| 研究生: |
詹大山 Ta-Shan Chan |
|---|---|
| 論文名稱: |
LMDS通道在雨衰影響下的分析 Study of LMDS Channel Utilization by Rain Attenuation |
| 指導教授: |
蔡木金
Tsay Mu-King |
| 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: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 78 |
| 中文關鍵詞: | 地面多點分配系統 、雨衰 |
| 外文關鍵詞: | Rain Attenuation, LMDS |
| 相關次數: | 點閱:12 下載:0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
隨著無線通訊的日益普及,以及各類型網路加值服務龐大的資料量與即時傳輸已使得低頻率的無線通訊頻段過於擁擠而不敷使用,而Ka(26~40GHz)波段高頻寬特性正符合現今無線通訊的需要;地面多點分配系統(Local Multipoint Distribution System, LMDS)亦為使用Ka波段的通訊系統。
由於降雨衰減是造成使用此波段的LMDS性能低落的主因,故本論文乃考慮在典型的細胞規劃下,使用美商New Bridge LMDS系統規格,並且由實驗所得的雨衰資料而修改的Crane雨衰預測模型,來預估此系統在台灣地區其通道受降雨衰減影響下的特性。另外再藉由動態調變架構(Dynamic Modulation Scheme)應用在此系統中以求得最大的頻寬效益
There are more and more communication systems that operate at 28~40 GHz because of high data rate and broadband service, such as LMDS (Local Multipoint Distribution System). However, attenuation due to rainfall severely degrades the radio wave propagation at frequencies about 28GHz.
The thesis, based on a typical LMDS architecture and LMDS specification of New Bridge System, uses modified Crane model by our measurements to predict the channel characteristic in terms of cumulative distribution function and further studies the channel utilization while the system by making use of the Dynamic Modulation Scheme technique to achieve the best bandwidth efficienc
[1] Chang-Hoon Lee, Boo-Young Chung, and Su-Hee Lee, “Dynamic Modulation Scheme In Consideration of Cell Interference for LMDS,” ICCT’98, Oct 22-24, 1998.
[2] Gi-Sun Kim, “Modem technology for digital LMDS service,” Korea Electrics Technology Trans., vol. 25, Apr. 1998.
[3] Bussey, H. E.,” Microwave Attenuation Statistics Estimated from Rainfall and Water Vapor Statistics,” Proc. IRE, pp.781-785, 1950.
[4] ITU-R Recommendation 530-8, “ Propagation Data and Prediction Methods Required for the Design of Terrestrial Line-of-Sight Systems”, P series (2000).
[5] R. K. Crane, Electromagnetic Wave Propagation Through Rain, Wiley, New York, 1996.
[6] R.E. Ziemer, and W.H. Tranter, Principles of Communications: Systems, Modulation, and Noise, Wiley, New York, 2002.
[7] Kaivan Karimi, and Henry Helmken, “ A Study of Satellite Channel Utilization in the Presence of Rain Attenuation in Florida,” Creative Technology Transfer - A Global Affair., Proceedings of the 1994 IEEE ,1994.
[8] M. Filip, and E. Vilar, “Optimum Utilization of the Channel Capacity of a Satellite Link in Presence of Amplitude Scintillations and Rain Attenuation,” IEEE Trans. On Comm., Vol.38, pp.1958-1965, November 1990.
[9] Simon Haykin, Communication Systems 3/e, Wiley, New York, 1994.
[10] 謝光龍, ”Ka波段地面鏈路降雨效應與植被遮蔽效應之研究,” 國立中央大學太空科學研究所, 碩士論文, 2002.
[11] Bernard Sklar, Digital Communications: Fundamentals and Applications, Prentice-Hall, New Jersey, 1988.
[12] 簡裕潔, “LMDS系統受降雨衰減影響下之研究,” 國立中央大學電機工程研究所, 碩士論文, 2001.
[13] http://www.fcc.gov