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Open loop demodulator for narrowband continuous backscatter wireless links
Ist Teil von
2022 IEEE Wireless Communications and Networking Conference (WCNC), 2022, p.1425-1430
Ort / Verlag
IEEE
Erscheinungsjahr
2022
Quelle
IEEE Electronic Library (IEL)
Beschreibungen/Notizen
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.