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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/9E1CBBE8-F3BB-4519-BAF2-F79F0E2D5545 | ||
| Year | 2021 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
| License |
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| Bibliographic Citation | K. Skyvalakis and A. Bletsas, "Asynchronous reception of 2 RFID tags," IEEE Trans. Commun., vol. 69, no. 8, pp. 5243-5254, Aug. 2021, doi: 10.1109/TCOMM.2021.3077942. https://doi.org/10.1109/TCOMM.2021.3077942 | ||
| Appears in Collections |
Commercial radio frequency identification (RFID) readers have to resolve collisions between tags, without sacrificing throughput. This work proposes a Viterbi joint sequence detector as well as a 2-symbol joint tag information detector that can resolve a collision between two tags in the physical layer. In sharp contrast to prior art, the proposed closed-form signal model takes into account the asynchrony level between the two collided tag responses, which is not uncommon with commercial, low-cost RFID tags that follow industry’s Gen2 protocol. The asynchrony is considered as the time offset τ between the beginnings of the two tags’ responses and is modeled through a derived shaping matrix that depends on the delayed tag information. Performance evaluation of the proposed detectors with simulated data under Ricean fading, as well as experimental data with software-defined radio, reveals improved performance compared to prior art, under various operating regimes. It is also shown that for different values of the parameter τ , BER does not present a monotonic behaviour. As a collateral dividend, it is found that clustering techniques on the filtered received signal should explicitly take into account the time offset τ , since the latter modifies the number of observed clusters.
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