The active badge location system
ACM Transactions on Information Systems (TOIS)
Experiments on Local Positioning with Bluetooth
ITCC '03 Proceedings of the International Conference on Information Technology: Computers and Communications
Practical robust localization over large-scale 802.11 wireless networks
Proceedings of the 10th annual international conference on Mobile computing and networking
A new time-based algorithm for positioning mobile terminals in wireless networks
EURASIP Journal on Advances in Signal Processing
Indoor localization based on response rate of bluetooth inquiries
Proceedings of the first ACM international workshop on Mobile entity localization and tracking in GPS-less environments
Bluetooth Tracking without Discoverability
LoCA '09 Proceedings of the 4th International Symposium on Location and Context Awareness
A robust to multi-path ranging technique over IEEE 802.11 networks
Wireless Networks
Indoor tracking for mission critical scenarios: A survey
Pervasive and Mobile Computing
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Systems for indoor positioning using radio technologies are largely studied due to their convenience and the market opportunities they offer. The positioning algorithms typically derive geographic coordinates from observed radio signals and hence good understanding of the indoor radio channel is required. In this paper we investigate several factors that affect signal propagation indoors for both Bluetooth and WiFi. Our goal is to investigate which factors can be disregarded and which should be considered in the development of a positioning algorithm. Our results show that technical factors such as device characteristics have smaller impact on the signal than multipath propagation. Moreover, we show that propagation conditions differ in each direction. We also noticed that WiFi and Bluetooth, despite operating in the same radio band, do not at all times exhibit the same behaviour.