臺灣博碩士論文加值系統

本文主要針對MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing)系統之信號檢測法進行研究。在多天線正交分頻多工系統中，天線之相關性會影響系統之效能，這是由於在關聯性通道環境下，以不同天線傳送的信號在同時間會受到相似的衰減效應，使得空間分集效益無法有效的提升，因此，我們利用信號檢測方法來改善系統之效能。首先我們考慮幾種檢測方法: Alamouti full matrix、Alamouti diagonal matrix、LS-ZF (Least Square-Zero Forcing)、SIC (Successive Interference Cancellation)檢測法，來分析MIMO STBC-OFDM (Space Time Block Coding-Orthogonal Frequency Division Multiplexing)系統在頻率選擇性衰減通道下之效能，證明SIC檢測法在考慮關聯性及非關聯性的通道下能夠達到很好的效能。

The object of this thesis is to investigate signal detection of MIMO-OFDM system. In MIMO-OFDM system, the antenna correlation affects the performance of system. Due to the fact that signal at different antennas tend to fade at the same time, the spatial diversity benefit could not be increased effectively. Therefore, we exploit detection methods to improve system performance. First, we considers several detection methods to evaluate the performance of MIMO STBC-OFDM system by Alamouti、LS-ZF (Least Square-Zero Forcing)、SIC (Successive Interference Cancellation) detection methods. It can be seen that STBC-OFDM system with SIC detection method could have excellent performance in correlated and uncorrelated fading channels.

誌謝.........................................................................................................................................i
中文摘要................................................................................................................................ii
英文摘要...............................................................................................................................iii
目次.......................................................................................................................................iv
圖目次....................................................................................................................................v
表目次...................................................................................................................................vi

第一章 前言..........................................................................................................................1
第二章 多重輸入輸出正交分頻多工系統介紹..................................................................3
2.1 單一輸入輸出正交分頻多工系統.........................................................................3
2.2 多重輸入多輸出架構.............................................................................................6
2.2.1 空時區塊碼之介紹......................................................................................7
2.3 多天線架構與正交分頻多工系統之結合...........................................................10
2.3.1 空時區塊碼之正交分頻多工系統介紹....................................................10
第三章 多重輸入輸出無線傳輸通道模型........................................................................15
3.1 Vehicular A通道模型之介紹.............................................................................15
3.1.1 基地台之空間參數....................................................................................16
3.1.2 行動台之空間參數....................................................................................17
3.1.3 天線相關性................................................................................................18
3.1.4 Vehicular A通道鏈結關聯性.....................................................................22
3.2 Vehicular A通道模型建構之模擬結果................................................................23
第四章 傳統MIMO-OFDM檢測法在考慮天線相關性之多天線正交分頻多工系統之性能表現..............................................................................................................33
4.1 Alamouti檢測法.................................................................................................34
4.1.1 Alamouti full-matrix檢測法.....................................................................34
4.1.2 Alamouti diagonal-matrix檢測法.............................................................35
4.2 LS-ZF檢測法......................................................................................................36
4.3 傳統檢測法之性能評估.......................................................................................37
第五章 多天線正交分頻多工系統之SIC檢測法.............................................................51
5.1 V-BLAST系統之介紹........................................................................................51
5.1.1 V-BLAST系統檢測法................................................................................52
5.2 正交分頻多工系統之SIC檢測法......................................................................54
5.2.1 空時區塊碼之正交分頻多工系統之SIC檢測法.................................... 58
5.3 SIC檢測法對天線相關性之多天線正交分頻多工系統之抵抗能力..............60
5.3.1 SIC檢測法對不同衰減率之多天線正交分頻多工系統之效能..............65
5.3.2 SIC檢測法對不同調變機制之多天線正交分頻多工系統之效能..........69
第六章 結論........................................................................................................................73
參考文獻.....................................................................................................................74

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