METHOD OF DEMODULATING DIFFERENTIAL PHASE-SHIFT MODULATION SIGNALS AND APPARATUS FOR REALSING SAID METHOD

摘要

FIELD: information technology.;SUBSTANCE: method of demodulating differential phase-shift modulation (DPM) signals involves generation of a rectangular pulse sequence Sn(t) from a filtered demodulated signal S(t), generation of two reference rectangular pulse sequences cn(t) and sn(t) corresponding to signs of instantaneous values of in-phase cos(2πf₀t) and quadrature sin(2πf₀t) signals with frequency f₀ equal to mean frequency of the demodulated signal, deriving two correlation functions X(t) and Y(t) over the duration T of each element of the demodulated signal S(t), taking readings X_n, Y_n of said correlation functions at the end of the signal element, using said readings together with readings X_n-1 and Y_n-1 of said correlation functions obtained at the end of the previous signal element to obtain magnitude values of two differences |X_n-X_n-1| and |Y_n-Y_n-1|, determining the value of the sum of 2 magnitude values of these two differences |X_n-X_n-1| and |Y_n-Y_n-1|, making a decision on the demodulated symbol based on comparison of the value of said sum with a threshold value.;EFFECT: broader functional capabilities.;2 cl, 1 dwg