NDLI: ZiFi: wireless LAN discovery via ZigBee interference signatures

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ZiFi: wireless LAN discovery via ZigBee interference signatures

Content Provider	ACM Digital Library
Author	Xing, Guoliang Ma, Jian Zhou, Ruogu Xiong, Yongping Sun, Limin
Abstract	WiFi networks have enjoyed an unprecedent penetration rate in recent years. However, due to the limited coverage, existing WiFi infrastructure only provides intermittent connectivity for mobile users. Once leaving the current network coverage, WiFi clients must actively discover new WiFi access points (APs), which wastes the precious energy of mobile devices. Although several solutions have been proposed to address this issue, they either require significant modifications to existing network infrastructures or rely on context information that is not available in unknown environments. In this work, we develop a system called ZiFi that utilizes ZigBee radios to identify the existence of WiFi networks through unique interference signatures generated by WiFi beacons. We develop a new digital signal processing algorithm called Common Multiple Folding (CMF) that accurately amplifies periodic beacons in WiFi interference signals. ZiFi also adopts a constant false alarm rate (CFAR) detector that can minimize the false negative (FN) rate of WiFi beacon detection while satisfying the user-specified upper bound on false positive (FP) rate. We have implemented ZiFi on two platforms, a Linux netbook integrating a TelosB mote through the USB interface, and a Nokia N73 smartphone integrating a ZigBee card through the miniSD interface. Our experiments show that, under typical settings, ZiFi can detect WiFi APs with high accuracy (<5% total FP and FN rate), short delay (~780 ms), and little computation overhead.
Starting Page	49
Ending Page	60
Page Count	12
File Format	PDF
ISBN	9781450301817
DOI	10.1145/1859995.1860002
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-09-20
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Power management Stochastic signal detection Digital signal processing Interference Wifi network discovery
Content Type	Text
Resource Type	Article

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