DSSS communications correlation

Details DSSS communications correlation DSSS communications correlation

1992-12-31

1994-05-24

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 455 65, H04L 2730

Patent

active

053156153

ABSTRACT:
Method of processing a direct sequence spread spectrum communication system signal wherein digital data comprised of data bits is modulated by a first pseudo-noise code comprised of a sequence of chips, the pseudo-noise chip rate greater than said date bit rate, each chip having a chip period, said sequence repeating at a code period, and the pseudo-noise modulated data modualates a carrier frequency resulting in the signal. Digital samples are made of the signal. A second pseudo-noise code replicates the first pseudo-noise code. A first correlation is made of the sampled signal and the second pseudo-noise code. A second correlation is made of the sampled signal and the second pseudo-noise code delayed by one chip period. A first correlated signal energy value represents the signal energy of the first correlation. A second correlated signal energy value represents the signal energy of the second correlation. The first and second correlated signal energy values are combined to obtain the combined value of correlated signal energy. The second pseudo-noise code is time syncronized to maximize the combined value of correlated signal energy, thereby time locking the first pseudo-noise code and the second pseudo-noise code.

REFERENCES:
patent: 4862478 (1989-08-01), McIntosh
patent: 5081643 (1992-01-01), Schilling
patent: 5132986 (1992-07-01), Endo et al.
patent: 5179573 (1993-01-01), Paradise
patent: 5179574 (1993-01-01), Watanabe et al.

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