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Systems and methods for estimation of a population of passive RFID sensors

  • US 9,286,495 B2
  • Filed: 03/11/2014
  • Issued: 03/15/2016
  • Est. Priority Date: 03/11/2013
  • Status: Expired due to Fees
First Claim
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1. A method for estimating a population of Radio Frequency Identification (RFID) sensors in an area based upon responses during an interrogation frame processed by a processing system in a transceiver system receiving the responses comprising:

  • receiving responses from RFID sensors during a plurality of time slots of a receiving frame;

    determining a contention resolution of each of the plurality of time slots;

    determining a probability state for each of a plurality of population estimates based upon the contention resolution for each of the plurality of time slots;

    where the probability state of a population estimate is a confidence in the population estimate based upon the contention resolution observed in the plurality of time slots of a particular receiving frame;

    estimating a probability for each of the plurality of population estimates based on the probability state;

    selecting one of the plurality of population estimates as a population based upon the estimated probability of the selected one of the plurality of population estimates meeting a predetermined criteria.

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