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Studies for indoor positioning system based on the fingerprint method are increasing its importance. Improving the accuracy of finger print DB using Wi-Fi AP (Access Point) can give great effects on positioning. In this paper, the authors analyze active Wi-Fi signal phenomena from reference AP which is accessed by multi-users. Some factors which can affect the accuracy of position are studied by comparing signal patterns in the DB and real-time active signals. They propose a modified finger print DB method on both AP connection and AP disconnection which can improve performance accuracy of the positioning.
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