zifi: wireless lan discovery via zigbee interference signatures

	zifi: wireless lan discovery via zigbee interference signatures
	Zhou Ruogu ; Xiong Yongping ; Xing Guoliang ; Sun Limin ; Ma Jian
	2010
会议名称	16th Annual Conference on Mobile Computing and Networking, MobiCom 2010
会议日期	September
会议地点	Chicago, IL, United states
关键词	Algorithms Computer operating systems Energy conversion Experiments Global system for mobile communications Laptop computers Mobile ad hoc networks Mobile computing Mobile devices Signal detection Signal processing Technical presentations Telecommunication networks Wireless local area networks (WLAN)
页码	49-60
英文摘要	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. Copyright 2010 ACM.
收录类别	EI
会议主办者	SIGMOBILE
会议录	Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM
会议录出版地	United States
ISBN号	9781450000000
内容类型	会议论文
源URL	[http://124.16.136.157/handle/311060/8974]
专题	软件研究所_基础软件国家工程研究中心_会议论文
推荐引用方式 GB/T 7714	Zhou Ruogu,Xiong Yongping,Xing Guoliang,et al. zifi: wireless lan discovery via zigbee interference signatures[C]. 见:16th Annual Conference on Mobile Computing and Networking, MobiCom 2010. Chicago, IL, United states. September.