臺灣博碩士論文加值系統

在現今與未來的世界中，各式各樣的寬頻無線服務，例如多媒體及影像匯流串，將會廣泛的被應用。這些寬頻服務，包括 802.11 無線區域網路，使用W-CDMA技術的第三代行動通訊，以及架構在TDMA-GSM 技術上的EDGE系統，將不分室內戶外的提供寬頻的服務。在室內的環境中，尤其是廣大會議廳與工廠，常因內部家具之混雜性對電波造成的繞射與反射嚴重而引起收訊的惡化。本論文主要針對EDGE 系統使用之8-PSK調變在中大型會議廳或表演廳，使用64Kbps, 384Kbps, 2Mbps 資料傳輸速率進行系統效益之評估和相關誤碼機率之分析。典型的室內環境，我們選擇了國立中正文化中心所屬的國家戲劇院，做為我們進行室內電波量測實驗的場所。
在這篇論文中，我們同時進行寬頻與窄頻通道的現場量測，以便對信號振幅的變化和時間延遲擴散效應進行分析和通道模式的建立，爾後提供予系統作電腦模擬之用。在室內量測方面，依據現場建物的結構和不同的混雜阻隔物的陳列，分為A、B、C、D四區進行並蒐集資料。在通道特性方面，分別顯現具有Rician, Rayleigh 和 Log-normal(Slow Fading)三種現象。在上層觀賞台下沿呈現有較嚴重之高衰落Fast Fading 和 Slow Fading 之振盪頻率，其原因應來自於刀緣效應之繞射干擾。在電腦模擬中，利用這些地型，由位元錯誤率與符號錯誤率的觀點來進行 8-PSK 調變系統的效益評估。

Many broadband wireless services will likely be used for multimedia and data streaming, like WLAN 802.11, 3G-WCDMA, and TDMA GSM-based EDGE etc., within factories and conference hall. For “in-door” environments, signal received shows deteriorate effects caused by reflections and diffusion components from the surrounding interiors of building and local clutter type. The concert hall of National Theater in National CHIANG KAI-SHEK Culture Center is selected for this experiments where 8-PSK modulation performance is evaluated for 64kbps, 384kbps, and 2Mkbps data rates.
In our research, both narrow-band and wide-band measurements, corresponding to the amplitude fluctuating and time delay spread, were performed, respectively, to characterize the in-door radio channel amongst aisleways. From this medium to large sizes concert hall, multipath fading channel modeling and power delay profiles were generated in accordance to our empirical data. Various clutter obstructions and inter-building geographies has been identified and characterized through extensive measurements. The simulations utilized these models for analysis of 8-PSK, in terms of bit and symbol error rates, are also presented and compared. From the measurement results, Line-of-sight radio path appears to be not dominant, associated with reflections and diffusion components. Because of the large amount of clutters and waveguide effects from aisleways , diffusion effects results in the slow fading rate increasing is also apparent.

第一章 簡介.......................................1
第二章 通道模式與8PSK原理.........................4
2-1 多路徑現象.....................................5
2-2 直線波路徑衰減計算模式.........................9
2-3 Rayleigh衰落頻道...............................10
2-4 Rician衰落頻道.................................14
2-5 Log-normal分佈.................................17
2-6 8-PSK 原理.....................................20
2-7 8PSK設計步驟與相位的調變及解調變...............24
2-7-1 8PSK 調變器.................................24
2-7-2 8PSK 解調變器與相位偵測.....................27
2-8 平方根升餘弦濾波器.............................30
第三章 量測方法與資料收集.........................32
3-1 場強量測......................................33
3-1-1 場強量測使用設備.............................33
3-1-2 場強量測步驟及量測方法.......................36
3-1-3 數據收集.....................................38
3-2 頻道脈衝響應量測...............................39
3-2-1 STDCC 頻道脈衝響應法.........................43
3-2-1-1 STDCC相關聯參數和其定義....................44
3-2-2 擷取資料之內容與分析.........................46
3-2-3量測步驟......................................47
第四章 量測結果與分析 ............................48
4-1 電場量測的結果，與統計特性分佈圖...............48
4-2 功率延遲剖面圖(PDP)及延遲分析..................71
4-3 8-PSK調變方式，於此環境下的錯誤率分析..........78
4-3-1 以程式模擬方式產生調變訊號及通道.............78
4-3-2 Monte Carlo 估測程序.........................80
4-3-3 各定點錯誤率分析.............................81
4-3-4 第二路徑在各種不同延遲下之兩路徑模型錯誤率...89
4-4 問題與討論.....................................92
第五章 結論………………………………………………… 93
參考文獻 …………………………………………………… 95
中英文字詞對照表…………………………………………… 97

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