TY - GEN
T1 - Open loop demodulator for narrowband continuous backscatter wireless links
AU - Mitsugi, Jin
AU - Kawakita, Yuusuke
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Backscatter communication
KW - Battery-free sensor
KW - Digitally controlled ring oscillator
KW - delayed detection
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U2 - 10.1109/WCNC51071.2022.9771937
DO - 10.1109/WCNC51071.2022.9771937
M3 - Conference contribution
AN - SCOPUS:85130704807
T3 - IEEE Wireless Communications and Networking Conference, WCNC
SP - 1425
EP - 1430
BT - 2022 IEEE Wireless Communications and Networking Conference, WCNC 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE Wireless Communications and Networking Conference, WCNC 2022
Y2 - 10 April 2022 through 13 April 2022
ER -