本論文裡，我們提出了一個應用在直接序列超寬頻(Direct Sequence Ultra Wide-Band)系統的傳送架構，此傳送架構主要目的是為了對抗符元間干擾(Inter-Symbol Interference)。在直接序列超寬頻系統中，為了達到更高的傳送速率，縮短保護區間(Guard Interval)是可行的方式之ㄧ，但是縮短保護區間將會面臨更高更多的干擾，因此便需要一套有效的機制，來解決保護區間縮短以及通道延遲擴展過長所造成的干擾。本論文所提出的架構，應用了完美序列(Perfect Sequence)所具有良好的週期性自相關特性，可以有效的消除符元間干擾。

In this thesis, a novel transmission structure is proposed for the Direct Sequence Ultra Wide-Band (DS-UWB) systems. The main purpose of the proposed structure is to eliminate the inter-symbol interference caused by the multi-path environment. In DS-UWB systems, shortening the guard interval is one of the possible ways to achieve higher data rates. However, interference will increase inversely with the length of the guard interval because the signal delay spread caused by the multi-path effect will induce inter-symbol interference. In this thesis, a novel transmission structure that utilizes the autocorrelation properties of the perfect sequence is proposed for interference cancellation in DS-UWB systems. Both computer simulation and mathematical analysis are provided for performance evaluation.

致謝 I
中文摘要 II
ABSTRACT III
目錄 IV
圖目錄 VI
中英對照表 VIIII
第一章 導論 1
1.1無線短距傳輸技術之種類及比較 1
1.2 研究動機 2
1.3 論文章節介紹 3
第二章 超寬頻系統簡介 4
2.1 脈衝無線電系統介紹 4
2.2直接序列展頻概論 13
2.3直接序列超寬頻系統 14
2.4直接序列二元相位鍵移 15
2.5 DS-UWB和MB-OFDM系統的比較 16
第三章 通道模型介紹 18
3.1一般無線通訊系統通道模型 18
3.2室內UWB無線傳輸通道模型 24
第四章 新的架構介紹與分析 29
4.1系統架構 29
4.2完美序列概要 34
4.3 數學分析 36
第五章 電腦模擬 38
5.1單一用戶的比較模擬圖 41
5.2 多用戶的比較模擬圖 46
第六章 結論 51
附錄A 52
附錄B 53
參考文獻 61

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