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研究生:陳耀華
研究生(外文):Yao-Hua Chen
論文名稱:無線衰落信道中新的切換式和/或選擇式多支分集接收
論文名稱(外文):New Switch and/or Selection Diversity for Wireless Fading Channels
指導教授:趙燿庚趙燿庚引用關係
學位類別:博士
校院名稱:元智大學
系所名稱:通訊工程學系
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:2011
畢業學年度:99
語文別:英文
論文頁數:82
中文關鍵詞:選擇性合成切換式合成瑞利衰減通道中山衰落通道
外文關鍵詞:selection diversityswitch diversityRayleig fading channelsNakagami-m fading channels
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本論文針對選擇性合成(selection combining, SC) 與切換式合成(switch combining, SWC)提出一種新的架構並對所提出之架構進行效能分析。對於選擇性合成而言,為了降低最佳式選擇性合成(optimal SC, |αr|−SC)在硬體實現上之複雜度,本論文提出了一種利用正規化衰減因子(normalized fading factor)和訊號偵測變數之大小的和來做天線之選擇依據之選擇性合成((α+|r|)−SC)。其中
α是指通道之衰減因子(fading factor)而r 是天線接收之訊號。所提出之(α+|r|)選擇性合成在電路實現上比最佳式選擇性分集與最大比率合成來擁有較小之面積與較低之功率消耗。所提出之(α+|r|)選擇性合成在性能上與最佳式選擇性合成相似,但優於傳統上之訊雜比(signal to noiseratio, SNR)選擇性合成。
本論文亦將所新提出之(α +|r|)與文獻上現有之|r|與|αr|等三種不同之統計變數(statistics variable)作為多分隻切換停留合成(multibranch switch-and-stay combining, MSSC)與切換檢查合成(switch-and-examine combining, SEC)之切換依據並分析其在統計獨立之瑞利衰減通道上的性能。另外本論文亦提出一種結合選擇性合成與切換停留合成之新的合成技術。該技術用於雙分支之情況下,此技術為選擇切換合成(selection and stay combining, SSTC)。本論文針對選擇切換合成在統計獨立與相關之中山(Nakagami)衰落通道進行分析。

In this thesis, three diversity schemes are proposed and analyzed. First, a new selection combining (SC) scheme is proposed. Compared to the optimal SC and maximal ratio combining (MRC), the new proposed SC scheme only uses adders for diversity combining and is much more power-saving and faster. The performance of the proposed SC scheme is similar to that of the optimal SC and considerably outperforms the traditional signal-to-noise-ratio (SNR) based SC. Second, three multibranch switch-and-stay combining (MSSC) diversity schemes with different statistics of switch decision are analyzed for independent Rayleigh fading channels. Third, by combining the SC and SSC, another new dual-branch selection-and-stay combining (SSTC) is considered and analyzed for diversity reception on independent and correlated Nakagami-m fading channels, where the conventional SC is employed only at the switching instance, and the receiver uses the selected branch till its SNR is lower than a preset threshold.
For all proposed SC- and/or SWC-based diversity combining schemes, theoretical performance evaluations are given, and numerical results from analysis and Monte-Carlo simulation are presented.

Chinese Abstract ······································i
English Abstract ······································ii
Acknowledgement········································iii
Table of Contents ·····································iv
List of Figures ·······································vii
1 Introduction ········································1
1.1 Maximum Ratio Combining····························1
1.2 Equal Gain Combining·······························2
1.3 Selection Combining ·······························2
1.4 Switched Combining ································4
1.5 Motivations········································5
1.6 Organization of the thesis ························8
2 A New Selection Combining Scheme by Selecting the Largest Sum of Normalized Fading Factor and Decision-Variable Magnitude·····································11
2.1 Received Signals and Diversity Model···············11
2.2 Performance Analysis·······························12
2.2.1 BER of the (α +|r|)-SC for i.n.d. Fading Channels···························································12
2.2.2 BER of the (α +|r|)-SC for i.i.d Fading Channels····························································14
2.2.3 BER of the |r |-SC for Independent Fading Channels ·························································16
2.3 Numerical and Simulation Results ··················17
2.4 Conclusions ·······································19
Appendix 2A ···········································21
Appendix 2B ···········································22
Appendix 2C ···········································24
Appendix 2D ···········································26
3 General Multibranch Switch-and-Stay Combing with Different New Switch Statistics on Rayleigh Fading Channels·······················································29
3.1 Modeling the General MSSC ·························29
3.2 Performance Analysis·······························31
3.2.1 General BER Form·································31
3.2.2 |αr|-MSSC ·······································32 3.2.3 (α +|r|)-MSSC····································34
3.2.4 |r|-MSSC·········································36
3.3 Performance Optimization···························38
3.3.1 |α r|-MSSC ······································38
3.3.2 (α +|r|)-MSSC····································39
3.3.3 |r|-MSSC·········································39
3.4 Numerical Results ·································40
3.5 Conclusions ·······································42
Appendix 3A ···········································44
Appendix 3B ···········································46
4 Switch-and-Examine Diversity Combining Based on Various Switch Statistics for Wireless Fading Channels ········47
4.1 MSEC System Model ·································47
4.2 Performance Evaluation ····························49
4.2.1 |α r|-MSEC·······································49
4.2.2 |r|-MSEC ········································50
4.2.3 (α +|r|)-MSEC····································50
4.3 Numerical Results ·································51
4.4 Conclusions ·······································54
5 Switching Rate and Receiver Performance of Binary Modulations with the Selection-and-Stay Combining over Independent and Correlated Nakagami-m Fading Channels··55
5.1 Characters of SSTC·································55
5.1.1 Fading Channel Model ····························55
5.1.2 Switching Model ·································56
5.1.3 MGF of γsstc····································57
5.1.4 Switching Rate ··································59
5.2 Performance Evaluation ····························59
5.2.1 Independent Fading Channels······················60
5.2.2 Correlated Fading Channels ······················62
5.3 Numerical Results ·································64
5.4 Conclusions ·······································69
Appendix 5A ···········································70
Appendix 5B ···········································71
Appendix 5C ···········································73
Appendix 5D ···········································75
Conclusions ···········································77
Reference ·············································79



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