臺灣博碩士論文加值系統

當災區內通訊中斷，使用飛行器搭載中繼系統，作為臨時基地台是一個可行的方案。此外，考慮災區人員較多，為了增加通道容量，中繼器將使用多天線的多輸入多輸出(MIMO)系統。本文模擬災區的無線通道特性，首先估測MIMO中繼通道的功率損耗，以制定中繼系統的最大功率增益，其次為評估2x2x2通道系統的通道容量。一般的二維無線通道模型在平面上建模，無法考慮中繼站的高度，與災區障礙物的高低起伏。本文引用文獻的模型去建構一個二維通道模型與一個三維通道模型，並比較兩者的模擬結果。三維通道模型加入了中繼站高度與災區障礙物的高度分佈。
在本文的模擬中，將設定幾種災區通訊的環境，並使用兩種通道模型來估測功率損耗、通道的空間相關係數，以及遍歷性通道容量。最後將根據結果，得知在吾人設定的通道環境下，使用二維通道模型與三維通道模型的差別不明顯。

When communication is disable in the disaster areas, using relay system via aerial platforms as a temporary base station is a viable solution. Furthermore, we consider that there are a lot of people in the disaster areas. In order to in-crease channel capacity, relay station equipped with multiple-input multi-ple-output(MIMO) system is required. In this paper, the wireless channel characteristics were simulated. First, we studied the signal fading in the channel to evaluate the gain needed in the relay system. Secondly, we estimate channel capacity of 2x2x2 MIMO relay channel system. The typical two-dimensional wireless channel modeling on the plane can not be considered the height of the relay station and undulating height of the disaster obstacle. According to the reference models, a two-dimensional and a three-dimensional relay MIMO channel models are modeled to compare estimate results of both model. The height of the relay station and height distribution of the disaster obstacle are joined in three-dimensional channel model.
In the simulations of this paper, we set several conditions for the disaster communications. Two kinds of proposed model are used to estimate path loss, spatial correlation coefficient ,and ergodic capacity. Based on the results , the data differences between using two-dimensional model and using three-dimensional are not significant in our applications.

中文摘要......................................I
Abstract.................................... II
謝誌.........................................III
目錄..........................................IV
圖目錄.........................................V
表目錄........................................VI
第一章 緒論................................... 1
1.1 研究動機.................................. 1
1.2 系統架構.................................. 3
1.2.1 工作頻段................................ 3
1.3 論文架構.................................. 6
第二章 文獻探討................................ 7
2.1 瑞利通道的文獻探討.......................... 7
2.2 MIMO 通道的文獻探討.........................10
2.3 MIMO 中繼站通道的文獻探討....................13
2.4 三維通道的文獻探討......................... 15
第三章 通道模型介紹............................ 18
3.1 二維通道模型介紹........................... 18
3.1.1 二維通道的路徑長度推導.................... 23
3.1.2 二維通道的隨機分佈函數.................... 25
3.2 三維通道模型介紹........................... 28
3.2.1 三維通道的路徑長度推導.................... 33
3.2.2 三維通道的隨機分佈函數.................... 37
3.3 系統模擬的通道模型......................... 39
第四章 模擬結果................................ 41
4.1 通道環境參數設定........................... 41
4.2 路徑..................................... 43
4.3 MIMO 通道相關係數的模擬結果................ 50
4.3.1 不同天線間距的空間相關(Spatial Correlation) .. 50
4.3.2 不同高度時三維通道的空間相關.............. 54
4.3.3 不同方位角時通道的空間相關............. 56
4.3.4 改變三維通道天線傾斜角的空間相關......... 59
4.4 SIMO 系統的通道相關...................... 61
4.5 二維通道模型與三維通道模型的相關性模擬....... 64
4.6 二維通道與三維通道的通道容量模擬............ 70
第五章 結論.................................. 74
參考文獻..................................... 76

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