Study on Jointing UWB Techniques with Multi-Carrier Spread Spectrum Systems 劉力榮、陳雍宗
E-mail: 9607582@mail.dyu.edu.tw
ABSTRACT
The performance analysis of UWB techniques combining with MC-SS (multi-carrier spread-spectrum) system working in multi-path fading channel is investigated in this paper. The model of the multi-path fading is characterized by Nakagami-m statistical
distribution. We establish and derive the model for MC-CDMA (multi-carrier code-division multiple-access) systems working in correlated Nakagami-m fading channel. The average BER（bit error rate）is calculated and compared to the special case of the published results. Basically、some studied results from this paper can be implied to approve the system performance for the UWB system combining with a MC-CDMA system in wireless communication systems. Especially、it is worthwhile noting that the fading parameter of the Nakagami-m distributed significantly dominates the system performance of the UWB system accompany with MC-SS signaling under fading environments. On the other hand、the fact is discovered that the effect of power decay ratio parameter will be ignored after the SNR (signal-to-noise ratio) of the transmitted bit is greater than about 50 dB.
Keywords : UWB ; Multi-carrier ; Multi-path ; Nakagami-m fading Table of Contents
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．．．．．．．．．．．．．．．．．．．．．x 表 目錄．．．．．．．．．．．．．．．．．．．．．xi 第一章 緒論 1.1 研究動機與目的．．．．．．．．．．．．．．
．1 1.2 論文內容綱要．．．．．．．．．．．．．．．．2 第二章 多載波展頻（MC-SS）系統 2.1 展頻技術．．．．．
．．．．．．．．．．．．．3 2.1.1虛擬雜訊序列．．．．．．．．．．．．．．． 4 2.1.2處理增益．．．．．．．．．
．．．．．．．． 5 2.2 CDMA系統簡介．．．．．．．．．．．．．．．．5 2.3 MC-CDMA系統介紹．．．．．．．．
．．．．．． 6 第三章 超寬頻（UWB）與MC-SS技術結合之探討 3.1 簡介．．．．．．．．．．．．．．．．．．．
．9 3.2 UWB之定義．．．．．．．．．．．．．．．．． 9 3.2.1 UWB IR系統之特性．．．．．．．．．．．．．11 3.2.2 UWB技術的應用．．．．．．．．．．．．．． 14 3.3 TH-UWB系統．．．．．．．．．．．．．．．．．15 3.3.1 脈波波形．．．．．．．．．．．．．．．．．16 3.3.2 Time-hopping PAM 調變方式．．．．．．．． 16 3.4 多重路徑 (Multi-path) ．．．．．．．．．．．18 3.5 MC-CDMA系統鋪設於UWB系統之介紹．．．．．．．18 3.6鋪設系統之系統 模式．．．．．．．．．．．．． 21 第四章 論訊號衰落通道 4.1 訊號衰落介紹．．．．．．．．．．．．．．．．28 4.2 訊號傳輸介紹．．．．．．．．．．．．．．．．29 4.2.1 反射．．．．．．．．．．．．．．．．．．．29 4.2.2 繞 射．．．．．．．．．．．．．．．．．．．29 4.2.3 散射．．．．．．．．．．．．．．．．．．．30 4.3訊號衰落通道 的分類．．．．．．．．．．．．． 30 4.3.1大尺寸衰落．．．．．．．．．．．．．．．． 31 4.3.1.1 路徑損耗．．．．
．．．．．．．．．．．．32 4.3.1.2 遮蔽效．．．．．．．．．．．．．．．．．32 4.3.2 小尺寸衰落．．．．．．．．
．．．．．．．．33 4.3.2.1 時間延遲擴散．．．．．．．．．．．．．．33 4.3.2.2 時域上的變動性．．．．．．．．．
．．．．35 4.4 多重路徑衰落簡介．．．．．．．．．．．．．．37 4.5 多重路徑衰落所造成的效應．．．．．．．．．
．38 第五章 結合超寬頻技術於多載波展頻系統之研究 5.1 系統模型．．．．．．．．．．．．．．．．．．40 5.2 系統效 能分析．．．．．．．．．．．．．．．．45 5.3 數值結果與討論．．．．．．．．．．．．．．．50 附錄 A．．．．．
．．．．．．．．．．．．．．．．55 第六章 結論．．．．．．．．．．．．．．．．．． 58 參考文獻．．．．．．．
．．．．．．．．．．．．．59 REFERENCES
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