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研究生： 簡永鎧
Jian, Yong-Kai
論文名稱： 超寬頻訊號之快速擷取方法
A Rapid Acquisition Scheme for UWB Signals
指導教授： 蘇賜麟
Su, Szu-Lin
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2004
畢業學年度： 92
語文別： 英文
論文頁數： 50
中文關鍵詞： 同步 、超寬頻 、訊號設計
外文關鍵詞： acquisition, pulse shape, UWB
相關次數： 點閱：62  下載：2 
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    • 　　近幾年來，由於美國聯邦通訊委員會(FCC)發表的02-48號法規，規範超寬頻無線通訊系統(UWB)可操作於未經核准的頻帶上，使其相當受到市場的矚目。UWB最吸引人的特性在於占用了非常大的頻寬以及能與現存的通訊系統相容。
    　　在本論文中，我們修改了一些訊號設計的方法，不但可以符合FCC的頻帶限制，而且還有正交以及更有彈性的滿足使用者要求的性質。另一方面，我們提出了幾個使用匹配濾波器的設計，來針對UWB訊號作初始的同步，並將其在白色高斯雜訊(AWGN)下分析的結果利用模擬加以驗證，更進一步的在UWB多路徑通道環境下行模擬。

    　　UWB has recently gained a great deal of interest due to the recent Federal Communications Commission (FCC) Report and Order 02-48 which allocates the UWB band 7.5GHz of unlicensed for indoor and outdoor communication applications. Attractive features of the UWB communication systems are the occupation of an extremely large bandwidth and the coexistence with narrowband and wideband systems already operating in dedicated frequency bands.
    　　In this thesis, we modify some pulse design algorithms which are not only satisfied with FCC frequency mask, but also orthogonal and flexible for our requirements. On the other hand, we provide several acquisition methods using matched filter technique for the impulse radio systems. We analyze the mean acquisition time of these schemes on AWGN channel and the analytic results are verified by simulation, and furthermore utilize these schemes under UWB multipath channels.

    Abstract i Contents ii List of Tables iv List of Figures v 1 Introduction 1 1.1 Overview of Ultra-Wideband Communications 1 1.2 Outline 3 2 UWB Pulse Shapers 4 2.1 Definition of UWB 4 2.2 Pulse Design Using Hankel Matrix 6 2.2.1 Pulse Design Algorithm 6 2.2.2 Results of Pulse Design 8 2.3 Novel Modified Hermite Pulses 10 2.3.1 Pulse Design Based on Modified Hermite Polynomials 10 2.3.2 Flexibility for Modified Hermite Pulses 13 2.4 Comparison and Discussion 15 3 UWB Pulse Acquisition Schemes 17 3.1 Acquisition Schemes 17 3.1.1 Threshold Comparison Method 19 3.1.2 Threshold Comparison with Memory Method 20 3.1.3 Maximum Selection Method 21 3.2 Mean Acquisition Time Analyses 21 3.2.1 Threshold Comparison Method 23 3.2.2 Maximum Selection Method 28 4 Simulation under UWB Channel Models 32 4.1 UWB Multipath Channel Models 32 4.1.1 Multipath Model 32 4.1.2 Channel Characteristics Desired to Model 35 4.1.3 Channel Realizations 37 4.2 Simulation on AWGN Channel 39 4.2.1 The Optimum Sampling Rate 39 4.2.2 The Mean Acquisition Time to SNR 41 4.3 Simulation under UWB Channel Models 43 4.3.1 CM1 43 4.3.2 CM2 45 5 Conclusions 47 Bibliography 49

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