Patent ID: 7873367
Filing Date: 2011-01-18
Classification: G01S,H04W

Abstract:
1. A method in a locationing module of an Radio Frequency (RF) switch for locating a first wireless device having a first type within a wireless network comprising a plurality of second wireless devices having a second type, comprising the steps of: identifying an overlap area corresponding to the intersection of RF ranges for the plurality second wireless devices; computing a set of signal strength values, each associated with a measure of RF signal strength received by the plurality of second wireless devices from the first wireless device; evaluating a decision metric for a plurality of locations within the overlap area based on the set of signal strength values, wherein the decision metric is a minimum mean square error (MMSE) defined by where N is the number of second wireless devices seen by the first wireless device, where N>1, RSSI determining the location of the first wireless device by selecting, from the plurality of locations, a location having the optimum value of the decision metric within the overlap area.