Despreading method and arrangement in communication system

Details Despreading method and arrangement in communication system Despreading method and arrangement in communication system

1998-01-16

2000-07-18

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375142, H04L 2730

Patent

active

06091761&

ABSTRACT:
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 (CV.sub.0, . . . , CV.sub.N-1) from N received symbols (s.sub.0, s.sub.1, . . . , s.sub.N-1) in a sequence. The received symbol sequence (s.sub.0, s.sub.1, . . . , s.sub.N-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 (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). Said arbitrary sequence is the same sequence used when generating the Orthogonal Gold Codes. The set of products (s.sub.0 *a.sub.0, s.sub.1 *a.sub.1, . . . , s.sub.N-1 *a.sub.N-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 (CV.sub.0, . . . , CV.sub.N-1)

REFERENCES:
patent: 5353352 (1994-10-01), Dent et al.
patent: 5463657 (1995-10-01), Rice
patent: 5497395 (1996-03-01), Jou
PCT International Search Report dated May 11, 1998.
International Search Report dated Nov. 4, 1997.

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