Patent ID: 6370357
Filing Date: 2002-04-09
Classification: G01S,H04W

Abstract:
A method for estimating a speed of a mobile communication apparatus in a digital mobile communication network comprising:receiving samples of a signal from said mobile communication apparatus, said samples arranged in time slots; deriving a power signal from said samples; and estimating an offset autocorrelation value of said power signal by correlating said power signal with a version of itself offset in time, said offset autocorrelation value representative of said speed of said mobile communication apparatus, said estimating said offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating said power signal with a version of said power signal displaced by a predetermined number of time slots; and summing each said single time slot offset autocorrelation value to estimate said offset autocorrelation value.