Patent ID: 6965635
Filing Date: 2005-11-15
Classification: H04B

Abstract:
1. A correlation detection method capable of creating a delay profile of a reception signal with a delay equivalent to a maximum of X chips, where X is a natural number, the method comprising: extracting and fixing a first 1-symbol equivalent data from the data string of said reception signal; continuously generating spreading codes with a delay increment of 1-chip by changing an amount of phase shift of the spreading codes between 0 chip and X chips, multiplying the first 1-symbol equivalent data by the spreading codes generated to obtain despreading results, integrating with respect to said despreading results while changing integration segments in association with virtual delimiters of the reception signal symbols which are uniquely determined in accordance with the phase shift amount of said spreading codes and storing the integration values; further extracting and fixing a second 1-symbol equivalent data adjacent to the first fixed 1-symbol equivalent data and performing the continuous generating of spreading codes; adding integration values corresponding to the same phase shift amount of the spreading codes obtained by the continuously generating spreading codes and by the further extracting and fixing, which is assumed to be the integration values with respect to the same symbol when virtual delimiters of said reception signal symbols are considered and calculating a correlation value on one symbol; and comparing calculated symbol-unit correlation values and detecting an amount of actual delay of said reception signal based upon a detected maximum correlation value.