LMDS系統受降雨衰減影響下通道使用效能之研究

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姓名

簡裕潔(Yu-chieh Chien ) 查詢紙本館藏

畢業系所

電機工程研究所

論文名稱

LMDS系統受降雨衰減影響下通道使用效能之研究
(Study of Channel Utilization in Consideration of Rain Attenuation for LMDS)

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摘要(中)

隨著電信服務需求的持續增加，愈來愈多的無線通訊系統設計者考慮使用Ka波段，因為它擁有寬頻與高傳輸率等特性，也因此地面多點分配系統（Local Multipoint Distribution System ,LMDS）在陸地微波站的應用日趨重要。然而降雨衰減是造成此波段通訊系統效能退化的最主要成因，因為其信號會受豪雨吸收與散射而衰減，而且位處亞熱帶之台灣地區的年平均降雨量很大，故有必要對此波段在LMDS中受雨衰影響下的電波特性作分析研究。
本論文乃考慮在典型的細胞規劃環境下，使用美國Hughes Network Systems公司所提供的LMDS系統規格，並且引用Crane全球降雨衰減修正模型以及國際電信聯合會提供之最新降雨衰減模型 (ITU-R 530-8)，來預估此系統在台灣地區其通道受降雨衰減影響下的累積分佈特性。另外，再藉由動態頻寬配置的基本概念，將動態調變技術 (Dynamic Modulation Scheme) 應用在此系統中以求得最大的頻寬效益 (Bandwidth Efficiency)。
本論文將提供完整的分析通道降雨衰減程序之運作流程，並針對通道使用效能有詳盡的討論，並進行電腦模擬作效能的評估。

摘要(英)

Regulatory agencies from several nations are currently licensing or allocating significant blocks of spectrums near 28 GHz and 40GHz for use by terrestrial wireless broadband access systems such as LMDS (Local Multipoint Distribution Systems) which supported include bandwidth intensive video distribution, data services such as high-speed internet and several emerging interactive multimedia communications.
However, attenuation due to rainfall can severely degrade the radio wave propagation at frequencies above 10 GHz. Since the subtropical climate in Taiwan is characterized as high intensity rainfall, the knowledge of the rain attenuation at the frequency of operation is extremely required for the design of a reliable communication system at a particular location.
The thesis, based on a typical LMDS architecture and Hughes Network Systems’ specification for the system, uses modified Crane model as well as ITU-R 530-8 model to predict the channel characteristics in terms of cumulative distribution function and further studies the channel utilization of the system by making use of the DMS (Dynamic modulation Scheme) technique to achieve the best bandwidth efficiency.

關鍵字(中)

★ 動態調變配置
★ 細胞規劃
★ 通道容量
★ 雨衰預測模型
★ 點對多點區域分布系統

關鍵字(英)

★ Cell Planning
★ Channel Capacity
★ Dynamic Modulation Allocation
★ LMDS
★ Rain Attenuation Prediction Model

論文目次

Contents
Abstract.......................................................i
Contents.....................................................iii
List of Figures................................................v
List of Tables................................................ix
Chapter 1 Introduction.........................................1
1.1Motivation and Objective..............................1
1.2Structure of the Thesis...............................4
Chapter 2 LMDS Networks........................................5
2.1FCC Band Plan.........................................5
2.2 Typical LMDS Cellular Architecture........................8
2.2.1 Configuration............................................8
2.2.2 Cell Planning............................................9
2.2.3 Inter-Cellular Interference.............................12
2.3 Link Budget Calculation............................13
2.4 DBA (Dynamic Bandwidth Allocation).................16
Chapter 3 Prediction of Rain Attenuation......................21
3.1Modern Development of Rain Attenuation...............21
3.2Rain Attenuation Prediction Models...................24
3.2.1 Crane Global Rain Attenuation Model.....................25
3.2.2 ITU-R 530-8 Rain Attenuation Model......................29
3.3Rain Attenuation Prediction in Taiwan................32
Chapter 4 Channel Utilization for LMDS........................40
4.1Motivation and objective.............................40
4.2Channel Capacity in Rain Fading......................41
4.3Estimation of Mean and Standard Deviation of Rain Attenuation Distribution......................................45
4.4Efficient Channel Utilization........................48
4.5Bit Error Rate Degradation...........................57
Chapter 5 Conclusions.........................................85
Appendix Abbreviations and Acronyms............................I
References....................................................IV

參考文獻

[1] FCC 2nd Report & Order Issued March 13,1997.
[2] http:// www.hns.com
[3] Chang-Hoon Lee, Boo-Young Chung, Su-Hee Lee,” Dynamic Modulation Scheme In Consideration of Cell Interference For LMDS,” ICCT’98, Oct 22-24,1998.
[4] U.S.A, “Typical technical and Operational characteristics and potential interference considerations of high density point-to-multipoint systems in the frequency band 25-32 GHz”, ITU-R Doc.9B/37-E, Feb. 1998
[5] Gi-Sun Kim, “Modem technology for digital LMDS service,” Korea Electrics Technology Trans., vol. 25, Apr. 1998.
[6] Atlas, D. and Ulbrich, C.W., Path- and area- integrated rainfall measurement by microwave attenuation in the 1-3cm band,” J. Appl. Meteor, vol.16, pp.1322-1331, 1997.
[7] R. K. Crane, Electromagnetic Wave propagation Through Rain. New York: Wiley, 1996.
[8] ITU-R Recommendation 530-8, “ Propagation data and prediction methods required for the design of terrestrial line-of-sight systems”, P series (2000).
[9] Tri T. Ha, Digital Satellite Communications, McGraw-Hill International Editions, 1990
[10] Recommendation ITU-R PN.837, “Characteristics of precipitation for propagation modeling”, 1994, International Telecommunication Union, Geneva, Switzerland.
[11] Recommendation ITU-R P.838, “Specific attenuation model for rain for use in prediction methods”, 1994, International Telecommunication Union, Geneva, Switzerland.
[12] Moidrag Flip and Evric Vilar, “Optimum Utilization of the Channel Capacity of a Satellite Link in the Presence of Amplitudes Scintillations and Rain Attenuation,” IEEE Trans. On Commune. Vol. 38, No. 11, pp. 1958-1965, Nov. 1990.
[13] M. Schwartz, “ Information Transmission, Modulation, and Noise,” New York: McGraw-Hill, 1981.
[14] Kaivan Karimi and Henry Helmken, “ Astudy of Satellite Channel Utilization in the Presence of Rain Attenuation in Florida,” to Appear in IEEE in Trans. on Commune. 1994.
[15] Simon Haykin, “ Communication System 3/e,” Wiley, New York, 1994.
[16] V. K. Bhargava, D. Haccoun, R. Matayas, and P.P. Nuspl, Digital Communications By Satellite: Modulation, Multiple Access and Coding, Wiley, New York, 1981.
[17] Tri. T. Ha, “Digital Satellite Communications”, Second Edition, 1990,PP. 1970-177.
[18] Louis J. Ippolito Jr., ”Radio Wave Propagation in Satekkite Communications”, New York, 1986, pp. 93-121.
[19] Pruppacher, H. R., and Pitter, R.L., “A Semi-Empirical Determination of the Spcace of Cloud and Rain Drops”, “ Journal of the Atmospheric Sciences, Vol. 28, pp. 86-94, January 1971.

指導教授

蔡木金(Mu-King Tsay)

審核日期

2001-6-1

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