POSITIONING TECHNIQUE

A technique for positioning a target object in a wireless communication environment. A data model models several sample points. Each sample point includes a location and a set of expected signal values therein. A set of relevance indicators indicates one or more sets of relevant sample points, which are subsets of the sample points in the data model. Signal values are observed at the target object's location. Based on the signal value observations and the set of relevance indicators, a current set of relevant sample points is determined and used, along with the signal value observations, to estimate the target object's location. Computational burden is reduced because sample points not included in the current set of relevant sample points can be omitted from calculations.