METHOD FOR DEMODULATION OF SHORT-TIME SIGNALS WITH MULTILEVEL ABSOLUTE PHASE MODULATION IN FADING CONDITIONS Russian patent published in 2019 - IPC H04L27/22 

FIELD: radio equipment.

SUBSTANCE: method for demodulation of short-term signals of multilevel absolute phase modulation in fading conditions consists in performing analog-to-digital conversion of input random process (IRP), solving the task of detecting a signal in a IRP to start or stop a demodulator, determining elementary chip boundaries using a clock synchronization device (CSD), extracting a first elementary send from a processed sample of the received signal and its phase shift by 90° using Hilbert transformation, recording the first elementary sending of the received signal and its delayed by 90° copies into storage devices (RAM) for further use as reference oscillations, under the control of CSD, detection of the received signal by a quadrature method – multiplication of the current elementary transmission and stored in the memory device of the first elementary sending of a signal and its copy, which is phase-delayed by 90°, integrating detected voltages separately in the in-phase and quadrature channels and solving the system of equations for determining the value of the received information symbol in the decision-making device.

EFFECT: reduced minimum duration of communication session, as well as reduced probability of error P_er demodulation of absolute FM-M signals during radio line fading.

1 cl, 6 dwg