博碩士論文 945303018 詳細資訊




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姓名 陳韋廷(Wei-Ting Chen)  查詢紙本館藏   畢業系所 通訊工程學系在職專班
論文名稱 使用於 SFBC MIMO-OFDM 系統之半盲目通道追蹤方法
(SFBC MIMO OFDM Channel Estimation with a Semiblind Method)
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摘要(中) 在本論文中將空頻區塊碼(Space Frequency Block Code )與多輸入多輸出之正交分頻多工(Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing, MIMO-OFDM)兩種技術結合作為系統架構。對多輸入多輸出系統的接收端而言,通道估測對系統效能有關鍵的影響。在本論文中,我們採用半盲目的方式來進行通道的追蹤。當系統在追蹤通道時為依據當時通道的特性來選擇使用決策迴授機制或是改良式固定模數演算法(Modified Constant Modulus Algorithm)來進行估測。由分析結果得知,如此切換的方式加上空頻區塊碼本生的特性。比傳統僅使用決策迴授法或改良式固定模數演算法的效能更佳。
摘要(英) In the thesis, SFBC (Space Frequency Block Code) and MIMO-OFDM ( Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing ) are combined to construct the whole system. Channel estimation has the key effect to the system performance as far as the receiver of MIMO-OFDM is concerned. We also use a semi-bland method to trace the channel. When the system is tracing the channel, decision feedback or Modified Constant Modulus Algorithm(MCMA) can be chosen according to the property of the channel. From simulation, results, the switching method and the properties of the new SFBC method produces better bit error rate performance than traditional decision feedback or MCMA.
關鍵字(中) ★ 通道估測 關鍵字(英) ★ channel estimation
★ SFBC
論文目次 第一章 序論 3
1.1 前言 3
1.2大綱介紹 2
第二章 SFBC MIMO-OFDM系統介紹 3
2.1 SFBC編碼方式介紹 3
2.2 SFBC MIMO-OFDM系統介紹 5
2.3 自迴歸模型與傑克斯模型的簡介 10
第三章 SFBC MIMO-OFDM之通道追蹤 15
3.1 MIMO-OFDM通道估測法 16
3.2 決策迴授機制等化器 19
3.3 MCMA演算法 25
3.4 Normalized MCMA 與相位回復 36
3.5 半盲目通道追蹤與決策迴授機制之切換法則 39
第四章 模擬與分析 46
4.1 系統及通道模型參數設定 46
4.2 決策迴授機制平滑化參數對系統影響之模擬 47
4.3 NMCMA中不同步階大小對系統影響之模擬 49
4.4 通道追蹤演算法效能與位元錯誤率之模擬與分析 50
4.4.1 不同 值切換對系統影響之模擬 51
4.4.2 不同 值切換對系統影響之模擬 53
4.4.3 滑動視窗值對於影響系統切換之模擬 55
4.5 通道追蹤演算法效能與位元錯誤率之模擬與分析 57
第五章 結論與未來展望 62
參考文獻 63
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指導教授 張大中(Dah-Chung Chang) 審核日期 2009-11-13
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