Timing signal correction system for use in direct sequence sprea

Details Timing signal correction system for use in direct sequence sprea Timing signal correction system for use in direct sequence sprea

1984-03-23

1987-03-24

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

370 18, H04L 702

Patent

active

046530762

ABSTRACT:
A direct sequence spread spectrum transmitter and receiver can be synchronized when the timing reference frequency is less than or equal to the data sampling rate and the ratio of the data sampling rate to the timing reference is an integer by combining two, four or eight consecutive data samples to yield one data sample point. By combining these data samples, an optimum data sample point may be determined while receiving an alternating sign preamble by comparing the magnitudes of all possible summations and selecting the sample which gives a maximum output. If each sample is assigned to its own synchronization point, then synchronization may be accomplished by locking to the time that gives the maximum output.

REFERENCES:
patent: 3947634 (1976-03-01), Betts
patent: 4164628 (1979-08-01), Ward et al.
patent: 4203071 (1980-05-01), Bowles et al.
patent: 4301537 (1981-11-01), Roos
patent: 4423517 (1983-12-01), Danno et al.
patent: 4485477 (1984-11-01), Nossen

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