Wireless Location in CDMA Cellular Radio Systems
Wireless Location in CDMA Cellular Radio Systems
RFID: A Technical Overview and Its Application to the Enterprise
IT Professional
An Introduction to RFID Technology
IEEE Pervasive Computing
IEEE Transactions on Wireless Communications
A New Time of Arrival Estimation Method Using UWB Dual Pulse Signals
IEEE Transactions on Wireless Communications
Ranging in a dense multipath environment using an UWB radio link
IEEE Journal on Selected Areas in Communications
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To realize precise localization for UWB backscattering RFID system, the arrival time of the direct path in the received signal (referred as time of arrival (TOA)) needs to be accurately estimated. The background clutter is one of the major factors that deteriorates the TOA estimation accuracy in backscattering RFID system. To suppress the background clutter while maintain low-complexity system design, we propose a novel UWB backscattering RFID system with its tag being implemented with dual pulse (DP) modulation. By transforming the mathematical model of received signal into a proper form, we discover the tag's sequence selection criteria which are able to mitigate the background clutter. For the proposed tag coded with dedicated sequences, a two-stage TOA estimation algorithm able to effectively mitigate clutter is developed. Simulation results show that the proposed RFID system coupled with the algorithm is able to achieve accurate TOA estimation in the environment where the clutter overwhelms the tag response. Copyright © 2010 John Wiley & Sons, Ltd.