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研究生:葉益良
研究生(外文):YI LIANG YE
論文名稱:高斯與昇餘弦波束成形技術在CDMA系統之應用
論文名稱(外文):Application of Gaussian and Raised-Cosine Beam formers in CDMA Wireless Systems
指導教授:李金椿
指導教授(外文):Chin-Chun Lee
學位類別:碩士
校院名稱:大葉大學
系所名稱:電信工程學系碩士班
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:2007
畢業學年度:95
語文別:中文
論文頁數:57
中文關鍵詞:CDMA相位加權法高斯加權法昇餘弦加權法細胞內部干擾降低因子細胞間干擾增加因子。
外文關鍵詞:CDMA、phase weight、Raised-Cosine window weight、Gaussian window weight、intra-cellular reduction factor、inter-cellular in
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本文在於研究高斯(Gaussian)與昇餘弦(Raised-Cosine)波束成形技術在CDMA系統上之應用,探討其兩種輻射場型對於CDMA系統效能改善的能力,並與基本的相位加權法做比較。效能改善能力採用位元能量對干擾功率密度比(Eb/I0)的改善增益作為評估指標。我們發現當陣列天線元子數增加時,細胞內干擾降低因子會減少,而細胞間的干擾增加因子,相位加權法會隨著天線元子數增加而增加,但高斯與昇餘弦兩種加權法則維持不變。在CDMA整體效能提昇上,高斯與昇餘弦兩種加權法會有較好的表現,雖然高斯加權法會隨著天線元子數增加而提昇效能但效能還是沒有比已飽和的昇餘弦加權法來的好,所以昇餘弦加權法在效能提昇上會有更好的表現。
This thesis utilizes Gaussian and Raised-Cosine window to shape the beam pattern of an antenna array CDMA communication system. We explore the performance improvement by the two beam patterns. Moreover, the performance, in terms of bit energy to interference power ratio (Eb/I0), is comprehensively compared with the conventional phase weighting scheme.
We find that the intra-cellular reduction factor decreases as the number of antenna elements increases. The inter-cellular interference increase factor increases in accordance with array size in phase weighting scheme, where as it is independent of array size in both the Gaussian and Raised-Cosine weighting schemes. As a whole, we find that both the Gaussian and Raise-Cosine weighting schemes outperform the phase weighting scheme and the Raise-Cosine weighting scheme is slightly better than the Gaussian weighting scheme.
封面內頁
簽名頁
授權書.........................iii
中文摘要 ........................iv
英文摘要 ........................v
誌謝..........................vi
目錄..........................vii
圖目錄.........................x

第一章 緒論...................... 1
1.1簡介 .................... 1
1.2研究動機...................2
1.3文獻探討...................3
1.4內容大鋼...................4
第二章 展頻原理及CDMA系統..............5
2.1 展頻概念與技術 ...............5
2.1.1展頻基本概念 ..............6
2.1.2展頻原理 ................7
2.1.3虛擬雜訊序列(PN Sequence) ........7
2.1.4展頻因子................9
2.2遠近效應(Near-Far Effect) ...........10
2.3功率控制(Power Control) ...........11
2.4劃碼多重接取優點..............12
2.5 CDMA系統效能 ..............13
第三章 陣列天線原理與權值設計.............15
3.1天線系統的種類...............15
3.2陣列天線系統基本模組與原理 .........19
3.2.1一維均勻線性陣列............19
3.2.2一維均勻線性陣列的信號處理.......21
3.2.3操縱向量(Steering Vector).........23
3.2.3.1一維均勻線性陣列的操縱向量....23
3.2.3.2圓形陣列的操縱向量........24
3.2.3.3平面陣列的操縱向量........25
3.3波束成型技術................26
3.3.1空間濾波器(Spaial Filter) .........26
3.3.2波束成型網路(Beamforming Network)....29
3.4波束成型的權值設計 .............31
3.4.1離散傅立葉轉換與反離散傅立葉轉換....32
3.4.2頻率取樣方式(Frequency-Sampling Method) .33
3.4.3窗口法(Windowing Method)........34
第四章 高斯與昇餘弦之輻射場型提升CDMA系統效能 ...36
4.1線性陣列天線場型 ..............36
4.1.1相位加權法...............37
4.1.2高斯(Gaussian)加權法 ..........39
4.1.3昇餘弦(Raised-Cosine)加權法 .......40
4.2電波涵蓋範圍 ................43
4.3提升CDMA系統效能之分析..........44
4.3.1細胞內部干擾降低因子..........44
4.3.2細胞間干擾增加因子...........47
4.3.3 Eb/I0效能的改善.............49
第五章 結論...................... 53
參考文獻........................ 54
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