tailieunhanh - Báo cáo hóa học: " Time of Arrival Estimation for UWB Localizers in Realistic Environments"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Time of Arrival Estimation for UWB Localizers in Realistic Environments | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 32082 Pages 1-13 DOI ASP 2006 32082 Time of Arrival Estimation for UWB Localizers in Realistic Environments Chiara Falsi 1 Davide Dardari 2 Lorenzo Mucchi 3 and Moe Z. Win4 1 Dipartimento di Elettronica e Telecomunicazioni Università degli studi di Firenze Via Santa Marta 3 50139 Firenze Italy 2 The WiLAB IEIIT CNR CNIT Universita di Bologna Via Venezia 52 47023 Cesena Italy 3 Dipartimento di Elettronica e Telecomunicazioni CNIT Universita degli studi di Firenze Via Santa Marta 3 50139 Firenze Italy 4 Laboratory for Information and Decision Systems LIDS Massachusetts Institute of Technology Room 32-D658 77 Massachusetts Avenue Cambridge MA 02139 USA Received 14 June 2005 Revised 12 December 2005 Accepted 30 April 2006 This paper investigates time of arrival ToA estimation methods for ultra-wide bandwidth UWB propagation signals. Different algorithms are implemented in order to detect the direct path in a dense multipath environment. Different suboptimal low-complex techniques based on peak detection are used to deal with partial overlap of signal paths. A comparison in terms of ranging accuracy complexity and parameters sensitivity to propagation conditions is carried out also considering a conventional technique based on threshold detection. In particular the algorithms are tested on experimental data collected from a measurement campaign performed in a typical office building. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION There has been great interest in ultra-wide bandwidth technology in recent years because of its potential for a large number of applications. A large body of literature exists on the characterization of indoor propagation channels and many indoor propagation measurements have been made 1-7 . Due to its fine delay resolution properties UWB shows good capability for short-range communications in dense .