Patent ID: 7945004
Filing Date: 2011-05-17
Classification: H04B

Abstract:
1. A method in a wireless communication device comprising: sampling an initial frequency band input at a first sampling rate to produce a first set of discrete signal samples for the initial frequency band input; comparing at least one energy graph of the first set of discrete signal samples with at least one protocol-specific signature that corresponds to a radio access technology with which the wireless communication device is capable of operating; narrowing down the initial frequency band input to at least one frequency band associated with the at least one protocol-specific signature to produce a subsequent frequency band input, if there is a match between the at least one energy graph and the at least one protocol-specific signature; sampling the subsequent frequency band input at a second sampling rate to produce a second set of discrete signal samples; and comparing at least one energy graph of the second set of discrete signal samples with the at least one protocol-specific signature, wherein the at least one energy graph of the first set of discrete signal samples is either an energy versus frequency graph or an energy versus time graph, and the at least one energy graph of the second set of discrete signal samples is either an energy versus frequency graph or an energy versus time graph.