博碩士論文 107522079 詳細資訊




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姓名 李育丞(Yu-Cheng Li)  查詢紙本館藏   畢業系所 資訊工程學系
論文名稱 一種減輕LEO衛星網路干擾的方案
(An Interference Mitigation Scheme for LEO Satellite Networks)
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摘要(中) 地面5G毫米波通訊基地台與使用Ka頻段低軌道衛星(Low Earth Orbit, LEO) 有部分頻段重疊,會造成同頻率干擾。同頻率干擾可分為兩種類型:衛星波束之間的干擾、地面通訊與衛星之間的干擾。過去常用的靜態分頻方式雖然減少了干擾,但是犧牲了資源利用率,且不適用於現今的低軌道衛星場景。由於低軌道衛星高速移動的特性,地面基地台受到低軌道衛星干擾的頻段亦頻繁改變。本論文考慮低軌道衛星使用波束跳躍(Beam Hopping) ,以降低衛星波束之間的干擾,並使用全頻率複用(Full Frequency Reuse) 以提升衛星傳輸效率。在我們的方法中,為提升地面傳輸率會額外使用衛星頻段,但這會導致地面基地台干擾衛星使用者。地面基地台會根據低軌道衛星的移動動態地調整其重疊頻段上傳輸功率大小或是分配ABS 樣式,以減少地面基地台對衛星接收端的干擾。最後模擬結果顯示,我們的方法增加了整體傳輸率且也降低的對衛星使用者的干擾。
摘要(英) The terrestrial base station with millimeter-wave and Ka band LEO satellite overlap partial frequency band, and exist the cochannel interference. The cochannel interference can be divided into two types: interference between satellite beams, and interference between terrestrial networks and satellites. Although the previously fixed frequency division method reduces the interference, it sacrifices spectral efficiency and is not suitable for LEO satellite scenarios. Due to the highspeed movement of LEO satellites, the frequency band of terrestrial base stations interfered by LEO satellites also changes frequently. This paper considers adopting Beam Hopping to reduce interference between satellite beams, and using Full Frequency Reuse to improve satellite spectral efficiency. In our method, the terrestrial base stations will additionally transmit in the satellite frequency band to enhance the data rate, but this will cause terrestrial base stations to interfere with satellite users. The terrestrial base station will dynamically adjust the transmission power in the overlapping frequency band or allocate the ABS pattern according to the movement of the LEO satellite to mitigate the interference with the satellite users. Finally, the simulation shows that our methods enhance the data rate and mitigate the interference.
關鍵字(中) ★ 低軌道衛星
★ 同頻干擾
★ 波束跳躍
★ 頻率複用
關鍵字(英) ★ LEO satellite
★ Co-channel interference
★ Beam Hopping
★ Frequency reuse
論文目次 中文摘要 i
Abstract ii
Acknowledgments iii
Contents iv
List of Figures vi
List of Tables vii
1 緒論 1
2 研究背景 5
2.1 降低衛星波束間干擾. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 降低地面與衛星間干擾. . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 系統模型 11
3.1 架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 下行鏈路計算. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2.1 衛星使用者. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2.2 地面使用者. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 資源分配. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 方法 18
4.1 降低衛星波束之間干擾. . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1.1 波束跳躍. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 降低地面與衛星之間干擾. . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2.1 軟頻率複用與功率調整. . . . . . . . . . . . . . . . . . . . . . 23
4.2.2 幾乎空白子訊框. . . . . . . . . . . . . . . . . . . . . . . . . . 24
5 實驗模擬 25
5.1 環境場景. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 效能衡量. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 單一場景. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3.1 訊噪比. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3.2 資料傳輸率. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 波束跳躍. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.4.1 需求流量與給予流量. . . . . . . . . . . . . . . . . . . . . . . 35
6 結論 39
Bibliography 40
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指導教授 何錦文 張貴雲(Chin-Wen Ho Guey-Yun Chang) 審核日期 2020-8-20
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