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Interference Avoidance Algorithms for Passive RFID Systems Using Contention-Based Transmit Abortion
Yoshinori TANAKA Iwao SASASE
Publication
IEICE TRANSACTIONS on Communications
Vol.E90-B
No.11
pp.3170-3180 Publication Date: 2007/11/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3170 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: RFID, reader collision, collision avoidance,
Full Text: PDF>>
Summary:
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.
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