Study on the Performance of NC-MFSK with Selective Combining Diversity over Weibull Fading Environments
洪春田、陳雍宗
E-mail: 9419617@mail.dyu.edu.tw
ABSTRACT
The methods applied to improve the receiver of wireless communication system with digital modulation combines and diversity combining manners are investigated in this thesis. The channel fading phenomena exist in the modulation schemes are also considered in this study. There are some of the famous and most assumption channel model introduced in my study. The main reason for adopting the Weibull distribution in my study is it has the shape parameter can be applied to characterize the channel fading. On the other hands, the performance of average LCR (level crossing rates) and AFD (average fading durations) for the simplest combining diversity, SC (selection combining), are also evaluated in here. In fact, in this paper some of the formulas of BER (bit error rate) performance are proposed for the SC diversity with noncoherent MFSK (M-ary frequency shift keying) and DQPSK (difference quaternary phase shift keying) over Weibull fading environments.
Keywords : Weibull fading channel、LCR (level crossing rates)、AFD (average fading duration)、NC-MFSK、DQPSK Table of Contents
封面內頁 簽名頁 授權書．．．．．．．．．．．．．．．．．．．．．．．．．iii 中文摘要．．．．．．．．．．．．
．．．．．．．．．．．．v 英文摘要．．．．．．．．．．．．．．．．．．．．．．．．vi 誌謝．．．．．．．．．
．．．．．．．．．．．．．．．．．vii 目錄．．．．．．．．．．．．．．．．．．．．．．．．．．viii 圖目錄．．
．．．．．．．．．．．．．．．．．．．．．．．xi 表目錄．．．．．．．．．．．．．．．．．．．．．．．．．xiii 符號說明．．．．．．．．．．．．．．．．．．．．．．．．xiv 第一章 緒論 1.1 研究背景．．．．．．．．．．．．
．．．． 01 1.2 研究動機．．．．．．．．．．．．．．．． 08 1.3 論文架構．．．．．．．．．．．．．．．． 09 第 二章 通道特性 2.1 通道雜訊源．．．．．．．．．．．．．．． 10 2.1.1大氣雜訊 ．．．．．．．．．．．．．．． 11 2.1.2人造雜訊．．．．．．．．．．．．．．．．11 2.1.2.1引起射頻干擾的原因．．．．．．．．．．12 2.1.3太空雜訊．
．．．．．．．．．．．．．．．14 2.2 傳輸通道之衰落成因．．．．．．．．．．． 14 2.2.1反射(Reflection) ．．．．．
．．．．．．16 2.2.2繞射(Diffraction) ．．．．．．．．．．．16 2.2.3散射(Scattering) ．．．．．．．．．．．16 2.2.4多 重路徑之影響．．．．．．．．．．．．．．17 2.3 衰落通道之分類．．．．．．．．．．．．．．17 2.3.1小尺寸衰落．
．．．．．．．．．．．．．．．18 2.3.2大尺寸衰落．．．．．．．．．．．．．．．．18 2.3.3頻率選擇性衰落．．．
．．．．．．．．．．．19 2.3.4頻率非選擇性衰落．．．．．．．．．．．．．19 2.3.5緩慢衰落．．．．．．．．．．
．．．．．．．20 2.3.6快速衰落．．．．．．．．．．．．．．．．．20 2.4 通道衰落之克服 ．．．．．．．．．．．．
． ．21 第三章 通道模型 3.1 Rayleigh分布模型．．．．．．．．．．．．．23 3.2 Rice分布模型．．．．．．．．．．．
．．．．24 3.3 Nakagami分布模型．．．．．．．．．．．．．26 3.4 Weibull分布模型．．．．．．．．．．．．．．28 3.5 採用Weibull的原因．．．．．．．．．．．．．30 第四章 分集合成技術 4.1分集合成特性．．．．．．．．．．．．
．．．．．32 4.1.1分集(Diversity)的意義．．．．．．．．．．32 4.1.2合成(Combining)的意義．．．．．．．．．．33 4.2 最大比率合成接收機．．．．．．．．．．．．．33 4.3 選擇合成接收機．．．．．．．．．．．．．．．36 4.4 等增益 合成接收機．．．．．．．．．．．．．．37 4.5 採用選擇合成的原因．．．．．．．．．．．．．39 第五章 調變方式 5.1 數位調變方式．．．．．．．．．．．．．．．．44 5.2 同調與非同調系統．．．．．．．．．．．．．．45 5.3 NC-MFSK調變．．．．．．．．．．．．．．．．46 5.4 DQPSK調變．．．．．．．．．．．．．．．．．48 第六章 位移鍵控調變系統在韋布通道中之效能分析 6.1 系統架構．．．．．．．．．．．．．．．． 50 6.2 NC-MFSK系統．．
．．．．．．．．．．．．．50 6.3 DQPSK系統．．．．．．．．．．．．．．．．54 6.4 數值分析結果 ．．．．．．．
．．．．．．． 58 第七章 結論．．．．．．．．．．．．．．．．．．．．．．60 參考文獻．．．．．．．．．．．．
．．．．．．．．．．．．61 REFERENCES
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