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研究生:陳義方
研究生(外文):CHEN YI FEN
論文名稱:無線通訊系統中線性調變方法工作於不同衰落環境時之LCR與AFD效益研究
論文名稱(外文):Study on LCR and AFD Performance of Linear Modulator Operating in Different Fading Envirnments for Wireless Communication Systems
指導教授:陳雍宗陳雍宗引用關係
指導教授(外文):YONG-ZONG CHEN
學位類別:碩士
校院名稱:大葉大學
系所名稱:電信工程學系碩士在職專班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:95
語文別:中文
論文頁數:84
中文關鍵詞:MRCSC平均準位跨越率平均衰落區間Nakagami-m
外文關鍵詞:AFDLCRSCMRCEGC diversitycorrelated fadingNakagami-m fading
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本論文旨在利用平均準位跨越率(Average level crossing rate, LCR)和平均衰落區間(Average fade duration, AFD)的效能評定方式,假設線性分集(Linear diversity)方法,包含最大比例合成(Maximal Ratio Combinig, MRC)和選擇性合成(Selection Combining, SC)工作於相關性中上分布(Correlated-Nakagami-m)環境時的效能。除外,接收分支間皆假設存在相關特性。經由傳統的LCR與AFD之效能定義公式推導外,本研究論文亦收錄了各種工作環境通道的衰落分布,其中涵蓋獨立分支與相關分支。最後並推導Nakagami-m分布衰落環境中工作的完成式(Closed-form),並藉由數值分析以驗證本論文研究推導公式的正確性,互相比對驗證,使最後所得之數
值的可靠性得以提高。
The purpose of this article is on the performance evaluation with the methods of average LCR(Level Crossing Rate)and AFD (average fade duration ) for some linear diversities include MRC (maximal ratio combining) and EGC (equal gain combining) diversity. The working environment is assumed as correlated-Nakagami-m statistics, that is, the correlation characteristics is assumed existing between the received branches. Besides, the presentation of LCR and AFD for the conventional linear diversity are involved, such as, MRC and SC (selection combining), combination with different operating environments. Finally, by using of numerical analysis for validating the accuracy of the derived formulas are conducted. It is reasonable to note that the MRC diversity still owns the superior performance than the other two from the view point of LCR and AFD.
目錄

封面內頁
簽名頁
授權書.........................iii
中文摘要........................iv
英文摘要........................v
誌謝..........................vi
目錄..........................v
圖目錄.........................viii
符號說明........................x
表目錄.........................xiv

第一章 緒論
1.1研究動機與目的................1
1.2論文綱要...................2
第二章 無線通訊衰落通道
2.1電波傳輸現象.................3
2.1.1反射..................4
2.1.2繞射..................4
2.1.3散射..................5
2.2衰落的分類..................5
2.2.1大尺度衰落...............6
2.2.1.1路徑損耗............7
2.2.1.2遮蔽效應............10
2.2.2小尺度衰落..............10
2.2.2.1時間延遲擴散..........11
2.2.2.2時域上的變動性.........13
2.3衰落通道的數學模型.............15
2.4常用通信波道統計分佈介紹與比較.......16
2.4.1 Normal(Gaussian)衰落分佈.......17
2.4.2 Rayleigh衰落分佈...........20
2.4.3 Rice衰落分佈.............22
2.4.4 Nakagami衰落分佈...........27
2.4.5 Wiebull衰落分佈...........30
第三章 平均準位跨越率與平均衰落區間
3.1 都卜勒效應.................36
3.2 平均準位誇越率(LCR)與平均衰落區間(AFD) ..40
3.2.1平均LCR與AFD之物理意義......41
3.2.2平均LCR與AFD之定義........42
第四章 分集合成後之效能分析
4.1分集合成後之效能通式...........45
4.1.1 選擇性分集合成後之平均LCR與AFD...45
4.1.1.1獨立性分支...........45
4.1.1.2 相關性分支...........48
4.1.2 最大比例合成分集後之平均LCR與AFD..50
4.1.2.1獨立性分支...........50
4.1.2.2 相關性分支...........52
4.2 各種通道經具獨立選擇性合成分支之平均LCR 及AFD...................54
4.2.1 Rayleigh,Rice及Nakagami通道下之效能分
析.................54
4.2.2 Weibull通道下之效能分析.......57
4.2.2.1 獨立性分支...........57
4.2.2.2 相關性分支...........61
4.3 數值分析結果...............64
第五章 Nakagami-m通道中LCR與AFD之分析結果....67
5.1敍述平均準位跨越率和平均衰落區間......67
5.2 雙分支MRC合成之LCR與AFD 的效能分析..67
5.3 雙分支SC合成之LCR與AFD的分析.....71
5.4 數值分析結果...............73
第六章 結論......................77
附錄..........................78
參考文獻........................80
參考文獻

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