Patent ID: 8520790

Claim:
A frame synchronization method based on differential correlation in a communication system, comprising: performing a correlation analysis by using a sync word in a first search window and a second search window, wherein the first window is placed before the second window, for respectively obtaining a plurality of first-window correlation values and a plurality of second-window correlation values; selecting N maximum correlation values from the first-window correlation values, wherein indexes of the maximum correlation values are I 1 -I N , and N is an integer greater than 0; comparing the second-window correlation values to a first threshold; defining an index of the second-window correlation value as J if the second-window correlation value is greater than the first threshold; and using the index J to perform a check step if the index J is equal to one of the indexes I 1 -I N , so as to confirm that a position of the index J is a header position, wherein the check step comprises: performing at least one pilot analysis in the second search window according to the index J, so as to obtain a pilot correlation accumulating value; and confirming that the position of the index J is the header position if the pilot correlation accumulating value reaches a third threshold.