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研究生:馮惠銘
研究生(外文):Hui-Ming Ming
論文名稱:利用LCR與AFD方法評估SC合成工作於衰落通道中的比較與研究
論文名稱(外文):Comparison and Investigation with LCR and AFD Methods to Estimate the Selection Combining Working in Generalized Fading Channels
指導教授:陳雍宗陳雍宗引用關係
指導教授(外文):Joy Iong-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:2006
畢業學年度:94
語文別:中文
論文頁數:82
中文關鍵詞:RayleighRicianNakagami-mWeibull衰落通道選擇性分集合成平均凖位跨越率平均衰落區間
外文關鍵詞:RayleighRicianNakagami-mWeibull Fading ChannelSC DiversityLCRAFD
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在這篇文章裡,平均平均準位跨越率(LCR)和平均衰落區間(AFD)標準的效能値被應用於分析選擇性合成(SC)分集。其中衰落通道模型擁有Rayleigh和Rician分佈統計的特性,研究過程中,我們考慮了分支之間都互相獨立(independent)和相關(correlated)關係。在SC分集中為了比較不同衰落通道之平均LCR和AFD之效能,其中某些研究成果已在論文中呈現,而且也置入以雙分支Nakagami-m和Weibull分佈通道之統計分佈衰落現象中的LCR與AFD之效能。
In this paper the performance evaluation with the average LCR (level crossing rate) and AFD (average fading duration) criterion are applied to analyze the SC (selection combining) diversity. The fading channel models are characterized as Rayleigh and Rician distributed statistics. Both of the independent of branches and the correlation proprieties between branches are considered in this investigation. In order to compare the performance results between the different fading channels for SC with average LCR and AFD performance, it is not only the results from our study presented, but the propagation fading channels are with dual-branch Nakagami-m and Weibull statistics that have been presented are also shown in this study.
目錄

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博碩士論文電子檔案上網授權書........iii
中文摘要........iv
英文摘要........v
致謝........vi
目錄........vii
圖目錄........x
表目錄........xiii

第一章 結論........1
1.1 研究動機........1
1.2 論文大綱........4
第二章 平均凖位跨越率與平均衰落區間........5
2.1 都卜勒(Doppler)效應........5
2.2 平均LCR與AFD........9
2.2.1 平均LCR與AFD之物理意義........9
2.2.2 平均LCR與AFD之定義........11
第三章 無線通訊之衰落通道........14
3.1 電波傳輸現象........14
3.1.1 反射........15
3.1.2 散射........15
3.1.3 繞射........16
3.2 一般衰落的分類........16
3.2.1 小尺度衰落........17
3.2.2 大尺度衰落........18
3.2.2.1 路徑損耗........19
3.2.2.2 遮蔽效應........22
3.3 衰落通道之數學模型........22
3.4 常用通信通道統計分佈........24
3.4.1 Normal(Gaussian)衰落分佈........25
3.4.2 Rayleigh衰落分佈........26
3.4.3 Rician衰落分佈........28
3.4.4 Nakagami-m衰落分佈........31
3.4.5 Weibull衰落分佈........33
第四章 分集合成後之效能分析........38
4.1 各種通道在未分集合成下之平均LCR與AFD........38
4.2 分集合成技術........43
4.2.1 時間分集........44
4.2.2 空間分集........46
4.2.2.1 選擇性合成(Selection Combining)........47
4.2.2.2 等增益合成(Equal Gain Combining)........48
4.2.2.3 最大比例合成(Maximal-Ratio
Combining)........49
4.3 分集合成後之效能通式........51
4.3.1 選擇性分集合成後之平均LCR與AFD........51
4.3.1.1 獨立性分支........52
4.3.1.2 相關性分支........54
第五章 具獨立與相關選擇性合成分支之平均LCR與AFD........57
5.1 各種通道經由獨立性SC之平均LCR及AFD........57
5.2 各種通道經由相關性SC之平均LCR及AFD........59
5.2.1 Rayleigh和Nakagami-m相關性分支........59
5.2.2 Weibull相關性雙分支........61
5.2.3 Rician相關性分支........63
5.3 工作於非平衡分支增益之相關Rician衰落通道........66
5.4 數值分析結果........68
第六章 結論........76
參考文獻........78
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