Title :
A hybrid algorithm for range estimation in RFID systems
Author :
Thangarajah, K. ; Rashizadeh, R. ; Erfani, Shervin ; Ahmadi, Mahdi
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Windsor, Windsor, ON, Canada
Abstract :
The deployment of RFID technology will gain a significant boost if indoor location positioning is incorporated into RFID systems. Recent development in range estimation indicates that phase difference of arrival (PDOA) shows a promising performance. PDOA technique suffers from an inherited limitation of phase difference which is restricted to the maximum of 2p radians. In this paper a robust algorithm to overcome this limitation and unwrap the phase is presented. A theoretical model has been developed to accurately unwrap the phase using the round trip time of flight. Simulation results show that the proposed method can be used to estimate the range even under significant Round Trip Time of Flight (RTTF) measurement error. It is shown that a wide range of time measurement errors can converge to actual distance if the frequency difference of the transmitted waves is properly selected.
Keywords :
indoor communication; measurement errors; radiofrequency identification; 2p radians; PDOA technique; RFID systems; RTTF measurement error; frequency difference; hybrid algorithm; indoor location positioning; phase difference of arrival technique; range estimation; robust algorithm; round trip time of flight measurement error; time measurement errors; transmitted waves; Accuracy; Estimation; Frequency estimation; Radiofrequency identification; Simulation; Time frequency analysis; Time measurement; Floor operation; Phase difference of arrival; Radio frequency identification; Round trip time of flight;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4673-1261-5
Electronic_ISBN :
978-1-4673-1259-2
DOI :
10.1109/ICECS.2012.6463511
