Method and apparatus for spreading and despreading data in a spr

Details Method and apparatus for spreading and despreading data in a spr Method and apparatus for spreading and despreading data in a spr

1998-11-24

2000-07-18

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375146, 370310, H04L 2730, H04B 700

Patent

active

060917598

ABSTRACT:
A current mode of operation is provided to a Walsh spreader (203), and based on the current mode of operation, the Walsh spreader (203) either varies a Walsh code at a symbol rate, or holds the Walsh code constant. During multi-carrier transmission a first symbol within a data stream (210) is spread with a first Walsh code, while symbols immediately preceding and following the first symbol are spread by a another, differing Walsh code. The sequence of Walsh codes exiting the spreader (201) is further scrambled by a pair of Pseudo-Noise (PN) codes (224) that are held constant for three Walsh code periods during multi-carrier transmission, and are not held constant during direct-spread transmission.

REFERENCES:
patent: 5583884 (1996-12-01), Maruyama et al.
patent: 5761239 (1998-06-01), Gold et al.
patent: 5790591 (1998-08-01), Gold et al.

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