HANDLING CONCEPT DRIFT  IN WIFI-BASED INDOOR LOCALIZATION USING REPRESENTATION LEARNING
Authors: Raihan Seraj, Negar Ghourchian, Michel Allegue-Martinez
Keywords: concept drift, wifi localization, feature representation.
TL;DR: We introduce an augmented robust feature space for streaming wifi data that is capable of tackling concept drift for indoor localization
Abstract: We outline the problem of concept drifts for time series data. In this work, we analyze the temporal inconsistency of streaming wireless signals in the context of device-free passive indoor localization. We show that data obtained from WiFi channel state information (CSI) can be used to train a robust system capable of performing room level localization. One of the most challenging issues for such a system is the movement of input data distribution to an unexplored space over time, which leads to an unwanted shift in the learned boundaries of the output space. In this work, we propose a phase and magnitude augmented feature space along with a standardization technique that is little affected by drifts. We show that this robust representation of the data yields better learning accuracy and requires less number of retraining.