BPSK And QPSK transmission systems having phase locked loop for

Details BPSK And QPSK transmission systems having phase locked loop for BPSK And QPSK transmission systems having phase locked loop for

1982-03-10

1985-01-01

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 23, 331 25, H03L 708

Patent

active

044918054

ABSTRACT:
The invention relates to a device for regenerating a carrier wave from a BPSK or QPSK modulation signal. The device multiplies the received signal by two or four depending on whether it has a BPSK or QPSK modulation. The multiplication delivers a reference signal. The device also has a locked loop comprising a voltage-controlled oscillator. A frequency divider is connected between the oscillator output and a second input of a comparator, the output of which is connected to the control input of the oscillator. The central frequency of the oscillator is equal to three times the nominal frequency f.sub.o of the received modulated signal. The output of the oscillator is connected to one input of a mixer having another input which receives the reference signal and the output of which is connected to the first input of the phase comparator. The frequency divider divides by three to deliver the regenerated carrier wave. Identical band-pass filters have a central frequency equal to f.sub.o and are disposed between (a) the output of the mixer and the first input of the phase comparator and (b) between the output of the divider by three and the second input of the phase comparator.

REFERENCES:
patent: 4292594 (1981-09-01), David et al.

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