區域多點分配服務下鏈方向細胞間干擾的降低｜國立中央大學博碩士論文系統

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研究生：	邱慶俊 Ching-Jiun Chiou
論文名稱：	區域多點分配服務下鏈方向細胞間干擾的降低 Inter Cell Interference Reduction of LMDS for the downlink direction
指導教授：	蔡木金 Mu-King Tsay
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 通訊工程學系 Department of Communication Engineering
畢業學年度：	93
語文別：	英文
論文頁數：	53
中文關鍵詞：	區域多點分配服務、細胞間干擾、下鏈方向
外文關鍵詞：	downlink, LMDS, Inter Cell Interference
相關次數：	點閱：8 下載：0
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在無線細胞系統中，同頻干擾效應對於系統效能來說是一個限制的因素，區域多點分配服務系統(Local Multipoint Distribution System, LMDS)，這種固定的無線傳輸系統也不例外。在LMDS中下鏈通常是較高容量的，而且較窄的用戶端天線的波束也是排拒同頻干擾(Co-channel interference)的一項因素。因此對LMDS中的下鏈方向同頻干擾的評估是本篇論文的主題。
為了有效降低LMDS中細胞間干擾的問題，在這篇論文中提出用戶端天線重新指派方向的觀念，利用此種方法可以獲得較少的細胞間干擾區間，進而增加系統的效能。

In wireless cellular systems, co-channel interference is the limiting factor to system performance. Fix wireless systems such as Local Multipoint Distribution Systems (LMDS) are no exception to this rule. Because the LMDS downlink is usually higher-capacity and beam-width of subscribers’ antenna is narrow beam width, therefore co-channel interference in downlink is more serious. This thesis proposes a concept of subscribers’ antenna reorientation to reduce this interference. Using this scheme, we can reduce the interfering regions and improve the system performance.

Contents                                            I
List of Figures                                     III
List of Tables                                      V
Chapter 1. Introduction                             1
1-1. Local Multipoint Distribution Service (LMDS) 1
1-1-1. Introduction to the meaning of LMDS     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
2-2. Inter-Cell interference calculation          8
2-2-1.The well-know radio formula              8
2-2-2. ITU-R Rain Attenuation Prediction Model 9
2-2-3. Cross-polarization Discrimination (XPD) 13
2-3. Layout of Cellular Configuration             14
2-3-1. System Deployment Trade-offs            14
2-3-2. Frequency Reuse                         15
2-3-3. Alternating Polarizations               16
2-3-4. Cell Planning of LMDS                   17
2-4. Link Budget Calculation                      18
Chapter 3. System Architecture                      20
3-1.Typical architecture                          20
3-1-1. Co-channel interference                 21
3-2. Rotated base station architecture            25
3-2-1. Site layouts and channel assignment scheme   25
3-3. Proposed architecture                        29
Chapter 4. Performance Analysis among Typical, Rotated Base Station and Proposed Architectures                              33
4-1.Coverage ratio                                33
4-2. Effects of beam-width                        34
4-3. Effects of XPD                               37
4-4. Effects of threshold of reorientation        42
4-5. Effects of rain rate                         45
4-6. Sensitivity to location variation            48
4-7. Effect degrees of beam-width, XPD, rain fade 50
Chapter 5. Conclusions                              51
References                                          52

                                

References
[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,

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