Robotics-based location sensing using wireless ethernet
Proceedings of the 8th annual international conference on Mobile computing and networking
A Probabilistic Room Location Service for Wireless Networked Environments
UbiComp '01 Proceedings of the 3rd international conference on Ubiquitous Computing
Error characteristics of ad hoc positioning systems (aps)
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Location sensing and privacy in a context-aware computing environment
IEEE Wireless Communications
SIMPLE: developing a LBS positioning solution
MUM '05 Proceedings of the 4th international conference on Mobile and ubiquitous multimedia
Calibration-free WLAN location system based on dynamic mapping of signal strength
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
Information Sciences: an International Journal
Redpin - adaptive, zero-configuration indoor localization through user collaboration
Proceedings of the first ACM international workshop on Mobile entity localization and tracking in GPS-less environments
WHLocator: hybrid indoor positioning system
Proceedings of the 2009 international conference on Pervasive services
R-factor: a new parameter to enhance location accuracy in RSSI based real-time location systems
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
Indoor localization without the pain
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Sub-area localization: a simple calibration free approach
Proceedings of the 13th ACM international conference on Modeling, analysis, and simulation of wireless and mobile systems
Dynamic channel model LMS updating for RSS-based localization
HAIS'11 Proceedings of the 6th international conference on Hybrid artificial intelligent systems - Volume Part II
Efficient WiFi-based indoor localization using particle swarm optimization
ICSI'11 Proceedings of the Second international conference on Advances in swarm intelligence - Volume Part I
A Polygonal Method for Ranging-Based Localization in an Indoor Wireless Sensor Network
Wireless Personal Communications: An International Journal
WiGEM: a learning-based approach for indoor localization
Proceedings of the Seventh COnference on emerging Networking EXperiments and Technologies
Towards fine-grained radio-based indoor location
Proceedings of the Twelfth Workshop on Mobile Computing Systems & Applications
EV-Loc: integrating electronic and visual signals for accurate localization
Proceedings of the thirteenth ACM international symposium on Mobile Ad Hoc Networking and Computing
Measurement-driven performance analysis of indoor femtocellular networks
Proceedings of the seventh ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
ARIEL: automatic wi-fi based room fingerprinting for indoor localization
Proceedings of the 2012 ACM Conference on Ubiquitous Computing
ArrayTrack: a fine-grained indoor location system
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
Walkie-Markie: indoor pathway mapping made easy
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
PinPoint: localizing interfering radios
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
A Multisensor Architecture Providing Location-based Services for Smartphones
Mobile Networks and Applications
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Using wireless LAN technology for location estimation provides alternate means to enable location-based applications without investment in sensor network infrastructure and special hardware. However, the main drawback of wireless LAN-based location systems is calibration of signal strength as a function of location in spatially high-density, which consumes manual labor and needs to be carried out repeatedly. In this paper, we analyze empirical error characteristics of calibration-based location algorithms such as triangulation in various spatial densities of calibration, using commercially available wireless LAN products. Then, we propose Triangular Interpolation and eXtrapolation (TIX), a calibration-free location algorithm, and present empirical performance evaluation. TIX can achieve mean distance error within 5.4 m, which is comparable to within 4.7 m errors of the calibration-based algorithms. We also present theoretical analysis on error characteristics of the location algorithms deriving accuracy limits and quantifying the effect of RF measurement and calibration.