MEJORAS EN DEMODULADOR PARA SENALES DE IMPULSO RECTANGULARES DE MODULACION

The invention provides an apparatus and method for coherent phase demodulation [Fig. 1 (14); Fig. 2] of a binary phase shift keyed carrier [Fig. 1 (20)] including sequentially processing plus and minus polarity samples of plural carrier segments occurring within each carrier data symbol. The samples for each segment provide a binary coded signal for producing corresponding first [Figs. 2, 9A (Ii, Qi)] and second relative phase angle vector signals (I2i, Q2i). The second vector signals are summed over several data symbols to generate reference phase angle signal vector signals [Figs. 2, 9B, (IR, QR)]. Correlation signals [Figs. 2, 9C (77, +M, -M)] are produced from phase comparison of each of the first vectors with the reference vector signals. The correlation signals are summed [Figs. 2, 9C (84)] in a synchronized relationship for the carrier segments included in each data symbol. The sums of the correlation signals represent either positive or negative correlations [Figs. 2, 9C (32)] with the one and zero data bits of the carrier data symbols.