Interference avoidance algorithms for passive RFID systems using contention-based transmit abortion

Yoshinori Tanaka, Iwao Sasase

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The performance of a passive RFID system in a dense multi-reader environment is limited by both reader-to-reader interference and reader-to-tag interference. In this paper, we formulate a practical RFID system model which takes into account the non-linear demodulation of the tags and the transmission spectrum of the readers. Using this model, we derive a novel linear programming formulation to obtain the optimum communication probability of the readers for a given reader deployment scenario. We then propose two novel distributed interference avoidance algorithms based on the detect-and-abort principle for multi-channel readers which can effectively mitigate the reader-to-tag interference as well as the reader-to-reader interference. Computer simulations show that the proposed algorithms can improve the successful communication probability and fairness among readers in dense reader environments, compared with the conventional listen-before-talk algorithm.

Original languageEnglish
Pages (from-to)3170-3180
Number of pages11
JournalIEICE Transactions on Communications
Issue number11
Publication statusPublished - 2007


  • Collision avoidance
  • RFID
  • Reader collision

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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