Population Estimation of RFID Tags Using Hadamard Footprints

Joontae KIM  Seung-Ri JIN  Dong-Jo PARK  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.9   pp.2473-2476
Publication Date: 2010/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2473
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
tag population estimation,  RFID,  footprint,  hadamard matrix,  

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A novel method is proposed that can estimate the tag population in Radio Frequency Identification (RFID) systems by using a Hadamard code for the tag response. We formulate the maximum likelihood estimator for the tag population using the number of observed footprints. The lookup table of the estimation algorithm has low complexity. Simulation results show that the proposed estimator performs considerably better than the conventional schemes.