H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/74
H04L 27/233 (2006.01)
Patent
CA 1121871
PHF 76.584 10.9.1977 ABSTRACT: A receiver of a system for data transmission by means of p-phase modulation comprises a digital phase discriminator with a calculating unit which calculates in a first interval of each sampling period the in-phase and quadrature components of a signal derived from a passband signal at sampling instant jT by a phase rotation over an angle equal and opposite to the phase of a reference carrier at instant (j-1)T. A simple derangement detector is obtained by means of a sign detector for a component supplied by the calculating unit during a second inter- val of each sampling period, the phase of the reference carrier then having been subjected to a phase rotation equal to the phase variation of the transmitted carrier, and by means of a calculated circuit which calculates the quantity ? ?3 ? -kx3, where k < tan(.pi./p) and x3, ?? are the in-phase and quadrature components supplied by the calculating unit during a third interval of each sampling period, the phase of the reference carrier then having been subjected to an additional phase rotation equal to +(.pi.?p) or -(.pi./p) depending on the sign determined by the sign detector, Alarm pulses are supplied at a negative sign of the quantity calculated by the calculating circuit. -21-
287730
Guidoux Loic B.y.
Renaudat Jean-Louis
Compagnie Des Signaux
Van Steinburg C.e.
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