An Enhanced Ranging Scheme Using WiFi RSSI Measurements for Ubiquitous Location

The LBS (Location Based Service) is becoming important part of IT(Information Technology) business. The localization is a core technology for LBS, because the LBS based on a position of each device or user. In case of outdoor, GPS is used to get a position of moving user as dominant technology. But as for indoor environments, GPS is not available. Therefore, for ´Seamless LBS´, an enhanced indoor localization scheme which produces a similar position accuracy to that of GPS is needed. In case of a wireless network, such as IEEE 802.11, a method using a received signal strength indicator (RSSI) for each access point is advantageous because it does not require additional infrastructure and it is suitable for the simplification. In this paper, we will propose dual Log Model that has variable parameters based on WLAN RSSI measurements.