STUDY OF CHARACTERISTICS OF DIGITAL ALGORITHM OF COHERENT DEMODULATION OF SIGNAL WITH QUADRATURE AMPLITUDE SHIFT KEYING

The article deals with the problem of signal processing and creation of noise-immune communication. Stability to various types of distortion, increase in speed and increase of noise immunity are challenges that the developers of signal reception and processing equipment face. The subject of the study is the algorithm for demodulation of signals with quadrature shift keying. In the article we give the block diagram and the operating principle of the proposed algorithm for digital coherent demodulation of signals with quadrature shift keying, its advantages and disadvantages are considered with respect to other known algorithms. We carried out a statistical simulation of the device implementing the developed algorithm for digital coherent demodulation of signals by quadrature amplitude shift keying. In the results of the simulation we estimated the noise immunity of coherent demodulation of signals with quadrature amplitude shift keying. The developed algorithm and the corresponding device for coherent digital demodulation of signals with quadrature amplitude shift keying can be used to create equipment for noise-immune communication.