Abstract | ||
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Wearable devices have huge market potential, but their usage has been limited because means to power such devices is still a challenge. Batteries, the most widespread solution, add size, weight and need periodic recharging which is a huge deterrent. In this work, we propose to eliminate batteries by leveraging Wi-Fi transmissions from nearby devices such as access points and smart phones to deliver power wirelessly to wearable devices. We develop a wearable temperature sensor, which harvests energy from Wi-Fi transmissions and transmits data back to an access point. We enable this application by designing an efficient 2.4 GHz Wi-Fi harvesting front-end to power an ANT radio platform with a smartphone as the Wi-Fi source. We study and analyze the effect of OFDM modulation, wide bandwidth (72 MHz) and the bursty nature of 802.11 Wi-Fi signals on the sensitivity, efficiency and the output power of the RF harvester. Our prototype achieves a sensitivity of -16.5 dBm with 100 % duty cycle Wi-Fi transmissions for a target output voltage of 2.05 V and 2.5 μW leakage at the storage capacitor node. This translates to an operating range of about 11.5 cm from a 2 dBm Wi-Fi transmitter on a smartphone and 92 cm from a 20 dBm Wi-Fi access point with a 3 dBi antenna on the wearable device. |
Year | DOI | Venue |
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2015 | 10.1109/RFID.2015.7113072 | IEEE RFID |
Field | DocType | ISSN |
Transmitter,Capacitor,Wearable computer,Duty cycle,Electronic engineering,Radio frequency,Bandwidth (signal processing),Engineering,Wearable technology,Orthogonal frequency-division multiplexing,Embedded system | Conference | 2374-0221 |
Citations | PageRank | References |
5 | 0.53 | 0 |
Authors | ||
5 |
Name | Order | Citations | PageRank |
---|---|---|---|
Vamsi Talla | 1 | 357 | 16.00 |
Stefano Pellerano | 2 | 191 | 32.98 |
Hongtao Xu | 3 | 87 | 9.52 |
Ashoke Ravi | 4 | 176 | 26.87 |
Yorgos Palaskas | 5 | 226 | 32.58 |