Demodulation method and demodulator for digital signals with amp

Details Demodulation method and demodulator for digital signals with amp Demodulation method and demodulator for digital signals with amp

1989-06-23

1991-05-28

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 84, 329313, H04L 2714

Patent

active

050200801

ABSTRACT:
The disclosed method consists in sampling the phase of the detected modulated signal, inside each symbol T period, with a comb of sampling pulses obtained from N clock pulses evenly spaced out by a time interval equal to T/N; computing the differential phase angle d.phi. between symbols for each phase sample of the detected current symbol, encoding each differential phase angle d.phi. in assigning it an encoding cost, computing the sums of the encoding costs for the samples of the same order belonging to a determined number L of consecutive symbols; memorizing, among the N sums obtained, that sum which gives the greatest result, taking, as a symbols synchronizing clock, that clock which, in the comb of pulses, has the same order as the order of the sample which have lead to the greatest sum and decoding the differential phase angle having the same order as the memorized sample.

REFERENCES:
patent: 4242641 (1980-12-01), Houdard
patent: 4862483 (1989-08-01), Clark
IEEE Transactions on Communications, vol. COM-33, No. 12, Dec. 1985, pp. 1285-1290, IEEE, NY U.S., S. J. Simmons, et al.
IEEE Global Telecommunications Conference, Houston, Tex, Dec. 1-14, 1986, `Communications Broadening Technology Horizons`, Conf. Record, vol. 2 & 3, pp. 1078-1082, G. Troullinos.

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