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Article

Design of a 900 MHz Dual-Mode SWIPT for Low-Power IoT Devices

1
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla, CA 92093, USA
2
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
3
Nanoelectronics Group, Department of Informatics, University of Oslo, 0316 Oslo, Norway
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(21), 4676; https://doi.org/10.3390/s19214676
Received: 13 July 2019 / Revised: 22 October 2019 / Accepted: 23 October 2019 / Published: 28 October 2019
(This article belongs to the Section Internet of Things)
This paper presents a duty cycle-based, dual-mode simultaneous wireless information and power transceiver (SWIPT) for Internet of Things (IoT) devices in which a sensor node monitors the received power and adaptively controls the single-tone or multitone communication mode. An adaptive power-splitting (PS) ratio control scheme distributes the received radio frequency (RF) energy between the energy harvesting (EH) path and the information decoding (ID) path. The proposed SWIPT enables the self-powering of an ID transceiver above 20 dBm input power, leading to a battery-free network. The optimized PS ratio of 0.44 enables it to provide sufficient harvested energy for self-powering and energy-neutral operation of the ID transceiver. The ID transceiver can demodulate the amplitude-shift keying (ASK) and the binary phase-shift keying (BPSK) signals. Moreover, for low-input power level, a peak-to-average power ratio (PAPR) scheme based on multitone is also proposed for demodulation of the information-carrying RF signals. Due to the limited power, information is transmitted in uplink by backscatter modulation instead of RF signaling. To validate our proposed SWIPT architecture, a SWIPT printed circuit board (PCB) was designed with a multitone SWIPT board at 900 MHz. The demodulation of multitone by PAPR was verified separately on the PCB. Results showed the measured sensitivity of the SWIPT to be −7 dBm, and the measured peak power efficiency of the RF energy harvester was 69% at 20 dBm input power level. The power consumption of the injection-locked oscillator (ILO)-based phase detection path was 13.6 mW, and it could be supplied from the EH path when the input power level was high. The ID path could demodulate 4-ASK- and BPSK-modulated signals at the same time, thus receiving 3 bits from the demodulation process. Maximum data rate of 4 Mbps was achieved in the measurement. View Full-Text
Keywords: IoT devices; information decoding; PAPR; RF energy harvester; reconfigurable; simultaneous wireless information and power transceiver IoT devices; information decoding; PAPR; RF energy harvester; reconfigurable; simultaneous wireless information and power transceiver
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MDPI and ACS Style

Abbasizadeh, H.; Kim, S.Y.; Samadpoor Rikan, B.; Hejazi, A.; Khan, D.; Pu, Y.G.; Hwang, K.C.; Yang, Y.; Kim, D.I.; Lee, K.-Y. Design of a 900 MHz Dual-Mode SWIPT for Low-Power IoT Devices. Sensors 2019, 19, 4676. https://doi.org/10.3390/s19214676

AMA Style

Abbasizadeh H, Kim SY, Samadpoor Rikan B, Hejazi A, Khan D, Pu YG, Hwang KC, Yang Y, Kim DI, Lee K-Y. Design of a 900 MHz Dual-Mode SWIPT for Low-Power IoT Devices. Sensors. 2019; 19(21):4676. https://doi.org/10.3390/s19214676

Chicago/Turabian Style

Abbasizadeh, Hamed; Kim, Sang Y.; Samadpoor Rikan, Behnam; Hejazi, Arash; Khan, Danial; Pu, Young G.; Hwang, Keum C.; Yang, Youngoo; Kim, Dong I.; Lee, Kang-Yoon. 2019. "Design of a 900 MHz Dual-Mode SWIPT for Low-Power IoT Devices" Sensors 19, no. 21: 4676. https://doi.org/10.3390/s19214676

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