The wireless medium is a shared resource. If nearby devices
transmit at the same time, their signals interfere, resulting in a
collision. In traditional networks, collisions cause the loss of
the transmitted information. For this reason, wireless networks
have been designed with the assumption that interference is
intrinsically harmful and must be avoided. This book, a revised
version of the author's award-winning Ph.D. dissertation, takes an
alternate approach: Instead of viewing interference as an
inherently counterproductive phenomenon that should to be avoided,
we design practical systems that transform interference into a
harmless, and even a beneficial phenomenon. To achieve this goal,
we consider how wireless signals interact when they interfere, and
use this understanding in our system designs. Specifically, when
interference occurs, the signals get mixed on the wireless medium.
By understanding the parameters of this mixing, we can invert the
mixing and decode the interfered packets; thus, making interference
harmless. Furthermore, we can control this mixing process to create
strategic interference that allow decodability at a particular
receiver of interest, but prevent decodability at unintended
receivers and adversaries. Hence, we can transform interference
into a beneficial phenomenon that provides security. Building on
this approach, we make four main contributions: We present the
first WiFi receiver that can successfully reconstruct the
transmitted information in the presence of packet collisions. Next,
we introduce a WiFi receiver design that can decode in the presence
of high-power cross-technology interference from devices like baby
monitors, cordless phones, microwave ovens, or even unknown
technologies. We then show how we can harness interference to
improve security. In particular, we develop the first system that
secures an insecure medical implant without any modification to the
implant itself. Finally, we present a solution that establishes
secure connections between any two WiFi devices, without having
users enter passwords or use pre-shared secret keys.
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