Embracing Interference in Wireless Systems » książka
Embracing Interference in Wireless Systems
ISBN-13: 9781627055444 / Angielski / Twarda / 2014 / 173 str.
Embracing Interference in Wireless Systems
ISBN-13: 9781627055444 / Angielski / Twarda / 2014 / 173 str.
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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.
The wireless medium is a shared resource. If nearby devices transmit at thesame time, their signals interfere, resulting in a collision. In traditionalnetworks, collisions cause the loss of the transmitted information. For thisreason, wireless networks have been designed with the assumption thatinterference is intrinsically harmful and must be avoided.This book, a revised version of the authors award-winning Ph.D.dissertation, takes an alternate approach: Instead of viewing interferenceas an inherently counterproductive phenomenon that should to be avoided, wedesign practical systems that transform interference into a harmless, andeven a beneficial phenomenon. To achieve this goal, we consider how wirelesssignals interact when they interfere, and use this understanding in oursystem designs. Specifically, when interference occurs, the signals getmixed on the wireless medium. By understanding the parameters of thismixing, we can invert the mixing and decode the interfered packets; thus,making interference harmless. Furthermore, we can control this mixingprocess to create strategic interference that allow decodability at aparticular receiver of interest, but prevent decodability at unintendedreceivers and adversaries. Hence, we can transform interference into abeneficial phenomenon that provides security.Building on this approach, we make four main contributions: We present thefirst WiFi receiver that can successfully reconstruct the transmittedinformation in the presence of packet collisions. Next, we introduce a WiFireceiver design that can decode in the presence of high-powercross-technology interference from devices like baby monitors, cordlessphones, microwave ovens, or even unknown technologies. We then show how wecan harness interference to improve security. In particular, we develop thefirst system that secures an insecure medical implant without anymodification to the implant itself. Finally, we present a solution thatestablishes secure connections between any two WiFi devices, without havingusers enter passwords or use pre-shared secret keys.
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