Perfectly synchronized streaming from digitally modulated multiple backscatter sensor tags

Jin Mitsugi, Yuusuke Kawakita, Kiyoshi Egawa, Haruhisa Ichikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper proposes a multiple access method, referred to as Multiple Subcarrier Multiple Access (MSMA), for perfectly synchronized concurrent data collection from a group of passive backscatter wireless sensor tags and its experimental evaluation. By achieving less than 128 micro second synchronization error, backscatter communications can be applied to structural health monitoring of artifacts such as civil structures and machineries. In MSMA, each sensor tag uses a dedicated subcarrier frequency to produce a modulated backscatter. The sensor data is superposed onto the subcarrier either with an analog or a digital modulation. The inevitable harmonics among the subcarriers, stemming from the backscatter principle, can be rejected by numerically calculating the harmonic replicas and subtracting them from the observed signal in a software defined receiver. A frame based signal processing in the receiver results in no relative synchronization error among subcarriers even after the interference rejection. Since the interference rejection can be done before the demodulation and decoding, the concurrency can be secured irrespective to the choice of modulation method. We developed a prototype of MSMA using LabVIEW communications Software Defined Radio environment and prototype sensor tags using discrete electrical parts. The performances and limitation of MSMA using digitally modulated subcarriers are evaluated both in wired and wireless environments with up to four backscatter sensors.

Original languageEnglish
Title of host publicationRFID-TA 2018 - 2018 IEEE International Conference on RFID Technology and Applications
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538650561
DOIs
Publication statusPublished - 2018 Nov 29
Event2018 IEEE International Conference on RFID Technology and Applications, RFID-TA 2018 - Macao, China
Duration: 2018 Sep 262018 Sep 28

Other

Other2018 IEEE International Conference on RFID Technology and Applications, RFID-TA 2018
CountryChina
CityMacao
Period18/9/2618/9/28

Keywords

  • Interference Rejection
  • Passive backscatter
  • Software Defined Radio
  • Structural Health Monitoring

ASJC Scopus subject areas

  • Instrumentation
  • Computer Networks and Communications

Fingerprint Dive into the research topics of 'Perfectly synchronized streaming from digitally modulated multiple backscatter sensor tags'. Together they form a unique fingerprint.

  • Cite this

    Mitsugi, J., Kawakita, Y., Egawa, K., & Ichikawa, H. (2018). Perfectly synchronized streaming from digitally modulated multiple backscatter sensor tags. In RFID-TA 2018 - 2018 IEEE International Conference on RFID Technology and Applications [8552806] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/RFID-TA.2018.8552806