SU468386A1 - Device for receiving signals with phase shift keying - Google Patents

Description

(54) DEVICE FOR RECEPTION OF SIGNALS WITH PHASE MANIPULATION

I The invention relates to telecommunications and can be used to receive signals. with phase manipulation.

: A device for receiving signals,; with phase shift keying, comprising phase I detectors, one of which is connected to a reference oscillator through a phase shifter.

However, the known device for receiving i signals with phase shift keying is not sufficiently robust. ; The aim of the invention is an increase in c. mechanical stability.

For this purpose, a phase handler and delay lines are introduced into the device, with the output of one of the phase detectors connected to; The signal input of the phase handler is connected via a series-connected phase handler, another phase detector and a reference oscillator, and the information input of the other i-th phase detector is connected to the information input of the first phase detector via a delay line.I

The drawing shows the block diagram of the device i .;

 The device for receiving signals with phase manipulation contains phase detectors 1.2, phase shifter 3, frequency controlled reference oscillator 4, delay line 5 and phase manipulator 6. Received phase-shift keyed signal is fed to input 7 of the set-,

and further to the information input of the phase detector, as well as through the delay line 5 to the information input of the phase detector 2. The output of the reference generator 4

connected to the signal input of the phase ma-1 nipulator 6, to another input of which the output of the phase detector 1 and output 8 of the device are connected. The output of the phase manipulator; the Torah 6 is connected to the second input of the phase

detector 2, the output of which is connected to the input of the reference generator 4. The output of the reference generator 4 through the phase shifter 3 is connected to the second input of the phase detector 1. The device operates as follows, i

In the absence of 7 phasomani1H / l - at the input signal, the reference generator 4 produces a signal whose chargot is close to: the nominal frequency of the signal. This signal is fed through the phase manipulator 6 to the second input of the phase detector 2, and also as a reference oscillator through the phase shifter 3 to the second input of the phase detector 1. С; supplying the phase-shifted signal to the input 7 of the device begins the process of capturing the phase-locked loop often. You, consisting of a phase detector 2, a reference generator 4, and a phase manipulator 6. In the steady state operation of the device, the information input of the phase detector 2 via delay line 5 receives the received phase-shift keyed signal, and the second input of this phase tector is the oscillation of the reference generator 4, phase-matched signal from the output of the phase detector 1. The phase change limits of the above two signals are the same, for which the delay time of the delay line 5 is chosen to be equal to the travel time c igna on the circuit: phase detector 1 - manipulator 6. On the interval of action of sending the oscillation phase on the information and second inputs of phase detector 2, they always differ by a constant value corresponding to the state of stable equilibrium and phase loop loop, top tuning of the frequency. For coherent detection, a moto of the phaeomanipulated signal is compensated by the phase shifter 3 for an additional. run phase, introduced by the delay line 5 and the loop phase-locked loop. Phase manipulator 6 depending on the sign

The voltage I at the output of the phase detector 1 introduces a phase shift equal to or 180 to the output oscillation with respect to the oscillation at its signal input. To ensure the health of the formation scheme of the reference

the variations in the correspondence between the polarity of the voltage at the control input of the manipulator 6 and the phase shift introduced by it are set depending on the detector characteristics of the phase detector 1 and the phase shifts introduced by the loop of the phase auto tuning frequency, the delay line 5 and the phase shifter 3. Invention Device for receiving signals with phase manipulation, containing phase detectors, one of which is connected to a reference oscillator through a phase shifter, which i in that, in order to increase the interference noise into device / operation. phase manipulator and pini delay are introduced, and the output of one of the phase detectors is connected to the signal input of the phase manipulator four through 1 without successively connected phase manipulator. another phase detector and a support-I generator, and the information input of another phase detector through the delay line i is connected to the information input of the first phase detector.