改善下鏈方向CDMA架構之LMDS網路的功率控制之研究

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姓名

李栢松(Bo-Song Lee) 查詢紙本館藏

畢業系所

通訊工程學系在職專班

論文名稱

改善下鏈方向CDMA架構之LMDS網路的功率控制之研究
(Study of Modified Power Control for Downlink CDMA-Based LMDS Networks)

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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。第四章，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 4 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. Finally, chapter 5 gives the conclusions.

關鍵字(中)

★ 微波傳輸技術

關鍵字(英)

★ LMDS

論文目次

Contents 1
List of Figures 2
List of Tables 4
Chapter 1 5
Introduction 5
1-1. Local Multipoint Distribution Service (LMDS) 5
1-1-1. Introduction of LMDS 5
1-1-2. Advantages of Fixed Wireless Access 6
1-1-3. FCC Band Plan for LMDS 8
1-2. Motivation 9
1-2-1. Motivation 9
1-2-2. Why LMDS 10
Chapter 2 12
Background of LMDS 12
2-1. Feature of Propagation Channel 12
2-1-1. Propagation in Free Space 12
2-1-2. Propagation Loss 13
2-2. Layout of Cellular Configuration 14
2-2-1. System Deployment Trade-offs 14
2-2-2. Frequency Reuse 14
2-2-3. Alternating Polarizations 16
2-2-4. Cell Planning 16
2-2-5. Cell Planning Using Hexagonal Cell Architecture 20
2-3. Link Budget Calculation 22
Chapter 3 24
Multiple Access Techniques in LMDS 24
3-1. TDMA-Based Networks 24
3-2. CDMA-Based Networks 27
Chapter 4 31
Power Control 31
4-1. Typical Power Control 31
4-2. Proposed Power Control 33
4-3. Effects of rain rate 40
4-4. Discussions 52
Chapter 5 53
Conclusions 53
References 54

參考文獻

[1] Gray Douglas A. "A Broadband Wireless Access System at 28 GHz," IEEE, 1997.
[2] S. Farahvash and M. Kavehrad, “Co-channel Interference Assessment for Line-of-Sight and Nearly Line-of-Sight Millimeter-Waves Cellular LMDS Architecture,” International Journal of Wireless Information Networks (Kluwer Academic Publishers), Vol. 7, No. 4, 2000.
[3] Propagation Data and Prediction Methods Required for The Design of Terrestrial Line-of-sight Systems, Rec. ITU-R P.530-8.
[4] Shieh Chiu-wen “The Engineering of K Band Digital Microwave Systems,” Telecommunication Technique Journal, Vol. 1, No. 2, May 1997.
[5] Papazian Peter B., George A. Hufford, Robert J. Achatz and Randy Hoffman, “Study of the Local Multipoint Distribution Service Radio Channel,” IEEE Transactions on Broadcasting, Vol. 43, No. 2, June 1997.
[6] Chih-Yuan Chu and K.S. Chen, "Effects of Rain Fading on the Efficiency of the Ka-band LMDS System in the Taiwan Area," IEEE Transactions on vehicular technology, January 2005.
[7] Hikmet sari ”Some Design Issues in Local Multipoint Distribution System,” IEEE, 1998.
[8] Vincentzio Roman “Frequency Reuse and System Deployment in Local Multipoint Distribution Service,” IEEE Personal Communications, December 1999.
[9] Mu-King Tsay and Fu-Tung Wang, ”A Twisted Sector Cellular Pattern in Local Multipoint Distribution System,” Journal of the Chinese Institute of Electrical Engineering , Vol.10, No3. 2003.
[10] Lee Chang-Hoon, Boo-Young Chung and Su-Hee Lee, "Dynamic Modulation Scheme in Consideration of Cell Interference for LMDS," ICCT’98, October 22-24, 1998.
[11] Li-Chun Wang, Kapil Chawla,and Larry J. Greenstein,
”Performance Studies of Narrow-Beam Trisector Cellular Systems,” International Journal of Wireless Information Networks, Vol.5, No. 2, 1998,
[12] Byoung-Jo Choi; Hanzo, L.; “RAKE receiver detection of adaptive
modulation aided CDMA over frequency selective channels”;
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th , Volume: 3 , 2001
[13] Ziemer R. E., W. H. Tranter, Principles of Communications, Houghton Mifflin Company, 1995.
[14] Sklar Bernard, Digital Communications, P T R Prentice Hall, 1988.
[15] W.C.Y Lee, Mobile Communication Engineering. McGraw-Hill, 1982
[16] Chao-Chang Chang, “The Analysis of ISI on LMDS using O-CDMA with Code Arrangement.” , 2004
[17] Yu-Jie Jian, “Study of Channel Utilization Consideration of Rain Attenuation for LMDS”. , 2001
[18] Jun-Ching Chiu, “Inter Cell Interference Reduction of LMDS for the downlink direction”. , 2005
[19] Ming-Yi Xie, “The Performance Analysis of Local Multipoint Distribution Service (LMDS) using CDMA with Power Control”. , 2003
[20] M.K. Tsay and Z.S. Lee, “Improve the performance of CDMA-based LMDS by power control Along with Dynamic Modulation”, IJEE accepted, 2006

指導教授

蔡木金(Mu-King Tsay)

審核日期

2006-7-19

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