Gesture Control

An apparatus including one or more radio transmitters configured to transmit radio signals that are at least partially reflected by an object or objects moving as a consequence of a gesture; multiple radio receivers configured to receive the transmitted radio signals after having been at least partially reflected by an object or objects moving as a consequence of a gesture; a detector configured to detect an attribute of the received signals, for each receiver, that varies with the position of the object or objects moving as a consequence of the gesture; and a controller configured to interpret the detected attributes, for the receivers, as a user input associated with the gesture.