Backscatter Meets Audio: A Step Toward RF Computing

Passive Internet of Things (Passive IoT) has attracted widespread attention from both academia and industry due to its potential for ubiquitous deployment and round-theclock operation without the need for dedicated power sources [1]. As a key enabling technology for Passive IoT, backscatter communication has been an active research area for over a decade and has achieved remarkable progress [2, 3, 4]. We have witnessed the feasibility of implementing backscatter communication using various ambient energy sources [5, 6, 7, 8], with the communication range continuously extending from a few meters to reliably transmitting data over distances of more than one kilometer [9].