Patent ID: 6091761
Filing Date: 2000-07-18
Classification: H04B,H04J

Abstract:
A method of despreading a symbol sequence (s.sub.0, s.sub.1, . . . , s.sub.N-1) to obtain a number of correlation values (CV.sub.0, . . . , CV.sub.N-1), where said symbol sequence has been spread by a set of Orthogonal Gold sequences (G), which have been generated by means of an arbitrary sequence (a.sub.0, a.sub.1, . . . , a.sub.N-1), comprising the following steps:a) multiplying element-by-element said symbol sequence (s.sub.0, s.sub.1, . . . , s.sub.N-1) with said arbitrary sequence (a.sub.0, a.sub.1, . . . , a.sub.N-1), in order to obtain a set of products (s.sub.0 *a.sub.0, s.sub.1 *a.sub.1, . . . , s.sub.N-1 *a.sub.N-1);b) permuting said set of products (s.sub.0 *a.sub.0, s.sub.1 *a.sub.1, . . . , s.sub.N-1 *a.sub.N-1) in order to obtain a sequence (w) equal to a sum of a number of sequences from a set of Walsh sequences;c) transforming said sequence (w) with a Fast Hadamard Transform to obtain said correlation values (CV.sub.0, . . . , CV.sub.N-1).