Blackberry Corporation

Research in Motion Corporation

Nortel Networks Corporation

Rockstar Bidco, LP

Ilya Averin

David Damian Bevan

Denis Lysyakov

Alexander Flaksman

Victor T Ermolayev

Damian Bevan

A method of estimation of a location of a terminal within an area of coverage of a wireless network comprising at least one fixed node. The method comprises estimating the location of the terminal on the basis of at least a comparison between data representing a first metric of a complex frequency response of a radio channel between the terminal and one of the at least one fixed node and data representing a plurality of stored metrics. Each of the plurality of stored metrics being related to one of a plurality of different locations within the network and each stored metric being of a complex frequency response measured between the one of the fixed nodes and the location within the network to which the metric relates.

RF fingerprinting for location estimation

The location of a terminal is estimated within an area of coverage of a wireless network comprising at least one fixed node by measuring a complex frequency response of a radio channel between the terminal and one of said fixed nodes and estimating the location of the terminal on the basis of at least a comparison between data representing a first metric of the measured complex frequency response and data representing a plurality of stored metrics, each of said plurality of stored metrics being related to one of a plurality of different locations within the network and each stored metric being of a complex frequency response measured between the said one of said fixed nodes and the location within the network to which the metric relates.

The invention provides a method of predicting the power of a received wireless signal (e.g. as received by a mobile device), the method having the steps of: sampling the power of the received wireless signal over an observation interval to obtain a series of values representative of the power of the received wireless signal over the observation interval; and extrapolating the series of values beyond the observation interval to predict the future power of the received wireless signal. In a preferred embodiment of the invention, the method has the steps of: sampling the power of the received wireless signal over an observation interval to obtain a first series of values representative of the power of the received wireless signal over the observation interval; performing an additive white gaussian noise smoothing operation on the first series of values to give a series of smoothed samples over the observation interval, and removing the bias due to the influence of the additive white gaussian noise; performing least mean squares curve fitting on the smoothed samples; fitting a second order polynomial curve to the smoothed samples; and extrapolating the fitted curve beyond the observation interval to predict the future power of the received wireless signal. Also provided are a wireless device (e.g. a mobile phone) having signal processing apparatus operable to perform such a method, and a wireless communications network including a plurality of such wireless devices.

Method of predicting wireless signal power

Growing community of inventors

Nizhny Novgorod, Russia

Ilya Averin