Adaptive accurate indoorlocalization using passive rfid

Abstract—In many pervasive applications like the intelligent bookshelves in libraries, it is essential to accurately locate the items to provide the location-based service, e.g., the average lo-calization error should be smaller than 50 cm and the localization delay should be within several seconds. Conventional indoor-localization schemes cannot provide such accurate localization results. In this paper, we design an adaptive, accurate indoor-localization scheme using passive RFID systems. We propose two adaptive solutions, i.e., the adaptive power stepping and the adaptive calibration, which can adaptively adjust the critical parameters and leverage the feedbacks to improve the localization accuracy. The realistic experiment results indicate that, our adaptive localization scheme can achieve an accuracy of 31 cm within 2.6 seconds on average. Keywords—Indoor localization, adaptive, accurate, passive R-FID tag, calibration, power stepping I