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 TOA Estimator for UWB Backscattering RFID System with Clutter Suppression Capability | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 753129 14 pages doi 2010 753129 Research Article TOA Estimator for UWB Backscattering RFID System with Clutter Suppression Capability Chi Xu and Choi L. Law Positioning Wireless Technology Centre Nanyang Technological University 50 Nanyang Drive Research TechnoPlaza Level 4 BorderX Block Singapore 637553 Correspondence should be addressed to Chi Xu chiandlin@ Received 23 November 2009 Revised 20 April 2010 Accepted 9 May 2010 Academic Editor Richard Kozick Copyright 2010 C. Xu and C. L. Law. 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. Time of arrival TOA estimation in multipath dense environment for UWB backscattering radio frequency identification RFID system is challenging due to the presence of strong clutter. In addition the backscattering RFID system has peculiar signal transmission and modulation characteristics which are considerably different from conventional communication and localization systems. The existing TOA estimators proposed for conventional UWB systems are inappropriate for the backscattering RFID system since they lack the required clutter suppression capability and do not account for the peculiar characteristics of backscattering system. In this paper we derive a nondata-aided NDA least square LS TOA estimator for UWB backscattering RFID system. We show that the proposed estimator is inherently immune to clutter and is robust in under-sampling operation. The effects of various parameter settings on the TOA estimation accuracy are also studied via simulations. 1. Introduction Backscattering radio frequency identification RFID is a type of RFID technology employing tags that do not generate their own signals but reflect the received signals back to the
