半盲目通道估測於多輸入多輸出單載波頻率等化器系統

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姓名

魏創翌(Chuang-Yi Wei) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

半盲目通道估測於多輸入多輸出單載波頻率等化器系統
(Semi-blind Channel Estimation for MIMO SC-FDE Systems)

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摘要(中)

於無線通訊系統中，由於通道所造成之衰減會導致訊號失真，因此處理通道之效應已廣泛的被討論。本篇論文以常數模演算法為基礎之空時區塊編碼(Space-Time Block Code)多輸入多輸出(Multiple-Input Multiple-Output, MIMO)單載波頻率等化系統(Single-Carrier Frequency-Domain Equalization, SC-FDE)進行通道估測，於接收端使用一切換準則，此切換準則會根據目前通道特性於盲目(Blind)通道估測法與決策迴授(Decision Feedback)估測法之間作切換進行通道估測，進而增加系統效能。根據模擬結果顯示，在空時區區塊編碼多輸入多輸出單載波頻率等化系統下使用盲目通道估測法與決策迴授法之間作自動切換的方式會得到較僅使用盲目通道估測法或決策迴授法更佳的性能。

摘要(英)

The time-varying channel environment can lead to signal distortion in a wireless system, therefore, how to deal with the effects of a mobile channel has been widely studied. This thesis studies a multiple-input multiple-output (MIMO) constant modulus algorithm based semi-blind single-carrier frequency-domain equalizer (SC-FDE) system which adopts space-time block code (STBC) for MIMO channel equalization. At the receiver, an automatic switching scheme is applied based on the present channel status to switch the channel tracking algorithm between blind channel estimation and decision feedback estimation method in order to improve the system performance. From simulation results, we show that the switching method for channel estimation in the MIMO STBC SC-FDE system can gain better performance than that using only blind channel estimation method or decision feedback method.

關鍵字(中)

★ 多輸入多輸出
★ 通道追蹤

關鍵字(英)

★ channel tracking
★ MIMO

論文目次

第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
第2 章多輸入多輸出單載波(MIMO Single-Carrier) 系統介紹. . . . . . . . . . . . . . 5
2.1 STBC MIMO SC-FDE 傳收系統介紹. . . . . . . . . . . . . . . . . . . . . . 5
第3 章利用常數模演算法(CMA) 進行通道估測於STBC MIMO SC-FDE 系統. . . .9
3.1 相位估測法. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 CMA 通道估測法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 MCMA 通道估測法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.4 決策迴授通道估測法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
第4 章A 2x2 STBC MIMO Channel Estimation with Proposed Method . . . . . . . . 26
4.1 利用已知序文(Preamble) 估測通道. . . . . . . . . . . . . . . . . . . . . . . 27
4.2 MCMA/Decision Feedback 切換運作. . . . . . . . . . . . . . . . . . . . . . 28
4.2.1 傳統預設區間切換機制. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.2.2 適應性切換機制. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
第5 章模擬結果. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.1 系統及通道模型參數設定. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2 MCMA 與決策迴授通道估測之切換機制模擬與分析. . . . . . . . 35
5.2.1 不同步階大小對系統影響之模擬與分析. . . . . . . . . . . . . . . 36
5.2.2 不同切換門檻值對系統影響之模擬與分析. . . . . . . . . . . . . 38
5.2.3 不同視窗大小對系統影響之模擬與分析. . . . . . . . . . . . . . . 40
5.2.4 不同β 值切換對系統影響之模擬與分析. . . . . . . . . . . . . . . 49
5.3 通道估測演算法效能與位元錯誤率之模擬與分析. . . . . . . . . . . 53
第6 章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

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指導教授

張大中(Dah-Chung Chang)

審核日期

2010-8-17

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