Comparison of UWB fingerprinting with vertical and horizontal polarizations for indoor localization

The indoor localization system has been extensively researched because of its various applications. This system requires high accuracy in indoor environments which absence line of sight and dense multipath. Ultra wideband (UWB) fingerprinting is developed for this purpose. This paper discuss about indoor localization using a fingerprinting concept based on UWB signal and compares between vertical and horizontal polarization cases. All of the measurements used biconical antennas as both transmitter (Tx) and receiver (Rx) antennas. The channel frequency transfer functions of corridor environment were measured at frequencies ranging from 3 GHz to 11 GHz. The path loss and delay time of first three-path is investigated to perform the fingerprints and signatures. The accuracy of estimated distances is shown in terms of cumulative distribution function (CDF). From the results, horizontal polarization provides greater accuracy than vertical polarization.