Patent ID: 6714586
Filing Date: 2004-03-30
Classification: H04B

Abstract:
A method for finding a spreading code sequence in a received spread spectrum signal, comprising:(a) receiving a spread spectrum signal having a spreading code sequence of a first predetermined length; (b) matched-filtering sample values of a segment of the received signal of a second predetermined length with a portion of a reference code, the second predetermined length and the portion of the reference code being substantially shorter than the first predetermined length; (c) obtaining a correlation value from the matched-filtering; (d) stepping sample values of the received signal to provide sample values of another segment of the received signal of the second length; (e) stepping the reference code by an amount corresponding to the stepping of the sample values, to form another portion of the reference code; and (f) returning to step (b) to perform the matched-filtering using the sample values of the other segment of the received signal and the other portion of the reference code to enable cycling through steps (b) through (f) one or more times until the correlation value indicates a predetermined level of matching of the received signal to the spreading code sequence.