We build low-cost RX and TX base units and battery-free sensor nodes with multiple sensing modalities and evaluate the performance of the MultiScatter system in various deployments. Our system circumvents the inherent limitations of backscatter systems-including the limited coverage area, frequency-dependent operability, and sensor node limitations in handling network tasks-by introducing several coordination techniques between the base units starting from a single RX-TX pair to networks with many RX and TX units. To address this, we design the first wide-area and scalable backscatter network with multiple receivers (RX) and transmitters (TX) base units to communicate with battery-free sensor nodes. Realizing the vision of ubiquitous battery-free sensing has proven to be challenging, mainly due to the practical energy and range limitations of current wireless communication systems.
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