Device for recovering a carrier wave provided with a circuit for

Details Device for recovering a carrier wave provided with a circuit for Device for recovering a carrier wave provided with a circuit for

1991-06-06

1993-08-03

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 83, 329304, H03D 318

Patent

active

052336310

ABSTRACT:
The invention concerns a device for recovering a carrier wave provided with a circuit for inhibiting dummy frequency hookings or acquisitions for phase-modulated digital signals in N states with a phase N=2P, device including a phase locking loop provided with demodulation, a voltage-controllable oscillator, a 90.degree. phase shifter, for the low-pass filtering of basic band signals X1(t) and Y1(t), a loop filter, for sampling the signals X1(t) and Y1(t) and having a sampling frequency Fe so that Fe>(2p+1.vertline.n.vertline.)/T where T is the reciprocal value of the modulation speed and, associated with this loop, a circuit for drawing up the filtered signals Sign Sin (2P .PHI.k) and Sign Cos (2P .PHI.k) required for detection of the direction of variation of the phase error, a phase/frequency comparator, loss of synchronization and hooking detection and an adaptive filter.

REFERENCES:
patent: 4704582 (1987-11-01), Dixon et al.
patent: 5025455 (1991-06-01), Nguyen
patent: 5115454 (1992-05-01), Kucar

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