Patent ID: 6522706
Filing Date: 2003-02-18
Classification: H04B,H04L

Abstract:
A method for estimating a delay spread of a received signal waveform transmitted through a time-varying multi-path propagation channel, said method comprising the steps of:sampling a segment of said signal waveform that corresponds to a predetermined synchronization sequence, resampling said sampled received segment at a high sampling rate, correlating said synchronization sequence with said resampled segment corresponding to different sampling times, computing a correlation energy profile from said correlations, determining the peak energy value and its position within said correlation energy profile, computing correlation energy values at preselected equal offsets, before and after said position of said peak energy value, determining a maximum of said offset correlation energy values, computing a delay criterion, based on the ratio of said maximum offset correlation energy value to said peak energy value, and referencing said delay criterion to a predetermined lookup table to obtain an estimate of the delay spread.