Circularly polarized antennas are used in 2.4 GHz ZigBee radio modules to evaluate performance improvement of RSSI (Received Signal Strength Indicator) based location techniques, with respect to conventional linearly polarized antennas. Experimental RSSI measurements in an indoor environment clearly show that multipath fading is significantly reduced when CP antennas are used; this determines a more reliable estimation of the field amplitude decay law as a function of the distance of the mobile node from the fixed access point, and then a higher location accuracy. At the best of authors' knowledge, it is the first time that the circular polarization features are applied to RSSI-based radio location techniques.
Nepa, P., Cavallo, F., Bonaccorsi, M., Aquilano, M., Carrozza, M., Dario, P. (2011). Experimental Analysis of RSSI-based Indoor Location Systems with WL Circularly Polarized Antennas. In Wireless Mobile Communication and Healthcare Second International ICST Conference, MobiHealth 2010, Ayia Napa, Cyprus, October 18 - 20, 2010, Revised Selected Papers (pp.176-183). Springer Berlin Heidelberg [10.1007/978-3-642-20865-2_23].
Experimental Analysis of RSSI-based Indoor Location Systems with WL Circularly Polarized Antennas
Carrozza M. C.;
2011
Abstract
Circularly polarized antennas are used in 2.4 GHz ZigBee radio modules to evaluate performance improvement of RSSI (Received Signal Strength Indicator) based location techniques, with respect to conventional linearly polarized antennas. Experimental RSSI measurements in an indoor environment clearly show that multipath fading is significantly reduced when CP antennas are used; this determines a more reliable estimation of the field amplitude decay law as a function of the distance of the mobile node from the fixed access point, and then a higher location accuracy. At the best of authors' knowledge, it is the first time that the circular polarization features are applied to RSSI-based radio location techniques.
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