Pulse or digital communications – Repeaters – Testing
Patent
1997-11-06
1999-11-30
Ghebretinsae, Temesghen
Pulse or digital communications
Repeaters
Testing
375354, H04B 169
Patent
active
059955350
ABSTRACT:
The present invention is a method of synchronizing a digital receiver to a digital transmitter in both frequency and time using a novel ambiguity transformation. The ambiguity transform combines time correlation and spectrum synchronization into an integrated two-dimensional transform process. The ambiguity transform includes the steps of multiplying a reference sequence with a received signal to create a product signal, calculating the magnitude of the spectrum of the product signal, and determining the peak product signal. Through multiple iterations of the ambiguity transform, and time and frequency shifts, a digital receiver may be synchronized to a digital transmitter. The method of the present invention may be implemented using a digital signal processor (DSP).
REFERENCES:
patent: 3864635 (1975-02-01), Ewanus
patent: 4653076 (1987-03-01), Jerrim et al.
Cai Khiem V.
Severance Steven R.
Alkov Leonard A.
Ghebretinsae Temesghen
Lenzen, Jr. Glenn H.
Raytheon Company
Schubert William C.
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