A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted...http://www.google.com/patents/US6690747?utm_source=gb-gplus-sharePatent US6690747 - Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing
