| 摘要 |
The invention relates to a method and an arrangement for implementing a bank of correlators, corresponding to a set of Orthogonal Gold codes, in a receiver used in a Direct Sequence Code Division Multiple Access system (DS-CDMA). The bank of correlators generates N correlation values (CV0,...,CVN-1) from N received symbols (s0,s1,...,sN-1) in a sequence. The received symbol sequence (s0,s1,...,sN-1), where each symbol has been spread by an Orthogonal Gold code respectively, is buffered (401). The buffered symbol sequence is multiplied (402) element-by-element with an arbitrary sequence (a0,a1,...,aN-1), in order to obtain a set of products (s0*a0,s1*a1,...,sN-1*aN-1). Said arbitrary sequence is the same sequence used when generating the Orthogonal Gold Codes. The set of products (s0*a0,s1*a1,...,sN-1*aN-1) is then permuted (403) in order to obtain a sequence, which is equal to a sum of a number of sequences from a set of Walsh sequences. The sequence is then transformed (404) with Fast Hadamard Transform as to obtain said correlation values (CV0,...,CVN-1).
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