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研究生： 吳志聰
Chihi-Tsung Wu
論文名稱： 利用多模式分碼多重擷取技術以降區域多點分配服務系統中細胞間的干擾
Using Multi-mode CDMA Scheme to Reduce Inter-cell Interference in Local Multipoint Distribution Service
指導教授： 蔡木金
Mu-King Tsay
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 電機工程學系
Department of Electrical Engineering
畢業學年度： 89
語文別： 中文
論文頁數： 75
中文關鍵詞： 多模式分碼多重擷取 、區域多點分配服務 、細胞間的干擾 、降雨衰減
外文關鍵詞： Multi-mode CDMA, LMDS, Inter-cell Interference, Rainfall Attenuation
相關次數： 點閱：4  下載：0 
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    • 供雙向的語音、影像及數據傳輸的寬頻整合服務。LMDS能夠滿足各類型的
    用戶分佈與應用，從住家到商業用途均能提供服務，因此更具有彈性及擴
    充性。台灣在去年(2000)三月十九日發放固網執照，即使有線寬頻傳輸應
    是其競爭的主軸，然而仍有業者藉助固定無線傳輸技術的應用，以提高其
    競爭力。由此可窺知LMDS的發展潛力。
    為了有效降低LMDS中細胞間干擾的問題，本論文提出一個新的細胞規
    劃，可以獲得較少的細胞間干擾，相關的分析討論詳見第二章。第三章，
    分析多模式分碼多重擷取的技術，以減少使用者受到的干擾。第四章則討
    論雨衰的影響。由分析可知多模式分碼多重擷取的技術只適用於降雨率小
    的情況；在大雨時可藉由縮小服務範圍及功率控制(預留所需的降雨衰落
    餘裕)來維持系統的正常運作。第五章是結論及討論。


    propagation techniques. Because it can provide wideband
    integrated services including two-way voice, video, and data
    transmission. The asymmetry between downstream and upstream is
    quite consistent with the normal data flow, particularly for
    residential applications. Of course the spectrum can also be
    used to provide symmetric traffic that would typically be
    required for business applications.
    In chapter 2, we propose a new cell planning, which suffers
    less inter-cell interference in comparison with the typical
    cell planning. Chapter 3 analyzes the technique of multi-mode
    CDMA scheme can reduce inter-cell interference effectively in
    clear air. Besides, high rainfall attenuation is a significant
    challenges associated with deploying systems at Ka band.
    Chapter 4 studies the multi-mode CDMA scheme is adequate in
    small rain rate condition. In large rain rate situation, we can
    maintain system performance by reducing cell size or by the
    process of power control. Finally, chapter 5 gives the
    conclusions.

    Contents Contents I List of Figures III List of Tables VII Chapter 1. Introduction 1 1-1. Local Multipoint Distribution Service (LMDS) 1 1-1-1. What Does the Acronym LMDS Mean? 1 1-1-2. Fixed Wireless Access Advantages 2 1-1-3. FCC Band Plan for LMDS 3 1-2. Motivation 5 Chapter 2. Background of LMDS 6 2-1. Characteristics of Propagation Channel 6 2-1-1. Propagation in Free Space 6 2-1-2. Fresnel-zone Ellipsoids 7 2-1-3. Propagation Loss 10 2-2. Dynamic Modulation Scheme 11 2-2-1. Dynamic Modulation Scheme 11 2-2-2. Key Parameter of Some Modulation Schemes 12 2-3. Layout of Cellular Configuration 13 2-3-1. System Deployment Trade-offs 13 2-3-2. Frequency Reuse 14 2-3-3. Alternating Polarizations 15 2-3-4. Cell Planning of LMDS 16 2-3-5. Inter-cell Interference of LMDS 17 2-3-6. New Cell Planning Using Hexagonal Cell Architecture 19 2-4. Link Budget Calculation 21 Chapter 3. Multiple Access Techniques in LMDS 23 3-1. TDMA-Based Networks 23 3-2. Application of CDMA 25 3-3. Multi-mode CDMA 29 3-4. System Performance of Multi-mode CDMA 36 3-4-1. Evaluating Results 38 3-4-2. Discussions 42 Chapter 4. Rain Effects in LMDS 44 4-1. Long-term Statistics of Rain Attenuation 45 4-2. Cross-polarization Discrimination (XPD) Statistics During Precipitation Conditions 49 4-3. System Performance Under Rain Condition 51 4-4. Transmission Availability in Rain Condition 68 4-5. Discussions 72 Chapter 5. Conclusions 73 References 75

    References
    [1] Gray Douglas A. "A Broadband Wireless Access System at 28
    GHz," IEEE, 1997.
    [2] Parsons J. D., The Mobile Radio Propagation Channel, John
    Wiley & Sons, 1998.
    [3] Lee Chang-Hoon, Boo-Young Chung, Su-Hee Lee, "Dynamic
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    [5] Sklar Bernard, Digital Communications, P T R Prentice Hall,
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    [6] Esmael H. Dinan and Bijan Jabbari, "Spreading Codes for
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    [8] Hikmet Sari, "A Multimode CDMA Scheme with Reduced
    Intercell Interference for LMDS Networks," IEEE, 2000.
    [9] He Rui-guang, “Development and Application of Fixed
    Wireless Transmission Technique,” Communication Magazine, June
    2000.
    [10] Propagation Data and Prediction Methods Required for The
    Design of Terrestrial Line-of-sight Systems, Rec. ITU-R P.530-8.
    [11] SHIEH Chiu-wen, “The Engineering of K Band Digital
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    [12] Papazian Peter B., George A. Hufford, Robert J. Achatz,
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    Interference in Fixed Wireless Cellular Systems,” IEEE, 1999.
    [14] Horng Jiann-Tsorng, “Prediction of Terrestrial Radio Link
    Transmission Availability and Rain Fade Margin in the 26 GHz
    Band,” TL TECHNICAL JOURNAL, Vol. 29, No. 4, August 1999.

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