Mechanism for extracting hybrid (fh/ds) spread spectrum signals

Details Mechanism for extracting hybrid (fh/ds) spread spectrum signals Mechanism for extracting hybrid (fh/ds) spread spectrum signals

1993-02-25

1994-11-08

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

053634012

ABSTRACT:
Identification and extraction of hybrid, frequency-hopped direct sequence pseudo noise (FH/DS), signals from a multiband signal environment is effected by a sequential signal processing technique which examines the distribution of the energy content within a prescribed sub-spectrum window that is iteratively scanned or `slides` across the overall signal spectrum of interest. Based upon this energy content distribution, in particular the extent to which a sub-spectrum window contains energy that exhibits significant conjugate phase symmetry associated with a direct spread signal, the inventive signal processing technique proceeds to emphasize the spectral composition of components of which hybrid signals are comprised and to deemphasize the spectral composition of signals other than those contained in hybrid signals. Potential hybrid signal candidates whose spectral composition has been emphasized are then selectively combined with the deemphasized signals to isolate and identify the hybrid signals.

REFERENCES:
patent: 5016255 (1991-05-01), Dixon
patent: 5136611 (1992-08-01), Kirimoto et al.
patent: 5150377 (1992-09-01), Vannucci
patent: 5175744 (1992-12-01), Crespo et al.
patent: 5208829 (1993-05-01), Soleimani et al.
patent: 5237586 (1993-08-01), Bottomley

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