Patent ID: 8406280
Filing Date: 2013-03-26
Classification: G01S,H04B

Abstract:
1. A method of mitigating multipath interference in a received signal comprising the steps of: (a) receiving at a user a plurality of RF signals over time intervals from a transmitter, wherein at least one of the plurality of RF signals is a line-of-sight signal and wherein at least one of the plurality of RF signals is a multipath signal; (b) correlating each of the plurality of received signals with delayed versions of a corresponding replica waveform to form a two dimensional matrix, where matrix elements in one dimension correspond to different time intervals; (c) estimating a frequency spectrum of the two dimensional matrix, wherein the estimating the frequency spectrum includes at least one of MUSIC, modified MUSIC, APES, maximum entropy methods, and subspace fitting methods; and (d) identifying, and separating out a signal path of the at least one line-of-sight signal and the at least one multipath signal from the spectrum by a value of phase rates associated with these paths.