Circuit and method for deriving the word timing of a pulse posit

Details Circuit and method for deriving the word timing of a pulse posit Circuit and method for deriving the word timing of a pulse posit

1988-08-31

1989-09-12

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

329313, 455608, 370 10, H04K 904

Patent

active

048667382

ABSTRACT:
A method of deriving the word timing or word boundaries of a PPM signal, without requiring a synchronizing marker to be added to the PPM signal, employs a bipolar evaluation signal which begins at any time slot of the PPM signal. The evaluation signal is multiplied repeatedly with successive portions of the PPM signal within a time frame of the PPM signal which extends over a plurality of word lengths, and the product signals are integrated. Such repeated multiplications with subsequent integration are performed a number of times, with the evaluation signal being offset by one time slot each time. The time position of the evaluation signal which, after repeated multiplication and integration, produces the smallest possible signal, is considered to be in phase synchronism with the word timing of the PPM signal.

REFERENCES:
patent: 3852718 (1974-12-01), De Lyria
patent: 4206316 (1980-06-01), Burnswig et al.
patent: 4357634 (1982-11-01), Chung
patent: 4527276 (1985-07-01), Gutleber
patent: 4584720 (1986-04-01), Garrett
patent: 4648133 (1987-03-01), Vilnrotter
patent: 4656431 (1987-04-01), Chapman
Gee L. Lui et al., "On Joint Symbol and Frame Synchronization for Direct-Detection Optical Communication Systems," IEEE Transactions on Communications, vol. COM-35, No. 2 (Feb., 1987) pp. 250-255.
Costas N. Georghiades, "Joint Baud and Frame Synchronization in Direct Detection Optical Communication," IEEE Transactions on Communications, vol. COM--33, No. 4 (Apr., 1985) pp. 357-360.
Costas N. Georghiades, "Optimum Joint Slot and Symbol Synchronization for the Optical PPM Channel," IEE Transactions on Communications, vol. COM-35, No. 6 (Jun., 1987) pp. 632-636.

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