Integrating RSS from unknown access points in WLAN positioning

Location based services, as well as security issues, require the knowledge of the user's position within an indoor area. Here, we address the problem of how the location service based on a WLAN can profit of the Received Signal Strengths (RSSs) collected from those Access Points (APs) whose position is not available. For this task, we develop two different algorithms, both relying on a dual estimation approach, in which RSS measures from ‘unknown’ APs are used along with RSS from ‘known’ APs. Simulative and experimental analyses, both corroborating the effectiveness of our solutions, are carried out.