臺灣博碩士論文加值系統

無線通訊所需面對的難題，包括多重路徑衰減、有限頻寬限制，及共頻道干擾等。除此之外，還要滿足日益增加的使用者需求。因此智慧型天線系統的開發利用已成為必然趨勢。其擁有減緩多重路徑衰減、抑制同頻干擾、提昇傳輸效能及增加系統容量等優點。智慧型天線系統之著眼點在於尋求一個簡單可行之適應性陣列技術來進行快速波束切換以達成空間分割多重存取之目的。
本論文之研究在於減少多路徑傳輸環境下所可能造成的同調與非同調干擾問題，分析比較各種適應性陣列技術的處理效能。最後基於系統計算量與複雜度的考量，我們特別針對線性限制最小化法則(LCMV)提出一個簡化的型式：線性限制法則(LC)，以期能夠更適用於智慧型天線系統。

Facing the problems in wireless communicaiton, including multipath-fading, limited bandwidth, and co-annelinterferences. Besides that, we also have to satisfy the requirement of the incresing number of subscribers. Thus, it becomes a necessary trend to design a smart antenna system. It can mitigate multipath fading, eliminate co-channel interferences, improve transmission efficiency and increase system capacity. The key point of it is to find a proper adaptive algorithm which can be used to change its pattern quickly and to the aim of SDMA.
In this thesis, thinking of the coherent and noncoherent interferences arising from multipath, we analysis and comparion of some algorithms on reducing the above problems. At last, taking account of complex and computing load of a system, a simplified type for LCMV, called linearly constrained criterion(LC) is presented. We really hope LC can be applied to smart antenna system more suitable.

中文摘要 i
英文摘要 ii
誌謝 iii
圖目錄 v
表目錄 vi
縮寫及符號對照表 vii
第一章 緒言 1
1.1 研究動機 1
1.2 智慧型天線系統 3
1.3 研究方法與各章摘要 6
第二章 多路徑傳輸環境 8
2.1 多重路徑衰減 8
2.2 無線行動通道模型 10
第三章 適應性陣列技術對處理多重路徑干擾之研究 14
3.1 處理非同調干擾的適應性技術 14
3.1.1 線性限制最小變異法 15
3.1.2 廣泛式旁瓣消去法 16
3.1.3 特徵值消去法 18
3.2 處理同調式干擾的適應性技術 21
3.2.1 空間平滑技術 21
3.2.2 二次式條件限制法 25
3.3 電腦模擬與分析 27
3.3.1 以適應性陣列技術減少多重路徑干擾之成效 27
3.3.2 SINR定義 30
3.3.3 模擬分析與比較 32
第四章 LCMV的簡化型式：LC 47
4.1 線性限制法 48
4.2 LCMV與LC的綜合比較 51
4.3 電腦模擬與分析 53
第五章 結論 58
參考文獻 60
作者簡介 63

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