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研究生： 劉育維
Yu-Wei Liu
論文名稱： 區域多點分散式服務多天線傳輸技術之效能分析
The Performance Analysis of Multiple Antennas Transmission Technique for Local Multipoint Distribution Service
指導教授： 陳永芳
Yung-Fang Chen
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 95
語文別： 中文
論文頁數： 62
中文關鍵詞： 區域多點分散式服務 、空間多工 、波束形成 、時空碼 、多輸入多輸出系統
外文關鍵詞： LMDS, Spatial Multiplexing, Beamforming, Space Time Code, MIMO System
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    • 區域多點分散式服務為點對多點的固定式無線寬頻存取服務，採用蜂巢式系統來提供高速的服務，如：寬頻、影像、音訊、數據等服務，免除以往使用纜線及其他有線方式佈置之費用，並適合用於『最後一哩』等無線接取技術。然而現今多天線傳輸技術可有效地提升系統的效能與傳輸速度，多天線傳輸技術主要可分成三大種類：波束形成、時空碼、空間多工，其中波束形成對抗干擾有顯著的成效；時空碼具有多樣性的能力，以對抗衰落的通道來提升效能，使位元錯誤率降低；空間多工可大幅提供資料傳輸速率。在本論文中，我們將使用各種多天線傳輸技術，並於蜂巢式系統架構下，以電腦模擬來分析各種多天線傳輸技術方法在此架構下的位元錯誤率效能與頻譜效益。

    LMDS (Local Multipoint Distribution Service) is the point to multi-point fixed wireless broadband access system and adopts cellular system to provide high-speed service such as: broadband access, video, message, data, etc. LMDS reduces the cost of traditional connection which uses coaxial cable or other wired method and is suitable for “Last-Mile “wireless access technique.
    Today multiple antennas transmission technique provides better system performance and higher data rate effectively. Multiple antennas transmission technique includes Beamforming, Space Time Code, and Spatial Multiplexing. Beamforming provides resistance to interference obviously, Space Time Code improves the error performance against multi-path fading channel, and Spatial Multiplexing provides higher data rate.
    In this thesis, we will make use of some multiple antennas transmission technique to analysis the bit error rate performance and spectrum efficiency of LMDS cellular system by computer simulation.

    第一章 緒論 1 1.1 前言 1 1.2 論文架構 2 第二章 LMDS系統模型與蜂巢式系統 3 2.1 LMDS系統 3 2.2 802.16D單載波模式之傳輸架構與訊號模型 6 2.2 路徑損失 10 2.3 雨衰預測模型 11 2.4 蜂巢式系統 16 第三章 MIMO系統模型與多天線傳輸技術 18 3.1 MIMO系統模型 18 3.2多輸入輸出系統使用時空區塊碼 19 3.2.1 使用2傳送天線之時空區塊碼系統 19 3.2.2 使用3傳送天線之時空區塊碼系統 21 3.2.3 使用4傳送天線之時空區塊碼系統 23 3.3多天線系統使用波束形成 27 3.3.1 傳統波束形成 27 3.3.3 調適性波束形成 29 3.3.3 廣義旁波瓣消除之波束形成 30 3.3.4 奇異值分解波束形成 31 3.4多輸入輸出系統使用空間多工 32 第四章 模擬結果 36 4.1 模擬環境參數 36 4.2模擬結果與分析 37 4.2.1 2天線系統通道模型Type0 37 4.2.2 2天線系統、通道模型Type0、干擾經過Rician fading、K=10 42 4.2.3 2天線系統、通道模型Type1 45 4.2.4 2天線系統、通道模型Type1、干擾經過Rician fading、K=10 47 4.2.5 3天線系統、通道type0 49 4.2.5 3天線系統通道模型Type1 52 4.2.6 4天線系統、 通道模型Type0 54 4.3 晴空與雨衰比較 58 第五章 結論 60 參考文獻 61

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