博碩士論文 90523016 詳細資訊


姓名 謝明誼(Ming-Yi Shie)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 區域多點分配服務使用分碼多重擷取技術和功率控制系統中細胞間效能分析
(The Performance Analysis of Local Multipoint Distribution Service (LMDS) using CDMA with Power Control)
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摘要(中) 在各項微波傳輸技術中,LMDS可以說是最受到注目的,因為它可以提供雙向的語音、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。台灣在大前年(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,分析分碼多重擷取加上功率控制的技術,以減少使用者受到的干擾。第四章則討論動態調變在LMDS環境的影響。我們可以使用較高階的調變器在細胞內某些較好通道品質的地方來增加系統可負載的資料速率。第五章是結論及討論。
摘要(英) LMDS is the most obtrusive among mini-meter wave 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 use cells planning, which suffers less inter-cell interference in comparison with the typical cell planning. Chapter 3 analyzes the technique of CDMA with power control 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 Dynamic modulation scheme effect in LMDS, we can increase the system data rate by using higher modulation level of data modulation in certain parts had better channel quality of a sector. Finally, chapter 5 gives the conclusions.
關鍵字(中) ★ 區域多點分配服務
★ 分碼多重擷取技術
★ 功率控制
關鍵字(英) ★ LMDS
★ CDMA
★ Power Control
論文目次 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. Introduction to the 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. Propagation Loss 7
2-2. Inter-Cell Interference Calculation 8
2-2-1. The Well-know Radio Formula 8
2-2-2. ITU-R Rain Attenuation Prediction Model 9
2-2-3. Cross-Polarization Discrimination (XPD) Statistics During Precipitation Conditions 13
2-3. Layout of Cellular Configuration 15
2-3-1. System Deployment Trade-offs 15
2-3-2. Frequency Reuse 16
2-3-3. Alternating Polarizations 17
2-3-4. Cell Planning of LMDS 18
2-3-5. Inter-cell Interference of LMDS 19
2-3-6. Cell Planning Using Hexagonal Cell Architecture 21
2-4. Link Budget Calculation 24
Chapter 3. Multiple Access Techniques in LMDS 26
3-1. TDMA-Based Networks 26
3-2. Application of CDMA 28
3-3. CDMA with Proposed Power Control 32
3-4. System Performance of CDMA with Proposed Power Control
37
3-4-1. Simulating Results 39
3-4-2. Summarization 43
Chapter 4. Dynamic Modulation in LMDS 45
4-1. Dynamic Modulation Scheme 46
4-1-1. Dynamic Modulation Scheme 46
4-1-2. Key Parameters of Some Modulation Schemes 49
4-2. The Statistics Behavior of Transmitted Signals 51
4-3. System Performance Under Proposed schemes 53
4-4. Discussions 77
Chapter 5. Conclusions 79
References 81
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指導教授 蔡木金(Mu-King Tsay) 審核日期 2003-6-17
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