METHOD FOR CORRELATION OF SIGNAL WITH A TIME VARYING PULSE-WIDTH AND CORRELTOR THEREOF

摘要

A correlation method adaptively operated to a time varying phase and a device thereof are provided to optimally demodulate a digital signal in an environment generating signal phase variation by determining references in consideration of variation of response signals between tags and determining other references in the consideration of bit variation of the response signals of the same tag. A correlating part(120) performs the first correlation according to a reference value and interval for correlating a received signal. A calculator(140) calculates average variation of the received signal based on a result of the first correlation. A reference determiner(170) determines a new reference value for performing the second correlation based on the average variation. A selector(195) selects a maximum value of the result of the second correlation. A reference storing part(130) stores the reference values and intervals. The correlating part performs the second correlation according to the new reference value and interval. The reference interval is determined by considering the bit variation.