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dc.contributor.authorChen, Jun-Kohen_US
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dc.description.abstract本篇論文的主旨是探討直接序列超寬頻(Direct Sequence Ultra-WideBand,DS-UWB) 與多頻帶正交分頻多工 (Multi-Band Orthogonal Frequency Division Multiplexing,MB-OFDM) 這兩種技術的信號格式在不同估測環境下的測距精確度(ranging accuracy)。由於超寬頻 (Ultra-WideBand,UWB) 信號具有良好的時間解析能力,因此我們使用以時間為測量基礎的測距系統,並測量信號的傳播時間 (propagation time) 來估測無線感測網路 (wireless sensor networks) 中兩個節點之間的距離。 在論文中討論的重點主要分為兩個部份:(1) 當兩個節點之間的時間同步時,我們經由兩種不同的觀點來分析DS-UWB和MB-OFDM的測距精確度;(2) 當兩個節點之間的時間不同步時,我們藉由非同步時鐘之距離估測 (Distance Estimation via Asynchronous Clocks,DEVAC) 演算法來達成兩個節點之間的同步與測距。由分析結果可知,在UWB的五種信號格式下,DS-UWB High Band的信號格式因為使用較高的頻帶及較寬的運作頻寬,故在不同的估測環境下均可得到較佳的測距精確度。zh_TW
dc.description.abstractThe main purpose of this thesis is to study ranging accuracy using Direct Sequence Ultra-WideBand (DS-UWB) and Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) signalling under different estimation environments. Because of good timing resolution in Ultra-WideBand (UWB) systems, time-based schemes are chosen for ranging in wireless sensor networks. Based on the measurement of signal propagation time, the distance between two sensors can be estimated. This thesis discusses the following two major parts: (1) The ranging accuracy using DS-UWB and MB-OFDM signalling with time synchronization; (2) The ranging accuracy using the Distance Estimation via Asynchronous Clocks (DEVAC) algorithm without time synchronization. Numerical results show that DS-UWB High Band has better ranging accuracy in different estimation environments, due to its higher operation frequency and larger bandwidth.en_US
dc.description.tableofcontents誌謝辭i 摘要ii Abstractiii 目次iv 表目次vi 圖目次vii 第一章 緒論1 1.1 前言1 1.2 研究動機4 1.3 文獻回顧4 1.4 論文架構5 第二章 超寬頻系統與測距6 2.1 DS-UWB介紹6 2.1.1 DS-UWB系統規格6 2.1.2 DS-UWB的同步10 2.2 MB-OFDM介紹10 2.2.1 MB-OFDM系統規格12 2.2.2 MB-OFDM的同步14 2.3 DS-UWB和MB-OFDM的比較14 2.4 測距技術15 2.4.1 抵達時間 (TOA)15 2.4.2 抵達時間差 (TDOA)15 2.4.3 接收信號強度指標 (RSSI)16 2.4.4 抵達角度 (AOA)16 2.4.5 測距技術比較16 第三章 在同步情況下評估測距精確度18 3.1 傳播時間估測誤差之CRLB18 3.2 在AWGN通道下比較測距精確度23 3.3 在室內多重路徑通道下比較測距精度27 3.3.1 室內多重路徑通道29 3.3.2 通道A和AWGN通道比較34 3.3.3 通道F和AWGN通道比較40 3.3.4 6種通道和AWGN通道比較47 第四章 在非同步情況下評估測距精確度53 4.1 在AWGN通道下達成同步及測距53 4.1.1 DEVAC53 4.1.2 在AWGN通道下的時間校正分析55 4.1.3 傳播距離估測57 4.1.4 在AWGN通道下測距精確度之比較58 4.2 在室內多重路徑通道下達成同步及測距64 4.2.1 通道估測65 4.2.2 在室內多重路徑通道下的時間校正分析68 4.2.3 在室內多重路徑通道下測距精確度之比較70 第五章 結論76 參考文獻77zh_TW
dc.subjectWireless Sensor Networksen_US
dc.titleDistributed Ranging Using DS-UWB and MB-OFDM Signalling for Wireless Sensor Networksen_US
dc.typeThesis and Dissertationzh_TW
item.openairetypeThesis and Dissertation-
item.fulltextno fulltext-
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