tailieunhanh - Báo cáo hóa học: " Research Article A Comprehensive Evaluation of Indoor Ranging Using Ultra-Wideband Technology"

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: Research Article A Comprehensive Evaluation of Indoor Ranging Using Ultra-Wideband Technology | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 86031 10 pages doi 2007 86031 Research Article A Comprehensive Evaluation of Indoor Ranging Using Ultra-Wideband Technology Camillo Gentile and Alfred Kik Wireless Communication Technologies Group National Institute of Standards and Technology Gaithersburg MD 20899-1070 USA Received 1 May 2006 Revised 3 October 2006 Accepted 15 February 2007 Recommended by Arumugam Nallanathan Ultra-wideband technology shows promise for precision ranging due to its fine time resolution to resolve multipath fading and the presence of lower frequencies in the baseband to penetrate walls. While a concerted effort has been conducted in the extensive modeling of the indoor UWB channel in recent years to our knowledge only two papers have reported ranging performance but for limited range and fixed bandwidth and center frequency. In principle boosting power can guarantee connectivity between transmitter and receiver but not precision due to the distorting effects of walls and other objects in the direct path. In order to gauge the limits of UWB ranging we carry out 5000 measurements up to an unprecedented 45 m in non-line-of-sight conditions in four separate buildings with dominant wall material varying from sheet rock to steel. In addition we report performance for varying bandwidth and center frequency of the system. Copyright 2007 C. Gentile and A. Kik. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Ultra-wideband UWB signals are characterized by a bandwidth greater than 500 MHz or one exceeding 20 of the center frequency of radiation 1 2 . Such technology shows promise for indoor ranging due to its fine time resolution to resolve multipath fading and the presence of lower frequencies in .