊工程研究所
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:2015
畢業學年度:103
語文別:英文
論文頁數:69
中文關鍵詞:正交分頻多工系統適應性演算法適應性接收機載波間干擾載波間干擾取消卡門通道估測空間頻率區塊編碼
外文關鍵詞:OFDMadaptive algorithmsadaptive receiversintercarrier interferenceICI cancellationKalman channel estimationspace time block coding(STBC).
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在本論文中,為了在空時區塊碼(STBC)和多輸入多輸出正交分頻多工(MIMO-OFDM)裏有效率的使載波間干擾(ICI)取消,我們使用一個適應性的接收器且在發射端用兩個路徑的共軛傳輸來組合整個系統。在接收器的設計是依據相位旋轉共軛取消(PRCC)的概念介紹,我們可以稱為修改PRCC方法的適應性接收機。此外,通道估測對於多輸入多輸出正交分頻多工的系統效能有很關鍵的影響。我們使用卡爾曼濾波器去追蹤通道。最初的通道估計是從稀疏的引導訊號來被執行。資料檢測、解碼和通道基於所估計的傳輸資料被重新估測直到收斂。我們用標準的最大載波干擾比推出最佳化相位旋轉,並且發展了一個適應性標準化的最小均方演算法去達到理想結果。在接收端有這樣自適應的相位旋轉,使載波頻率偏移(CFO)在通道的影響和發射端與接收端震盪器間的不匹配的變化可能有效地被追蹤,且在相位旋轉共軛取消裏不用載波頻率偏移的回饋向發射端做評估來當要求。模擬結果顯示,在多變的時變通道裏被提議的方法有比相位旋轉共軛取消(PRCC)、常見共軛取消(CC)和兩階段IQ不平衡(Two-stage IQ imbalance)方法有更好的位元錯誤率之效能。
In the thesis, to efficient inter-carrier interference (ICI) cancellation in Space Time Block Code (STBC) and Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM), we use an adaptive receiver and combined to construct the whole system using two-path conjugate transmission. This receiver design is based on the phase rotated conjugate cancellation (PRCC) concept presented, and we can referred as an adaptive receiver of modified the PRCC scheme. Additionally, Channel estimation has the key effect to the system performance of MIMO-OFDM. We use a Kalman filter to trace the channel .The initial channel estimate is performed from sparse pilot signals. The cycle of data detection, decoding, and channel estimation is repeated until convergence. We also derive the optimal phase rotations using the criterion of maximizing the carrier-to-interference ratio, and then develop an adaptive normalized block least mean-squared algorithm to approach the optimal solutions. With such adaptive phase rotations in the receiver, the carrier frequency offset (CFO) variations due to the channel effect and the mismatch between oscillators at the transmitter and receiver can effectively be tracked without feeding back the CFO estimate to the transmitter as required in PRCC. Simulation results demonstrate that an adaptive receiver of modified the PRCC scheme approach has better bit error rate performance than the PRCC, the conventional CC and two-stage IQ imbalance schemes for various time-varying channels.
Chapter 1 Introduction 1
Chapter 2 Background 6
2.1 Multiple-Input Multiple-Out (MIMO) 6
2.2 Orthogonal Frequency Division Multiplexing (OFDM) 8
2.3 Spatial Diversity and Spatial Multiplexing 10
2.3.1 Introduce the STBC MIMO-OFDM systems 12
2.4 Major Problems of OFDM 14
2.4.1 Peak to Average Power Ratio(PAPR) 14
2.4.2 Inter-carrier Interference (ICI) 14
2.5 Channel Model 15
2.5.1 Multipath Propagation Effect 16
2.5.2 Slow Fading Channel and Fast Fading Channel 16
Chapter 3 ICI Cancellation Schemes for MIMO-OFDM systems 19
3.1 The CC and PRCC Scheme 19
3.1.1 Conjugate Cancellation Scheme 19
3.1.2 Phase Rotated Conjugate Cancellation Scheme 22
3.2 An adaptive receiver of modified the PRCC Scheme 26
3.2.1 System model 26
3.2.2 Choosing a Cost function 32
3.2.3 Normalized BLMS Algorithm [19]-[21] 33
Chapter 4 Frequency Offset Estimation and Kalman Channel Estimation 36
4.1 Frequency Offset Estimation 36
4.2 Kalman Channel Estimation 37
Chapter 5 Simulation Result 42
Chapter 6 Conclusion 65
Bibliography 66
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