Pulse or digital communications – Repeaters – Testing
Patent
1988-05-23
1989-12-05
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 83, 329300, 329304, H03D 318
Patent
active
048857564
ABSTRACT:
A signal may be demodulated without using any analog components by using a digital processor. A digitizer delivers the amplitude of the signal to be demodulated at a sampling rate. The signal is acquired from the digitizer and stored in a common memory. The amplitude samples are converted to phase samples. Symbol rate phase hypotheses are generated for splitting the time signal into slices. The carrier phase for one symbol is then calculated for each symbol rate phase hypothesis so that the carrier phase can be estimated over a plurality of (S) symbols. The symbol phase is compared to the carrier phase so that the demodulated signal may be extracted and so that the quality of the demodulation may be estimated.
REFERENCES:
patent: 4457005 (1984-06-01), Burke et al.
patent: 4516079 (1985-05-01), York
patent: 4728957 (1988-03-01), Hethuin
patent: 4740997 (1988-04-01), Heatherington
IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980, pp. 1190-1196, IEEE, New York, US; C. F. Cahn et al.: "Digital Phase Sampling for Microcomputer Implementation of Carrier Acquisition and Coherent Tracking".
Birot Patrice
Fontanes Sylvain
Marguinaud Andre
Quignon Thierry
Romann Brigitte
Chin Stephen
Griffin Robert L.
Societe Anonyme dite: Alcatel Espace
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