Adaptive despreader

Details Adaptive despreader Adaptive despreader

1995-07-31

1997-11-25

Chin, Wellington

Pulse or digital communications

Repeaters

Testing

36472416, 371 21, 371 30, 371 41, H04B 1500

Patent

active

056920067

ABSTRACT:
A method and apparatus for adaptively despreading a direct sequence spread spectrum signal. The direct sequence spread spectrum signal is provided to a transversal filter. The output of the filter is demodulated to provide a soft symbol. The soft symbol is provided to an error corrector which generates an error corrected version of the soft symbol, referred to as a hard symbol. The value of the hard symbol is subtracted from the soft symbol to generate an error symbol. The error symbol is then used to compute tap values of the transversal filter by an LMS algorithm.

REFERENCES:
patent: 5359624 (1994-10-01), Lee et al.
patent: 5422908 (1995-06-01), Schilling
patent: 5533012 (1996-07-01), Fukasawa et al.
patent: 5594754 (1997-01-01), Dohi et al.
patent: 5596600 (1997-01-01), Dimos et al.

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