Performance of a Beamforming based RFID System for Velocity Estimation

속도 추정용 빔포밍 기반 RFID 시스템 성능 분석

Jeon, Seong-ha;Jeon, Hyeon-mu;Yang, Hoon-gee

  • Received : 2015.05.06
  • Accepted : 2015.06.15
  • Published : 2015.08.31


RFID based applications that combine radar techniques to obtain the location and the ID of a tag have widely been investigated. In this paper, we analyze a recently proposed RFID system that can extract the tag IDs and their velocities using signals transmitted from the tag attached moving objects and verify its performance. In the proposed system, a beacon transmits triggering signal at regular intervals into a monitoring area and the tag receiving the triggering signal backscatters the FMCW(frequency modulation continuous wave) signal modulated by the tag ID. The reader system demodulates this FMCW signal using predefined two reference signals to obtain not only the tag ID but its velocity. In this paper, we show that the proposed system works properly and analyze the degree of performance degradation in cases when the synchronization error between the transmitting signal and the reference signal occurs, and even when sampling rate is lowered for implementation purpose. Finally, the analytical results are verified by simulation.




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