Patent ID: 6389089
Filing Date: 2002-05-14
Classification: H04L

Abstract:
A method of identifying a pulse train with known values and a known length in a signal, which comprises the following steps:taking successive samples of a signal and determining whether a phase difference between successive samples of the signal is in a range corresponding to a transmitted symbol â€œ1â€  or in a range corresponding to a transmitted symbol â€œ0â€ ; filtering the symbols estimated in the determining step by placing a search window over the successively estimated symbols, the search window having a length equal to a length of a pulse train to be identified minus one, and forming a symbol sum of the estimated symbols within each search window; comparing the symbol sum with a sum threshold value; and if the symbol sum is greater than or equal to the sum threshold value, indicating a presence of the pulse train in the signal and a temporal position of the pulse train.