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研究生:張兆昌
研究生(外文):Chou-Chun Chang
論文名稱:區域多點分配服務使用分碼多重擷取技術細胞間干擾分析
論文名稱(外文):The Analysis of ISI on LMDS using O-CDMA with Code Arrangement
指導教授:蔡木金
指導教授(外文):Mu-King Tsay
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:58
中文關鍵詞:分碼多重擷取細胞間干擾區域多點分配服務
外文關鍵詞:LMDSO-CDMAinterference
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在各項微波傳輸技術中,LMDS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,因此更具有彈性及擴充性。台灣在2000年發放固網執照,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。然後討論和比較加上干擾碼與未加干擾碼的不同。並分析分碼多重擷取加上功率控制的技術,以減少受到的干擾。接著討論動態調變在LMDS環境的影響,我們可以使用較高階的調變器在通道品質較好的時候來增加系統可負載的資料速率。
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.
In this article, we first analyze interference in O-CDMA system. The performance of system with and without scrambling code will be compared. Of course, the technique of power control will be applied to reduce inter-cell interference effect. Besides, high rainfall attenuation is a significant challenges associated with deploying systems at Ka band. And with dynamic modulation scheme, we can choose the mode to be modulated according to channel situation.
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 system 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
2-1-3. The Well-know Radio Formula 8
2-1-4. Simple discussion of interference on O-CDMA system 9
2-2. Layout of Cellular Configuration 10
2-2-1. System Deployment Trade-offs 10
2-2-2. Frequency Reuse 10
2-2-3. Alternating Polarizations 12
2-2-4. Cell Planning of LMDS 13
2-2-5. Inter-cell Interference of LMDS 14
2-3. Link Budget Calculation 16

Chapter 3. Analysis of Interference in LMDS 18
3-1. Application of CDMA 18
3-2. Interference on OCDMA 21
3-3. CDMA with Power Control 30
3-4. Dynamic Modulation in LMDS 35
3-4-1. Dynamic Modulation Scheme 35
3-4-2. Error Probabilities of Some Modulation Schemes 37

Chapter 4. Simulation Results 40
4-1. System without scrambling code using PC 40
4-2. Performance of Sector Type 2 43
4-3. Dynamic modulation 47

Chapter 5. Conclusions 55

References 56
References


[1] Gray Douglas A. "A Broadband Wireless Access System at 28 GHz," IEEE, 11-13 Aug. 1997. Pages:1 - 7

[2] S. Farahvash; 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] Diakoumis Gerakoulis ; Saeed Ghassemzadeh ; “Extended Orthogonal Code Designs with Applications in CDMA” ; Volume: 2 , 6-8 Sept IEEE, 2000. Pages: 657 - 661

[4] Parsons J. D., The Mobile Radio Propagation Channel, John Wiley &
Sons, 1998.

[5] Lee Chang-Hoon, Boo-Young Chung, Su-Hee Lee, "Dynamic Modulation Scheme in Consideration of Cell Interference for LMDS," ICCT’98, October 22-24, 1998.

[6] Hikmet Sari, “A Multimode CDMA Scheme with Reduced Intercell Interference for LMDS Networks”, IEEE, 15-17 Feb. 2000. Pages: 307 - 312


[7] Esmael H. Dinan and Bijan Jabbari, "Spreading Codes for Direct Sequence CDMA and Wideband CDMA Cellular Networks," IEEE Communications Magazine, September 1998. Pages: 48 - 54

[8] J. Li; M. Kavehrad; “A Multiple Access scheme for LMDS Based on OFDM, O-CDMA and Sectored Antenna” ; IEEE, 6-10 June 1999 Pages:162 - 166 vol.1

[9] Wai-Man Tam; Lau, F.C.M.; “Analysis of power control and its imperfections in CDMA cellular systems”; Vehicular Technology, IEEE Transactions on , Volume: 48 Issue: 5 , Sep 1999 Pages: 1706 - 1717

[10] 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 , 7-11 Oct, 2001 Pages:1653 - 1657

[11] Ziemer R. E., W. H. Tranter, Principles of Communications, Houghton Mifflin Company, 1995.

[12] Sklar Bernard, Digital Communications, P T R Prentice Hall, 1988.

[13] W.C.Y. Lee, Mobile Communication Engineering. McGraw-Hill, 1982
[14] Seokjoo Shin; Kyounghwan Lee; Kiseon Kim; “Performance of the packet data transmission using the other-cell-interference factor in DS/CDMA downlink”; Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE , Volume: 1 , 17-21 Mar 2002 Pages:400 - 404

[15] Roman, V.I. “Frequency Reuse and System Deployment in Local Multipoint Distribution Service” IEEE Personal Communications Volume: 6 6 , Dec. 1999 Pages:20 - 27

[16] Hao Xu; Rappaport, T.S.; Boyle, R.J.; Schaffner, J.H., “Measurements and Models for 38-GHz Point-to-Multipoint Radiowave Propagation”, Selected Areas in Communications, IEEE Journal on Volume: 18 3 , March 2000 Pages:310 - 321
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