Cross-frequency communication: Near-field identification of UHF RFIDs with WiFi!

Zhenlin An, Qiongzheng Lin, Lei Yang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

14 Citations (Scopus)


Recent advances in Cross-Technology Communication (CTC) have improved efficient cooperation among heterogeneous wireless devices. To date, however, even the most effective CTC systems require these devices to operate in the same ISM band (e.g., 2.4GHz) because of the conventional wisdom that wireless transceivers with different (fundamental) frequencies cannot communicate with one another. Our work, which is called TiFi, challenges this belief by allowing a 2.4GHz WiFi receiver (e.g., a smartphone) to identify UHF RFID tags, which operates at the spectrum between 840 ∼ 920MHz. TiFi does not require changing current smartphones or tags. Instead, it leverages the underlying harmonic backscattering of tags to open a second channel and uses it to communicate with WiFi receivers. We design and implement TiFi with commodity WiFi chipsets (e.g., Broadcom BCM43xx, Murata KM6D280 40, and Qualcomm WCN3990). Our comprehensive evaluation shows that TiFi allows WiFi receivers to identify UHF RFID tags within the range of 2 m and with a median goodput of 95%, which is comparable to today's mobile RFID readers.

Original languageEnglish
Title of host publicationMobiCom 2018 - Proceedings of the 24th Annual International Conference on Mobile Computing and Networking
PublisherAssociation for Computing Machinery
Number of pages16
ISBN (Electronic)9781450359030
Publication statusPublished - 15 Oct 2018
Event24th Annual International Conference on Mobile Computing and Networking, MobiCom 2018 - New Delhi, India
Duration: 29 Oct 20182 Nov 2018

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM


Conference24th Annual International Conference on Mobile Computing and Networking, MobiCom 2018
CityNew Delhi


  • Cross-Frequency Communication
  • Harmonic Backscatter
  • RFID
  • TiFi
  • WiFi

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Software

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