臺灣博碩士論文加值系統

多輸入多輸出網絡（Network Multiple-Input Multiple-Output, Network MIMO）是為了減少細胞間的干擾以及利用多個細胞間的協同傳輸來增加細胞邊緣使用者（Cell-Edge User, CEU）的效能，近來有越來越多關於多輸入多輸出網絡以及蜂巢式系統之部分頻率重用（Fractional Frequency Reuse, FFR）的研究，然而，這些研究並未注意到細胞扇型區域劃分（cell sectorization）與系統容量之間的關係，另一個重要議題是關於多點協同傳輸情境下的功率管理問題，因為在這情境下基地台會同時服務細胞內使用者以及利用限定的功率大小來服務相鄰細胞的細胞邊緣使用者。本文研究了細胞扇型區域切割以及基於多輸入多輸出網絡與部分頻率重用的功率控制管理。模擬結果顯示我們提出的功率控制管理方式可以有效的提升其他細胞共同服務的細胞邊緣使用者的訊號品質，另外也不會降低本身細胞內使用者的效能。此外，結果也顯示出了我們提出的新的細胞扇型區段切割方式在多點協同傳輸情性下可以有效減少細胞中心使用者所受到的干擾，也可以有效增加細胞邊緣使用者的訊號品質。

Network multiple-input multiple-output (MIMO) aims to mitigate the inter-cell interference and improve the performance of cell-edge users (CEUs) through a multi-cell cooperative transmission. The study of network MIMO on top of the fractional frequency reuse (FFR) cellular system has recently attracted more research attention. However, they were not aware that how cell sectorization is done can cause a great influence on system capacity. Another important topic rarely seen is power management for a multi-cellular coordination scenario, where each BS has to simultaneously serve its intra-cell users and some inter-cell CEUs using a limited amount of power. This paper investigates the cell sectorization and power management on top of FFR-based network MIMO systems. Simulation results show that the proposed power management can improve the signal quality of other cells’ CEUs and meanwhile not degrade the performance of intra-cell users. It is shown that there exists a method of sectorization that causes less interference to cell-center users (CCUs) and offers better signal quality to CEUs in a multi-cell cooperative transmission.

中文摘要 i
英文摘要 ii
誌 謝 iii
目 錄 iv
表 目 錄 vi
圖 目 錄 vii
一、緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 研究方法 4
1.4 論文架構 5
二、無線通道傳輸與干擾管理問題 6
2.1 正交分頻多工系統 6
2.2 多輸入多輸出網絡系統 8
2.3 頻率重用策略 9
2.3.1 軟式頻率重用 10
2.3.2 部份頻率重用 11
2.4 無線通道模型 11
2.4.1傳播路徑損耗 12
2.4.2大範圍衰落 15
2.4.3小範圍衰落 16
三、系統架構 20
3.1 細胞架構 20
3.2 路徑損耗與遮蔽效應模型 22
3.3 通道訊號模型 23
四、研究方法 25
4.1 細胞扇形區域劃分 25
4.2 多輸入多輸出網絡的頻率重用策略 27
4.3 傳送功率管理 33
五、模擬結果 35
六、結論 46
附錄一 47
附錄二 48
參考文獻 51

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