Open loop demodulator for narrowband continuous backscatter wireless links

Jin Mitsugi, Yuusuke Kawakita

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

Abstract

Concurrent backscatter communication with multiple battery-free sensors suffers from the frequency instability of dedicated subcarrier caused by the process-power supply voltage-temperature (PVT) characteristic of the radio frequency integrated circuit (RFIC) in the battery-free sensor. This paper proposes an all-digital open-loop carrier and timing recovery circuit, which uses the most likelihood estimation of subcarrier frequency, and the delayed detection exploiting the differential zero-crossing points as the symbol timing recovery triggers. The proposal is implemented in a software defined interrogator. Conducted testing with a fading simulator and real world wireless testing with the battery-free backscatter sensors in 920 MHz band reveal the effectiveness of the proposal.

Original languageEnglish
Title of host publication2022 IEEE Wireless Communications and Networking Conference, WCNC 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1425-1430
Number of pages6
ISBN (Electronic)9781665442664
DOIs
Publication statusPublished - 2022
Event2022 IEEE Wireless Communications and Networking Conference, WCNC 2022 - Austin, United States
Duration: 2022 Apr 102022 Apr 13

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
Volume2022-April
ISSN (Print)1525-3511

Conference

Conference2022 IEEE Wireless Communications and Networking Conference, WCNC 2022
Country/TerritoryUnited States
CityAustin
Period22/4/1022/4/13

Keywords

  • Backscatter communication
  • Battery-free sensor
  • delayed detection
  • Digitally controlled ring oscillator

ASJC Scopus subject areas

  • Engineering(all)

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