Analysis of the energy characteristics of M – QAM signals at turning of signal constellations

Abstract

The paper considers the effect of the rotation of the signal constellation on the energy characteristics (signal to noise ratio) of quadrature multi-point modulation methods. Based on the error vector in the Matlab + Simulink simulation environment, models of M - QAM modulators and demodulators with rotation of the signal constellations at an arbitrary angle are elaborated.