Patent ID: 7197092
Filing Date: 2007-03-27
Classification: H04B,H04L

Abstract:
1. A method of detecting the position in time of a predetermined shape within an analog or digital signal, irrespective of any amplitude modulations and/or offsets within the signal comprising the steps of storing a template of length N incorporating a replica of the signal [s(n)] without multipath; and receiving the signal [s(n)] subject to modulation effects A on pulse shape or peak [p(n)] and vertical offset B where “n” is representative of a time index or samples of the signal; correlating the template with the received signal or multiple sample shifts to create a modulation-compensated received signal to estimate modulation effects of A at a particular time, n; subtracting various sample-shifted versions of the template from the modulation-compensated received signal to produce a corrected modulation-compensated received signal; calculating the average difference between the template and the corrected modulation-compensated received signal to determine the magnitude of the offset B for a particular time, n; and determining the squared error between the template, modified by the determined magnitude of the offset B, and the corrected modulation-compensated received signal, assuming the minimum error to correspond to the correct position of the predetermined shape within the signal.