Patent ID: 7885668
Filing Date: 2011-02-08
Classification: G01S,H04L,H04W

Abstract:
1. A method of operating a user device for processing at least one signal received from at least one transmitter of at least one entity over a wireless transmission medium, the method comprising: (a) determining, at the user device, a transmitter fingerprint set from the at least one signal generated and transmitted by the at least one transmitter of the at least one entity, the transmitter fingerprint set being based on one or more non-data content, physical properties of a transient portion of the at least one signal which uniquely distinguish the at least one transmitter from other transmitters; and (b) determining, at the user device, based at least in part on the transmitter fingerprint set, whether a current network location of the user device is a network location known by the user device, wherein the one or more non-data content, physical properties are of the transient portion of each of the at least one signals and wherein the one or more non-data content, physical properties comprise at least one of frequency, amplitude, phase, standard deviation of normalized amplitude, standard deviation of normalized phase, standard deviation of normalized frequency, variance of change in amplitude, standard deviation of normalized in-phase data, standard deviation of normalized quadrature data, power per section, standard deviation of phase, and average change in Discrete Wavelet Transform (DWT) co-efficient.