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研究生:彭紹桓
研究生(外文):Oscar Peng
論文名稱:利用旋轉基地台的觀念來提出一個在LMDS上的新細胞式架構
論文名稱(外文):A New Cellular Architecture Base on a Rotated Base Station Concept in LMDS
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:電機工程研究所
學門:工程學門
學類:電資工程學類
論文出版年:2001
畢業學年度:89
語文別:英文
論文頁數:55
中文關鍵詞:區域多點資訊分送服務同頻干擾頻率重複使用涵蓋比率頻寬效率
外文關鍵詞:LMDSco-channel interferencefrequency reusecoverage ratiobandwidth efficiency
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在區域多點資訊分送服務 (Local Multipoint Distribution Service, LMDS) 系統下,同頻干擾 (co-channel interference) 是個限制系統容量 (capacity) 重要因素。為了降低同頻干擾的影響,在這篇論文中我們提出了一個旋轉基地台的概念。利用此旋轉基地台概念所形成的新細胞式架構可以增加系統的效能 (performance),但不需增加系統設備的費用。
另外,本文介紹頻率重複使用 (frequency reuse) 的觀念,比較三個頻率重複使用因子 (reuse factor) 的系統。結果顯示較低頻率重複使用因子的系統可以得到最佳的涵蓋比率 (coverage ratio) 效能。較高頻率重複使用因子的系統可以得到較佳的頻寬效率 (bandwidth efficiency) 效能,也就是說,用戶的數目可以增加。此外,利用旋轉基地台的概念不僅可以增加涵蓋比率的效能,也可以增加頻寬效率的效能。所以在LMDS的系統下,旋轉基地台是個非常有用的方法來降低同頻干擾,並且增加系統的頻寬效率。

In Local Multipoint Distribution Service (LMDS) system, co-channel interference is the limiting factor in determining the capacity. In order to reduce co-channel interference, we introduce the concept of rotated base station (BS) architecture. The proposed architecture with rotated BS can enhance the system performance without raising the cost.
We also introduce the frequency reuse concept. We compare systems with reuse factor = 1, 2 and 4. The results show that the lower reuse factor system can get the better performance of coverage ratio. The higher reuse factor system can get better performance of bandwidth efficiency, that is, the number of subscribers can increase. Furthermore, the rotated base station concept can get better performance of coverage ratio and bandwidth efficiency. Therefore, the base station rotation is a very useful concept to reduce co-channel interference and increase bandwidth efficiency in the LMDS system.

Chapter 1 Introduction........................................1
1.1 Research background.....................................1
1.1.1 LMDS...........................................1
1.1.2 Cell planning..................................2
1.1.3 Link budget....................................2
1.2 Research motivation.....................................3
Chapter 2 System Architecture.................................4
2.1 Conventional architecture...............................4
2.1.1 Co-channel Interference........................5
2.2 Proposal architecture...................................7
2.2.1 Site layouts and channel assignment scheme.....8
Chapter 3 Performance Analysis between Conventional and Proposed Architectures........................................11
3.1 Coverage ratio.........................................11
3.2 Effects of beam-width..................................14
3.3 Effects of front-to-back ratio.........................16
3.4 Sensitivity to location variation......................21
3.4.1 Simulation approach...........................21
3.4.2 Simulation results............................22
Chapter 4 Frequency Reuse Analysis...........................26
4.1 Frequency reuse system.................................26
4.2 Lower reuse factor system..............................29
4.2.1 Co-channel Interference.......................29
4.2.2 Rotated base station concept..................29
4.2.3 Effects of front-to-back ratio and beam-width.32
4.3 Higher reuse factor system.............................37
4.3.1 Co-channel Interference.......................37
4.3.2 Rotated base station concept..................38
4.3.3 Effects of front-to-back ratio and beam-width.41
4.4 Comparison between frequency reuse system..............45
4.4.1 Effects of front-to-back ratio................45
4.4.2 Effects of bandwidth efficiency...............48
Chapter 5 Conclusions........................................52

[1] Chang-Hoon Lee,Boo-Young Chung,Su-Hee Lee, "Dynamic Modulation Scheme In Consideration of Cell Interference for LMDS," International Conference on Communication Technology, pp.1-5, October 1998.
[2] Douglas A. Gray, "A Broadband Wireless Access System at 28 GHz," Wireless Communication Conference, pp.1-7, 1997.
[3] K V Ravi and P Soma, "Analysis And Modeling of Local Multipoint Distribution Service (LMDS) Channel," Global Telecommunications Conference-Globecom’99, pp.873-877.
[4] Vincentzio Roman, "Frequency Reuse and System Deployment in Local Multipoint Distribution Service," IEEE Personal Communications, December 1999, pp.20-27.
[5] 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, pp.89-102.
[6] S. Farahvash, M. Kavehrad, "Assessment of Co-channel Interference in Fixed Wireless Cellular Systems," IEEE, 1999, pp.13-16.
[7] Jin Young Kim, "Parallel Concatenated Convolutional Coding for a Local Multipoint Distribution Service System," IEEE Transactions on Consumer Electronics, Vol. 46, No. 1, February 2000, pp.154-160.
[8] Peter B. Papazian, George A. Hufford, Robert J. Achatz, Randy Hoffman, "Study of the Local Multipoint Distribution Service Radio Channel," IEEE Transactions on broadcasting, Vol. 43, No. 2, June 1997, pp.175-184.
[9] Hikmet sari, "Some Design Issues in Local Multipoint Distribution Systems," IEEE, 1998, pp.13-19.
[10] Hikmet sari, "A Multimode CDMA Scheme with Reduced Intercell Interference for LMDS Networks," IEEE, 2000, pp.307-312.
[11] Li-Chun Wang, "A New Cellular Architecture Based on an Interleaved Cluster Concept," IEEE Transactions on Vehicular Technology, Vol. 48. No. 6. November 1999, pp.1809-1818.
[12] Harry R. Anderson, Ph.D., P.E. "Simulations of Channel Capacity and Frequency Reuse in Multipoint LMDS Systems," IEEE, 1999, pp.9-12.
[13] Gerald K. Chan, “Effects of Sectorization on the Spectrum Efficiency of Cellular Radio Systems,” IEEE Transactios on Vehicular Technology, Vol. 41, No. 3, August 1992.

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