PHYSICAL MODELING OF COMMUNICATION SYSTEMS WITH QUADRATURE PHASE SHIFT KEYING

Abstract

The article proposes research tasks for students of polytechnic universities, in which high-frequency signals with quadrature phase modulation (QPSK) are studied, and physical and mathematical models are developed using the basic MATLAB product. The functional scheme of a digital communication system with QPSK modulation with four phase shifts is considered as the main model. The different level of complexity of the research task makes it possible to consider and graphically represent high-frequency signals with QPSK modulation both without interference and against the background of additive white Gaussian noise. The Fourier transforms are chosen as a mathematical model of the spectral characteristics of signals, which is due to the consistency of curricula in mathematical analysis and physics at polytechnic universities. Prospects of such an approach to modeling a wide range of physical processes and phenomena are determined. The proposed approach will be useful in the development of research and computational-graphical problems in physics.