For better CSI Fingerprinting based Localization: a novel phase sanitization method and a distance metric

CSI fingerprinting based localization system is one of the most promising techniques for indoor positioning. CSI phase sanitization and distance measure between the fingerprint and the test point are two important operations, both of which have significant influence on the localization performance. However, there are potential disadvantages of the two operations which limit the system performance in conventional algorithms. In this paper, we propose a novel CSI phase sanitization method and a new distance metric. The two methods are both tested using the CSI measured in office environment. Compared with the conventional methods, they achieve much better performance.