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Distributed Ranging Using DS-UWB and MB-OFDM Signalling for Wireless Sensor Networks
|關鍵字:||DS-UWB;直接序列超寬頻;MB-OFDM;Ranging;Wireless Sensor Networks;多頻帶正交分頻多工;距離測量;無線感測網路||出版社:||電機工程學系所||引用:||FCC, “First report and order, revision of part 15 of the commission's rules reguarding ultra-wideband transmission systems,” ET Docket, pp. 98-153, Feb. 2002. R. A. Scholtz, “Multiple access with time-hopping impulse radio,” in Proc. IEEE Military Communications (Milcom) Conf., Boston, MA, pp. 447-450, Oct. 1993. L. Yang and G. B. Giannakis, “Ultra-wideband communications: An Idea Whose Time Has Come,” IEEE Signal Processing Magazine, vol. 21, issue 6, pp. 26-54, Nov. 2004. L. De Nardis and M.-G. Di Benedetto, "Joint communication, ranging, and positioning in low data-rate UWB networks," Joint 2nd Workshop on Positioning, Navigation and Communication 2005 (WPNC''05) & 1st Ultra-Wideband Expert Talk (UET''05), Hannover, Germany, pp. 191 - 200, March 17 2005. W.C. Chung and D.S. Ha, "An accurate ultra wideband (UWB) ranging for precision asset location," Proc. 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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。
The 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.
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