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研究生:陳穎釧
研究生(外文):Chen ying chuan
論文名稱:非等增益分支經由選擇性合成(SC)於相關性Weibull通道中之研究
論文名稱(外文):The SC Diversity with Un-equal Gain Branches in Correlated-Weibull Fading
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:2007
畢業學年度:95
語文別:中文
論文頁數:57
中文關鍵詞:平均準位跨越率(LCR)平均衰落區間(AFD)選擇性合成SC(selection combining)等增益分支(equal gain)非等增益分支(un-equal gain)
外文關鍵詞:average LCR (level crossing rate)AFD (average fade duration)SC (selection combining) diversityequal gain branchun-equal gain branch
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在本文中我們將研究在雙分支的選擇性合成(selection combining﹐SC)接收器下的平均準位跨越率 (level crossing rate﹐LCR))和平均衰落區間 (average fade duration﹐AFD)兩者與正常化封波準位之間的系統效能.並且討論假設在多樣路徑下等增益分支(equal gain) 和非等增益分支(un-equal gain)兩者的系統效能分析及考慮在相關性Weibull 通道衰落環境下的特性描述。經過本篇論文研究後,我們提出新的方程式及數字結果來驗證其分析的準確性,並且透過Weibull 分布的各種不同衰落參數(fading parameter)來進行彼此的數值分析。此外,更讓我們依據研究出來的數據圖形結果,明顯的看出選擇性分集的系統效能會受到非增益分支的影響,更藉此說明選擇性分集在無線通訊系統中的分析和設計時各種環境中參數考量的重要性。
The system performance of average LCR (level crossing rate) and AFD (average fade duration) versus normalized envelope level for a dual-branch SC (selection combining) receiver are discussed in this paper. Both of the equal and un-equal gain branches of the diversity paths are assumed in the evaluation of system performance, and the scenario of the suffered fading channel is considered characterized as correlated-Weibull fading environments. We derived the new formulas and the numerical results are conduct for the purpose of accuracy validation. The different fading parameter of the Weibull distributed are compared each other in the numerical evaluation section. Besides, from the illustrated results it is worthwhile noting that the un-equal path gain, which is definitely affect the system performance of the SC diversity, should be taken into account for the analyzing or designing of the SC diversity system in wireless communication systems.
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..........................vii
圖目錄.........................xi
表目錄.........................xii

第一章 緒論
1.1 研究動機及目的.................1
1.2 論文摘要及簡介.................2
第二章 LCR、AFD分析和Equal-gain與Un-equal gain之探討
2.1平均準位跨越率(LCR)與平均衰落區間介紹..... 5
2.1.1平均LCR與AFD之物理意義........ 6
2.2 LCR與AFD 系統模型分析與定義........ 7
2.3等增益(equal gain)與非等增益(un-equal gain)分支的討論與分析................... 8
第三章 通訊衰落環境數學模式分析
3.1無線電波的傳輸現象............... 10
3.1.1 繞射................... 11
3.1.2 反射...................11
3.1.2 散射...................12
3.2衰落通道的種類................ 12
3.2.1大尺寸衰落介紹 ............ .13
3.2.1.1遮蔽效應與對數-常態分布(log-normal distribution) ............13
3.2.1.2 路徑損耗 .............14
3.2.2 小尺寸衰落介紹.............. 16
3.2.2.1 延遲擴展(delay spread)...... 17
3.2.2.2 都卜勒效應............21
3.3常用通信波道統計分布的介紹.......... 23
3.3.1 瑞雷分布(Rayleigh distribution)... 23
3.3.2 萊斯分布(Ricean distribution) .... 27
3.3.3 Nakagami-m衰落分佈.........29
3.3.4 Weibull 衰落分佈...........31
第四章 分集合成技術及等增益與非等增益經由雙分支SC於Weibull 通道分析
4.1分集合成技術................. 34
4.1.1空間分集................. 34
4.1.1.1 選擇性合成(selective combining, SC) .35
4.1.1.2 等增益合成(equal gain combining EGC) .............. 36
4.1.1.3最大比例合成(maximal ratio combining, MRC).............. 37
4.2. 等增益與非等增益經由雙分支SC分集合成於相關性Weibull通道中的平均LCR及AFD模型分析...................... 40
4.2.1 等增益經由雙分支SC分集合成於相關性Weibull通道中的平均LCR及AFD模型分析..... 40
4.2.2 非等增益經由雙分支SC分集合成於相關性Weibull通道中的平均LCR及AFD模型分析.. 43
第五章 數值分析.................... 45
第六章 結論...................... 52
參考文獻........................ 53
符號說明........................ 56
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[12] Joy I. Z. Chen, Evaluation for Average LCR and AFD of Dual MRC and SC Diversity over Correlated Nakagami-m Environments, Journal of Marine Science and Technology, Submission for publication, 2006.
[13] Joy I. Z. Chen, and Y. T. Huang, The Average LCR and AFD Performance Analysis of SC over Correlated Weibull Fading Environments, ICSS 2005 International Conference on System & Signals, Kao-Hsiung, Taiwan, R.O.C., pp. 114-119, 2005.
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