This paper describes a study of the performance
improvement of Wireless LAN (WLAN) positioning system using
spot information for pedestrian navigation systems. Spot
information presents the names of landmarks, stores, rooms on
walls, signboards or door plates. On the positioning procedure, a
user first sends a spot name in front of him explicitly and BSSID
and received signal strength information from WLAN implicitly
to a positioning server. Then the server program specifies the
user’s position using a spot information database and WLAN
database. The spot information database includes the lists of
spots’ names and their coordinates and the WLAN database
includes the list of BSSIDs and received power strength data and
their observed coordinates. This system must be registered a spot
name by the user which want to get his location.