Enabling instantaneous feedback with full-duplex backscatter

Vincent Liu, Vamsi Talla, Shyamnath Gollakota
2014 Proceedings of the 20th annual international conference on Mobile computing and networking - MobiCom '14  
This paper introduces the first design that enables fullduplex communication on battery-free backscatter devices. Specifically, it gives receivers a way to provide low-rate feedback to the transmitter on the same frequency as that of the backscatter transmissions, using neither multiple antennas nor power-consuming cancellation hardware. Our design achieves this goal using only fully-passive analog components that consume near-zero power. We integrate our design with the backscatter network
more » ... scatter network stack and demonstrate that it can minimize energy wastes that occur due to collisions and also correct for errors and changes in channel conditions at a granularity smaller than that of a packet. To show the feasibility of our design, we build a hardware prototype using offthe-shelf analog components. Our evaluation shows that our design cancels the self-interference down to the noise floor, while consuming only 0.25 µW and 0.54 µW of transmit and receive power, respectively.
doi:10.1145/2639108.2639136 dblp:conf/mobicom/LiuTG14 fatcat:er3d37ggc5hjvpo2vckxs7fifi