Range-free localization schemes for large scale sensor networks
Proceedings of the 9th annual international conference on Mobile computing and networking
Measuring the Impact of Slow User Motion on Packet Loss and Delay over IEEE 802.11b Wireless Links
LCN '03 Proceedings of the 28th Annual IEEE International Conference on Local Computer Networks
Multipath profile discrimination in TOA-based WLAN ranging with link layer frames
WiNTECH '06 Proceedings of the 1st international workshop on Wireless network testbeds, experimental evaluation & characterization
Digital rights management using a mobile phone
Proceedings of the ninth international conference on Electronic commerce
Sensor Measurements for Wi-Fi Location with Emphasis on Time-of-Arrival Ranging
IEEE Transactions on Mobile Computing
Authorised domain management using location based services
Mobility '07 Proceedings of the 4th international conference on mobile technology, applications, and systems and the 1st international symposium on Computer human interaction in mobile technology
DRM domain authentication using electronic payment systems
Proceedings of the 10th international conference on Electronic commerce
Self-Localization in a Low Cost Bluetooth Environment
UIC '08 Proceedings of the 5th international conference on Ubiquitous Intelligence and Computing
SofTOA: Software Ranging for TOA-Based Positioning of WLAN Terminals
LoCA '09 Proceedings of the 4th International Symposium on Location and Context Awareness
Tracking mobile targets indoors using WLAN and time of arrival
Computer Communications
A performance analysis of the AoE protocol
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Digital rights management using a master control device
ASIAN'07 Proceedings of the 12th Asian computing science conference on Advances in computer science: computer and network security
A survey on localization for mobile wireless sensor networks
MELT'09 Proceedings of the 2nd international conference on Mobile entity localization and tracking in GPS-less environments
A robust to multi-path ranging technique over IEEE 802.11 networks
Wireless Networks
Timing-Based Mobile Sensor Localization in Wireless Sensor and Actor Networks
Mobile Networks and Applications
Comparative performance evaluation of IEEE 802.11v for positioning with time of arrival
Computer Standards & Interfaces
Demo: distance tracking using WLAN time of flight
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
CAESAR: carrier sense-based ranging in off-the-shelf 802.11 wireless LAN
Proceedings of the Seventh COnference on emerging Networking EXperiments and Technologies
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This publication explores the degree of accuracy to which the propagation delay of WLAN packets can be measured using today's commercial, inexpensive equipment. The aim is to determine the distance between two wireless nodes for location sensing applications. We conducted experiments in which we measured the time difference between sending a data packet and receiving the corresponding immediate acknowledgement. We found the propagation delays correlate closely with distance, having only a measurement error of a few meters. Furthermore, they are more precise than received signal strength indications. To overcome the low time resolution of the given hardware timers, various statistical methods are applied, developed and analyzed. For example, we take advantage of drifting clocks to determine propagation delays that are forty times smaller than the clocks' quantization resolution. Our approach also determines the frequency offset between remote and local crystal clocks.