TY - GEN
T1 - UHF-RFID Backscatter Channel Analysis for Accurate Wideband Ranging
AU - Grebien, Stefan Josef
AU - Kulmer, J.
AU - Goller, M.
AU - Galler, F.
AU - Arthaber, H.
AU - Witrisal, K.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Positioning and ranging within UHF RFID are highly dependent on the channel characteristics. The accuracy of time-of-flight based ranging systems is fundamentally limited by the available bandwidth. This paper first analyzes the UHF RFID backscatter channel formed by convolution of the individual constituent channels. For this purpose, we present comprehensive wideband channel measurements in two representative scenarios and an analysis with respect to the Rician K-factor for the line-of-sight component, the root-mean-square delay spread, and the coherence distance, which all influence the potential positioning performance. Based on these measurements, we validate the Cramér Rao lower bound for time-of-flight based ranging under the influence of dense multipath and present two types of range estimators, a maximum likelihood and a matched filter approach. The resulting range estimates highlight the need for an increased bandwidth for UHF RFID systems with respect to time-of-flight based ranging.
AB - Positioning and ranging within UHF RFID are highly dependent on the channel characteristics. The accuracy of time-of-flight based ranging systems is fundamentally limited by the available bandwidth. This paper first analyzes the UHF RFID backscatter channel formed by convolution of the individual constituent channels. For this purpose, we present comprehensive wideband channel measurements in two representative scenarios and an analysis with respect to the Rician K-factor for the line-of-sight component, the root-mean-square delay spread, and the coherence distance, which all influence the potential positioning performance. Based on these measurements, we validate the Cramér Rao lower bound for time-of-flight based ranging under the influence of dense multipath and present two types of range estimators, a maximum likelihood and a matched filter approach. The resulting range estimates highlight the need for an increased bandwidth for UHF RFID systems with respect to time-of-flight based ranging.
KW - matched filters
KW - maximum likelihood estimation
KW - radiofrequency identification
KW - Rician K-factor
KW - UHF-RFID backscatter channel analysis
KW - coherence distance
KW - comprehensive wideband channel measurements
KW - line-of-sight component
KW - matched filter approach
KW - root-mean-square delay spread
KW - time-of-flight based ranging
KW - wideband ranging
KW - Antenna measurements
KW - Distance measurement
KW - Maximum likelihood estimation
KW - Radiofrequency identification
KW - Signal to noise ratio
KW - Wideband
U2 - 10.1109/RFID.2017.7945596
DO - 10.1109/RFID.2017.7945596
M3 - Conference paper
SP - 117
EP - 123
BT - 2017 IEEE International Conference on RFID, RFID 2017
PB - Institute of Electrical and Electronics Engineers
ER -