| Reference : Wi-Fi butterfly effect in indoor localization: The impact of imprecise ground truth a... |
| Scientific congresses, symposiums and conference proceedings : Paper published in a book | |||
| Engineering, computing & technology : Computer science | |||
| http://hdl.handle.net/10993/32589 | |||
| Wi-Fi butterfly effect in indoor localization: The impact of imprecise ground truth and small-scale fading | |
| English | |
Popleteev, Andrei  [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >] | |
| Oct-2017 | |
| 14th IEEE Workshop on Positioning, Navigation and Communications (WPNC-2017) | |
| Yes | |
| 14th IEEE Workshop on Positioning, Navigation and Communications (WPNC-2017) | |
| 25-10-2017 to 26-10-2017 | |
| [en] indoor localization ; small-scale fading ; ground truth ; fingerprinting ; radio propagation ; Wi-Fi butterfly effect ; performance evaluation ; experiment design | |
| [en] The increasing accuracy of indoor positioning systems makes their evaluation an increasingly challenging task. A number of factors are already known to affect performance of fingerprint-based systems: hardware diversity, device orientation, environment dynamics.
This paper presents a new butterfly-like effect in localization experiments. The effect is caused by minor ground truth (GT) errors --- that is, small deviations between calibration and test positions. While such deviations are widely considered as purely additive and thus negligible, we demonstrate that even centimeter-scale GT errors are amplified by small-scale radio fading and lead to severe multi-meter Wi-Fi positioning errors. The results show that fingerprint-based localization accuracy quickly deteriorates as GT errors increase towards 0.4 wavelength (5 cm for 2.4 GHz). Beyond that threshold, system's accuracy saturates to about one-third of its original level achievable with precise GT. This effect challenges the impact of the already known accuracy-limiting factors (such as cross-user tests, receiver diversity, device orientation and temporal variations), as they can be partially explained by minor GT errors. Moreover, for smartphone-in-a-hand experiments, this effect directly associates the evaluation outcomes with experimenters' diligence. | |
| Interdisciplinary Centre for Security, Reliability and Trust (SnT) > Networking Research Group (NetLab) | |
| Fonds National de la Recherche - FnR | |
| Researchers ; Professionals ; Students | |
| http://hdl.handle.net/10993/32589 | |
| FnR ; FNR8311593 > Andrei Popleteev > INDOORS > Indoor Navigation With Ambient Radio Signals > 01/02/2015 > 31/07/2017 > 2014 |
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