Method for determining data bit transitions for a low level...

Details Method for determining data bit transitions for a low level... Method for determining data bit transitions for a low level...

2005-11-29

2005-11-29

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

06970500

ABSTRACT:
Apparatus and methods for determining the timing of the data bit transitions. “N” assumptions of data bit transitions are used for determining N integrations of an incoming spread signal for data bit time periods where N is the data bit time period divided by the code time period. In a first variation, the N assumptions use N start times separated by code time periods. In a second variation, the N assumptions use N sign inversion times separated by code time periods. In either variation the unsigned values of the N integrations, respectively, may be combined for several data bit time periods. The assumed transition timing that results in the strongest of the N integrations is indicative of the timing of the data bit transitions.

REFERENCES:
patent: 5200979 (1993-04-01), Harris
patent: 6075987 (2000-06-01), Camp et al.
patent: 6407699 (2002-06-01), Yang

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