Root spectral estimation for location based on TOA

As it is well known, Non Line Of Sight (NLOS) and multipath propagation bias Time Of Arrival (TOA) estimate, reducing the accuracy of positioning algorithms. High-resolution first arriving path detector from propagation channel estimates based on the Minimum Variance (MV) and Normalized Minimum Variance (NMV) estimates of the power delay profile yields high accurate TOA estimation even in high multipath scenarios. The aim of this paper is to present root versions of the MV and NMV algorithms and to analyse the improvements in positioning accuracy obtained by the new approaches.