QUASI-COHERENT DEMODULATOR OF QUADRATURE PHASE-SHIFT KEYING SIGNALS Russian patent published in 2016 - IPC H04L27/22 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used in telecommunication systems and data transmission in radio systems. Device comprises tuned generator 1, phase shifter 2 on π/2, first and second phase detectors 3 and 4, signal polarity switch 5, first and second voltage comparators 6 and 7, pulse generator 8, first time delay line 9, XOR logical circuit 10, reversible counter 11, digital-analogue converter (DAC) 12, first adder 13, first signal multiplier 14, second adder 15, integrator 16, first scaling voltage divider 17, loop gain setting and stabilisation unit (BUSPU) 18 and control phase unit (BUF) 19. BUSPU unit comprises first and second units for raising current voltage value to power of two 20 and 21, third adder 22, unit for raising current voltage value to power of ½ 23 and second voltage divider 24. BUF unit includes second, third, fourth and fifth signal multipliers 25, 27, 28, 29, as well as second time delay line 26.

EFFECT: technical result is integrated (simultaneous) improvement of main parameters of quasi-coherent demodulator, particularly a wider capture range and retaining a synchronous operating mode, shorter time for entering synchronous operating mode, high noise immunity in presence of destabilising factors affecting loop gain of device.

2 cl, 4 dwg