QAM SIGNAL RECEIVING DEVICE Russian patent published in 2021 - IPC H04L27/34 

FIELD: radio engineering.

SUBSTANCE: invention relates to the field of radio engineering and can be used when receiving signals of quadrature-amplitude-modulation (QAM) in radio channels with fading. The device for receiving QAM signals contains a series-connected band-pass filter, a wide-band limiter-amplifier, a quadrator, a high-pass filter, a first phase shifter, a second phase shifter, a phase detector, a first analog-to-digital converter and an amplitude-phase detector, the output of which is the output of the device, and the output of the high-pass filter is connected to the second input of the phase detector, and the input of the band-pass filter is the input of the device, as well as an amplitude detector, the output of which is connected to the input of the second analog-to-digital converter, the output of which is connected to the second input of the amplitude phase detector, additionally a series-connected low-pass filter, an amplitude detector, a band-pass filter, an inverting amplifier and an adjustable amplifier are introduced, the output of which is connected to the input of the amplitude detector, and the output of the bandpass filter is connected, respectively, to the input of the low-pass filter and the second input of the adjustable amplifier.

EFFECT: increasing the noise immunity of receiving elements of the QAM signal in radio channels with fading.

1 cl, 1 dwg