Derangement detector in a receiver of a system for data transmis

Details Derangement detector in a receiver of a system for data transmis Derangement detector in a receiver of a system for data transmis

1977-09-20

1979-08-21

Griffin, Robert L.

Telegraphy

Systems

Printing

178 67, H04B 116, H04L 2724, H04L 2722

Patent

active

041654889

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 interval 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 .vertline.x.sub.3 .vertline.-kx.sub.3, where k<tan (.pi./p) and x.sub.3, x.sub.3 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.

REFERENCES:
patent: 3747024 (1973-07-01), Choquet et al.
patent: 4076956 (1978-02-01), Dogliotti et al.

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