IEEE 802.16e WiMAX (Worldwide Interoperability for Microwave Access) 全球互通微波存取規範是一個全新的通訊系統，在台灣也開始架設許多的基站，在基站中不同的參數設定對於系統容量影響以及涵蓋率的影響是我們所關心的議題，本論文將研究常用的網路服務模式建立其流量模型(Traffic model)，並研究使用者人數對於系統的負載，最後計算出在不同服務比率下使用者人數的上限，並研究傳輸衰減(Path loss)與雜訊干擾導致的位元錯誤率以及區塊錯誤率，以此推算出系統經過傳輸後的實際效能，最後將開發出圖形使用者介面(Graphical User Interfaces, GUI)提供前述的模擬運算，以幫助我國未來發展WiMAX系統。

The 802.16e WiMAX (Worldwide Interoperability for Microwave Access) standard is a brand new communication system, In Taiwan many WiMAX base station have been installed. The main issue for engineers to consider is how to set and adjust the relevant parameters of the base station so as to have the system to reach its highest capacity. In this thesis we will study and develop the traffic models such as VoIP, video streaming and web browsing that are the main services will be provided by the WiMAX system. We will also study the effect of varying the number of users of various services on the system capacity and compute the maximum number of users the system can support for a given percentage of mixes of services. Then we will study the effects of path loss and noise interference on the system bit error rate (BER) and block error rate (BLER) so as to compute the possible system capacity and to find the possible coverage area of the base station when the data is transmitted through the system. Finally we will develop a Graphical User Interfaces (GUI) to provide a visual depict of the aforementioned simulation results.

目錄
第一章 緒論 ………………………………………1
1.1 研究動機與目的 ……………………………………1
1.2 章節介紹 …………………………………………2
第二章 WiMAX 系統模型………………….……....3
2.1 WiMAX 系統介紹 ………….…………………….…..3
2.2 WiMAX系統參數設定……………………...…….…...4
2.3 WiMAX 基站Admission 參數設定模擬…...…….......7
2.4 WiMAX流量模型建立……………………...…….…...8
2.4.1 VoIP 模型……………………...…….…................8
2.4.2 串流影音模型......……………………...…….…12
2.4.3 網頁模型... .........................14
2.3.4 建立流量模型模擬環境........................... 15
第三章 WiMAX 系統模擬分析與模擬…………..18
3.1 通道衰減模型..…..…..…..…..…..……….…………18
3.1.1 cost-231 衰減模型..…..…..…..…..…..…..…...18
3.2 訊雜比與封包錯誤率計算…………………………..20
第四章 WiMAX 系統模擬軟體之實現…………...24
4.1 模擬軟體界面說明……………..…………….. …….24
4.2 模擬與效能分析…………….. …………….. ……….31
第五章 結論…………………………………………33
參考文獻………………………………………………34
圖目錄
圖2.1 PUSC 資料與Pilot 設定方法………………………………… 6
圖2.2 VoIP 動作示意圖 …………………………………….….….9
圖2.3 VoIP 狀態圖 …………………………………….….….....9
圖2.4 狀態持續時間機率分佈圖 …………………………………10
圖2.5 延遲抖動機率分佈圖 ………………………………………10
圖2.6 VoIP 模擬範例 ……………………………………11
圖2.7 串流影音動作圖 …………………………………12
圖2.8 Pack size 機率分佈圖…………………………………13
圖2.9Arrival time 機率分佈圖…………………………………..13
圖 2.10 串流影音的流量模型…………………………………....14
圖 2.11 HTTP 動作示意圖………….……………………….......14
圖2.12 流量模型模擬結果(600 sec) ……………………………….... 17
圖2.13 流量模型模擬結果(10 sec) ………………………………....... 17
圖3.1 cost-231 模型中訊號衰減……………………………….............19
圖3.2 修正的cost-231 模型中訊號衰減………………………………20
圖 3.3 訊雜比與距離關係圖………………………………................21
圖3.4 SNR 與SER 關係圖………………………………......................22
圖3.5 訊雜比與區塊錯誤率………………………………..................22
VII
圖3.6 訊雜比與區塊錯誤率(Code block size = 256 bytes) …………23
圖3.7 不同調變的訊雜比與區塊錯誤率圖………………………… 23
圖4.1 系統效能模擬介面介紹………………………………............26
圖4.2 服務與容量計算工具介紹………………………………...........29
圖4.3 距離與傳輸率關係圖………………………………..................31
圖4.4 Admission 參數與使用者人數關係圖………………………32
圖4.5 Admission 參數與系統容量關係圖…………………………32
表目錄
表2.1 子載波指定的資訊……………………………………………4
表2.2 系統基本參數設定…………………………………………5
表2.3 應用與QoS 類型………………………………………………... 6
表2.4 基站可設定之Admission 參數與預設值………………………7
表2.5 聲音編碼資訊………………………………………………........8
表2.6 VoIP 流量模型參數 ……………………………………………10
表2.7 G.729 封包預估大小(以20ms 為間距) …………………………11
表2.8 串流影音的流量模型………………………………………12
表2.9 HTTP 流量模型參數表………………………………………16
表3.1 接收訊雜比與調變碼率關係…………………………………21

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