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

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研究生：	彭紹桓 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 A New Cellular Architecture Base on a Rotated Base Station Concept in LMDS
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 - 電機工程學系 Department of Electrical Engineering
畢業學年度：	89
語文別：	中文
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：	LMDS, co-channel interference, frequency reuse, coverage ratio, bandwidth efficiency
相關次數：	點閱：4 下載：0
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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。

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

                                

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[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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