Proceedings ArticleDOI
Dude, where's my card?: RFID positioning that works with multipath and non-line of sight
Jue Wang,Dina Katabi +1 more
- Vol. 43, Iss: 4, pp 51-62
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TLDR
This paper introduces the first fine-grained RFID positioning system that is robust to multipath and non-line-of-sight scenarios, and exploits multipath to accurately locate RFIDs.Abstract:
RFIDs are emerging as a vital component of the Internet of Things. In 2012, billions of RFIDs have been deployed to locate equipment, track drugs, tag retail goods, etc. Current RFID systems, however, can only identify whether a tagged object is within radio range (which could be up to tens of meters), but cannot pinpoint its exact location. Past proposals for addressing this limitation rely on a line-of-sight model and hence perform poorly when faced with multipath effects or non-line-of-sight, which are typical in real-world deployments. This paper introduces the first fine-grained RFID positioning system that is robust to multipath and non-line-of-sight scenarios. Unlike past work, which considers multipath as detrimental, our design exploits multipath to accurately locate RFIDs. The intuition underlying our design is that nearby RFIDs experience a similar multipath environment (e.g., reflectors in the environment) and thus exhibit similar multipath profiles. We capture and extract these multipath profiles by using a synthetic aperture radar (SAR) created via antenna motion. We then adapt dynamic time warping (DTW) techniques to pinpoint a tag's location. We built a prototype of our design using USRP software radios. Results from a deployment of 200 commercial RFIDs in our university library demonstrate that the new design can locate misplaced books with a median accuracy of 11~cm.read more
Citations
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A Survey of Indoor Localization Systems and Technologies
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SpotFi: Decimeter Level Localization Using WiFi
TL;DR: SpotFi only uses information that is already exposed by WiFi chips and does not require any hardware or firmware changes, yet achieves the same accuracy as state-of-the-art localization systems.
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Wi-Fi Fingerprint-Based Indoor Positioning: Recent Advances and Comparisons
Suining He,S.-H. Gary Chan +1 more
TL;DR: This survey overviews recent advances on two major areas of Wi-Fi fingerprint localization: advanced localization techniques and efficient system deployment.
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CSI-Based Fingerprinting for Indoor Localization: A Deep Learning Approach
TL;DR: In this article, a deep-learning-based indoor fingerprinting system using channel state information (CSI) is presented, which includes an offline training phase and an online localization phase.
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E-eyes: device-free location-oriented activity identification using fine-grained WiFi signatures
TL;DR: This paper presents device-free location-oriented activity identification at home through the use of existing WiFi access points and WiFi devices (e.g., desktops, thermostats, refrigerators, smartTVs, laptops) in a low-cost system that can uniquely identify both in-place activities and walking movements across a home by comparing them against signal profiles.
References
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Proceedings ArticleDOI
RADAR: an in-building RF-based user location and tracking system
TL;DR: RADAR is presented, a radio-frequency (RF)-based system for locating and tracking users inside buildings that combines empirical measurements with signal propagation modeling to determine user location and thereby enable location-aware services and applications.
Book
Spectral analysis of signals
Petre Stoica,Randolph L. Moses +1 more
TL;DR: 1. Basic Concepts. 2. Nonparametric Methods. 3. Parametric Methods for Rational Spectra.
Journal ArticleDOI
LANDMARC: indoor location sensing using active RFID
TL;DR: This paper presents LANDMARC, a location sensing prototype system that uses Radio Frequency Identification (RFID) technology for locating objects inside buildings and demonstrates that active RFID is a viable and cost-effective candidate for indoor location sensing.
Journal ArticleDOI
Toward accurate dynamic time warping in linear time and space
Stan Salvador,Philip K. Chan +1 more
TL;DR: This paper introduces FastDTW, an approximation of DTW that has a linear time and space complexity and shows a large improvement in accuracy over existing methods.
BookDOI
RFID handbook : fundamentals and applications in contactless smart cards, radio frequency identification and near-field communication
Klaus Finkenzeller,Dörte Müller +1 more
TL;DR: The Third Edition of RFID: The Architecture of Electronic Data Carriers focuses on the architecture of Transponders and Contactless SmartCards, as well as security and selection Criteria for RFID Systems, which addresses attacks on RFID systems.