Method of demodulation using split delay line

Details Method of demodulation using split delay line Method of demodulation using split delay line

1989-06-28

1990-05-01

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329336, 375 80, 375 84, H04L 2722

Patent

active

049222066

ABSTRACT:
A method is disclosed for demodulating binary differential phase shift keyed signals in the presence of carrier frequency uncertainties. In phase modulation, a data signal is impressed on a carrier frequency to produce a modulated signal. The modulated signal and a corresponding quadrature signal are input to a split delay line, wherein each half of the delay line provides a delay of one-half the data signal bit period. The modulated and the delayed signals are input to a summing junction to provide a combined output independent of the carrier frequency. Thus, the method of demodulation is insensitive to Doppler shifts and other carrier frequency offsets.

REFERENCES:
patent: 4317210 (1982-02-01), Dekker et al.
patent: 4567442 (1986-01-01), Haussmann
patent: 4674105 (1987-06-01), Suzuki
patent: 4737729 (1988-04-01), Haussmann
patent: 4746872 (1988-05-01), Yamagata
M. Simon and D. Divsalar, "Open Loop Frequency Synchronization of MDPSK with Doppler", 1987 IEEE/ICC Proceedings, 7.7.1-7.7.7.
D. Divsalar and M. Simon, "MSAT-X Doppler-Corrected Differential Detection" MSAT-X Quarterly, No. 17, Oct. 1988, pp. 14-19.

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