Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
The smart floor: a mechanism for natural user identification and tracking
CHI '00 Extended Abstracts on Human Factors in Computing Systems
Conditional Random Fields: Probabilistic Models for Segmenting and Labeling Sequence Data
ICML '01 Proceedings of the Eighteenth International Conference on Machine Learning
Multi-Camera Multi-Person Tracking for EasyLiving
VS '00 Proceedings of the Third IEEE International Workshop on Visual Surveillance (VS'2000)
An RF-Based System for Tracking Transceiver-Free Objects
PERCOM '07 Proceedings of the Fifth IEEE International Conference on Pervasive Computing and Communications
Challenges: device-free passive localization for wireless environments
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
TileTrack: Capacitive human tracking using floor tiles
PERCOM '09 Proceedings of the 2009 IEEE International Conference on Pervasive Computing and Communications
Dynamic clustering for tracking multiple transceiver-free objects
PERCOM '09 Proceedings of the 2009 IEEE International Conference on Pervasive Computing and Communications
Radio Tomographic Imaging with Wireless Networks
IEEE Transactions on Mobile Computing
A deterministic large-scale device-free passive localization system for wireless environments
Proceedings of the 3rd International Conference on PErvasive Technologies Related to Assistive Environments
Detecting intra-room mobility with signal strength descriptors
Proceedings of the eleventh ACM international symposium on Mobile ad hoc networking and computing
Multiple receiver strategies for minimizing packet loss in dense sensor networks
Proceedings of the eleventh ACM international symposium on Mobile ad hoc networking and computing
See-Through Walls: Motion Tracking Using Variance-Based Radio Tomography Networks
IEEE Transactions on Mobile Computing
RASS: A real-time, accurate and scalable system for tracking transceiver-free objects
PERCOM '11 Proceedings of the 2011 IEEE International Conference on Pervasive Computing and Communications
Proceedings of the 11th international conference on Information Processing in Sensor Networks
A Fade-Level Skew-Laplace Signal Strength Model for Device-Free Localization with Wireless Networks
IEEE Transactions on Mobile Computing
ICDCS '12 Proceedings of the 2012 IEEE 32nd International Conference on Distributed Computing Systems
Doorjamb: unobtrusive room-level tracking of people in homes using doorway sensors
Proceedings of the 10th ACM Conference on Embedded Network Sensor Systems
Towards robust device-free passive localization through automatic camera-assisted recalibration
Proceedings of the 10th ACM Conference on Embedded Network Sensor Systems
It's tea time: do you know where your mug is?
Proceedings of the 5th ACM workshop on HotPlanet
Crowd++: unsupervised speaker count with smartphones
Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing
RF-Based device-free recognition of simultaneously conducted activities
Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication
CoSDEO 2013: device-free radio-based recognition
Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication
Device-free people counting and localization
Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication
Spatially Resolved Monitoring of Radio-Frequency Electromagnetic Fields
Proceedings of First International Workshop on Sensing and Big Data Mining
Proceedings of International Conference on Advances in Mobile Computing & Multimedia
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Radio frequency based device-free passive (DfP) localization techniques have shown great potentials in localizing individual human subjects, without requiring them to carry any radio devices. In this study, we extend the DfP technique to count and localize multiple subjects in indoor environments. To address the impact of multipath on indoor radio signals, we adopt a fingerprinting based approach to infer subject locations from observed signal strengths through profiling the environment. When multiple subjects are present, our objective is to use the profiling data collected by a single subject to count and localize multiple subjects without any extra effort. In order to address the non-linearity of the impact of multiple subjects, we propose a successive cancellation based algorithm to iteratively determine the number of subjects. We model indoor human trajectories as a state transition process, exploit indoor human mobility constraints and integrate all information into a conditional random field (CRF) to simultaneously localize multiple subjects. As a result, we call the proposed algorithm SCPL -- sequential counting, parallel localizing. We test SCPL with two different indoor settings, one with size 150 m2 and the other 400 m2. In each setting, we have four different subjects, walking around in the deployed areas, sometimes with overlapping trajectories. Through extensive experimental results, we show that SCPL can count the present subjects with 86% counting percentage when their trajectories are not completely overlapping. Our localization algorithms are also highly accurate, with an average localization error distance of 1.3 m.