Description: This article gives an analysis of digital broadcasting systems, which are currently found wide using. Investigated digital modulation techniques that are used in these systems. A comparison of the energy and spectral efficiency of digital modulation. In the process of mathematical modeling of estimated energy required for the transmission of in-formation with the same probability of bit error for each type of modulation. Substantiated expediency of using different modulation techniques for certain digital broadcast systems.
Keywords: digital broadcasting, digital modulation, frequency spectrum, energy efficiency, spectral efficiency, the probability of error, the filter bandwidth