WiFi AP position estimation using contribution from heterogeneous mobile devices

We analyze a statistical characteristics of WiFi RSSI difference from heterogeneous devices and propose its normal distributed model for cancelling the effect of the diversity of devices on WiFi AP´s RSSI measurements. To evaluate the accuracy enhancement of WiFi AP position through WiFi RSSI difference correction, four devices with different WiFi chipsets are used to collect measurements in a small-scale testbed. As a result, the correction can normalize WiFi RSSI measurements from heterogeneous devices into WiFi RSSI measurements from a reference device so that the quick and accurate survey is achievable by using multiple devices in wide indoor area. Furthermore, user generated contribution, which uses heterogeneous devices, can be easily applied to the WiFi AP position estimation by using this correction.