Conference paper Open Access

# PassiveLiFi: Rethinking LiFi for Low-Power and Long Range RF Backscatter

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{
"DOI": "10.1145/3447993. 3483262",
"title": "PassiveLiFi: Rethinking LiFi for Low-Power and Long Range RF Backscatter",
"issued": {
"date-parts": [
[
2021,
11,
4
]
]
},
"abstract": "<p>Light bulbs have been recently explored to design Light Fidelity (LiFi) communication to battery-free tags, thus complementing Radiofrequency (RF) backscatter in the uplink. In this paper, we show that LiFi and RF backscatter are complementary and have<br>\nunexplored interactions. We introduce PassiveLiFi, a battery-free system that uses LiFi to transmit RF backscatter at a meagre power budget. We address several challenges on the system design in the LiFi transmitter, the tag and the RF receiver. We design the first LiFi transmitter that implements a chirp spread spectrum (CSS) using the visible light spectrum. We use a small bank of solar cells for communication and harvesting and reconfigure them based on the amount of harvested energy and desired data rate. We further alleviate the low responsiveness of solar cells with a new low-power receiver design in the tag. Experimental results with an RF carrier of 17 dBm show that we can generate RF backscatter with a range of 80.3 meters/\ud835\udf07W consumed in the tag, which is almost double with respect to prior work.</p>",
"author": [
{
},
{
"family": "Genov\u00e9s Guzm\u00e1n, Borja"
},
{
"family": "Varshney, Ambuj"
},
{
"family": "Giutiniano, Domenico"
}
],
"id": "5644705",
"event-place": "New Orleans, United States",
"type": "paper-conference",
"event": "Annual International Conference On Mobile Computing And Networking (MobiCom 2021)"
}
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