Demodulating method and apparatus particularly for demodulating

Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...

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375 84, 375 81, H03D 300

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active

052372871

ABSTRACT:
A method and apparatus are described for demodulating a modulated signal having a carrier component and a data component, in which the modulated signal is split into at least two parts one of which is delayed with respect to the other, and the two parts are multiply-coupled and linearly-combined to produce a combined output corresponding to a function of the data component independent of the carrier component frequency. In the described method and apparatus the undelayed part is coupled with the delayed part in a multiport coupler, wherein the parts are relatively phase-shifted to produce a plurality of phase-shifted signals; and the phase-shifted signals are linearly combined such that the data component, in the function of the combined output, is not affected by variations in frequency or phase of the carrier component. This enables a robust direct-detection DPSK receiver.

REFERENCES:
patent: 3818346 (1974-06-01), Fletcher et al.
patent: 4057759 (1977-11-01), Genova et al.
patent: 4715047 (1987-12-01), Hambley
patent: 4942591 (1990-07-01), Nease et al.

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