Abstract
A simple technique to estimate the position of a given mobile source inside a building is based on the received signal strength. For this methodology to have a reasonable accuracy, radio visibility of the mobile by at least three access points is required. To reduce the number of the required access points and therefore simplify the underlying coverage design problem, we propose a novel scheme that takes into account the distribution of RF energy around the receiver. In other words, we assume that the receiver is equipped with a circular array antenna with beamforming capability. In this way, the spatial spectrum of the received power can be measured by electronically rotating the main lobe around the 360-degree field of view. This spatial spectrum can be used by a single receiver as a means for estimating the position of the mobile transmitter. In this paper, we investigate the feasibility of this methodology, and show the improvement achieved in the positioning accuracy.
Highlights
In recent years, technologies that find the location of mobile sources inside buildings are becoming an attractive area of research and development
The underlying philosophy in this paper is that exploiting the information in the spatial distribution of RF energy around a receiver results in better estimates of the location of a mobile
This spatial spectrum basically represents a signature that only depends on the relative location of the transmitter with respect to the receiver and the environment surrounding
Summary
Technologies that find the location of mobile sources inside buildings are becoming an attractive area of research and development. The general philosophy in this approach is to establish a one-to-one correspondence between a given position and the average received signal strength from at least three transmitters with known locations. One such system that has been implemented on the existing wireless local area network infrastructure is RADAR [2]. By using a more generalized and sophisticated radio-map that contains received signal strength information from various directions, the system would have the capability of estimating the mobile position with fewer access points and possibly higher accuracy.
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