博碩士論文 92533001 詳細資訊




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姓名 許嘉修(Chia-Shiu Hsu)  查詢紙本館藏   畢業系所 通訊工程學系在職專班
論文名稱 利用細胞工程降低LMDS細胞間的干擾
(Inter Cell Interference Reduction of LMDS Systems by Cell Planning)
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摘要(中) LMDS在各項微波傳輸技術中,可以說是相當受到注目的。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,因此更具有擴充性及適應性。台灣在 西元2000 年開放固網服務,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。接著討論動態調變在 LMDS 環境的影響,本文提出一種新的動態調變方法使得系統可以得到更佳的資料傳輸速率。
摘要(英) In wireless cellular systems, co-channel interference is the limiting factor to system performance. Fix wireless systems such as Local Multipoint Distribution Systems (LMDS) is no exception to this rule. Because the LMDS transmission is usually higher-capacity, and the beam-width of subscribers’ antenna is narrow beam width, therefore co-channel interference in LDMS systems is more important. This thesis proposes a concept of subscribers’ antenna reorientation along with variable threshold dynamic modulation (VTDM) to reduce this interference. Using this scheme, we can get the better spectrum efficiency and reduce the interfering regions so that improve the system performance.
關鍵字(中) ★ 無線通訊 關鍵字(英) ★ LMDS
★ Wireless
論文目次 Contents
List of Figures VII
List of Tables IX
Chapter 1 1
Introduction 1
1-1. Local Multipoint Distribution Service (LMDS) 1
1-1-1. Introduction of LMDS 1
1-1-2. Advantages of Fixed Wireless Access 2
1-1-3. FCC Band Plan for LMDS 4
1-2. Motivation 5
1-2-1. Motivation 5
1-2-2. Why LMDS 6
Chapter 2 8
Background of LMDS 8
2-1. Feature of Propagation Channel 8
2-1-1. Propagation in Free Space 8
2-1-2. Propagation Loss 9
2-2. Inter-Cell interference calculation 10
2-2-1.The well-know radio formula 10
2-2-2. ITU-R Rain Attenuation Prediction Model 11
2-2-3. Cross-polarization Discrimination (XPD) 15
2-3. Layout of Cellular Configuration 16
2-3-1. System Deployment Trade-offs 16
2-3-2. Frequency Reuse 16
2-3-3. Alternating Polarizations 18
2-3-4. Cell Planning of LMDS 18
2-4. Link Budget Calculation 20
Chapter 3 21
Cell pattern planning 21
3-1.Conventional architecture 21
3-1-1. Co-channel interference 22
3-2. Twisted pattern 26
3-3. Subscriber’s antenna reorientation 30
Chapter 4 34
Simulation and Analysis 34
4-1.Coverage ratio 34
4-2. Variable Threshold Dynamic Modulation in LMDS 35
4-2-1. Dynamic Modulation Scheme 36
4-2-2. The Statistical Behavior of Transmitted Signals 37
4-3. Higher order modulation scheme 40
4-4. Effects of beam-width 43
4-5. Effects of XPD 47
4-6. Effects of rain rate 53
4-7. Discussions 57
Chapter 5 59
Conclusions 59
References 61
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] C.W. Shieh “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] C.Y. 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] M.K. Tsay and F.T. Wang, ”A Twisted Sector Cellular Pattern in Local Multipoint Distribution System,” Journal of the Chinese Institute of Electrical Engineering , Vol.10, No3. 2003.
[10] C.H. Lee, B.Y. Chung and S.H. Lee, "Dynamic Modulation Scheme in Consideration of Cell Interference for LMDS," ICCT’98, October 22-24, 1998.
[11] L.C. 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] C.C. Chang, “The Analysis of ISI on LMDS using O-CDMA with Code Arrangement.” , 2004
[17] Y.J. Jian, “Study of Channel Utilization Consideration of Rain Attenuation for LMDS”. , 2001
[18] J.C. Chiu, “Inter Cell Interference Reduction of LMDS for the downlink direction”. , 2005
[19] M.Y. 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 2006-7-20
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