Application of orthogonal coding in conjunction with discrete amplitude modulation

Abstract

Abstract Most works on coding theory are devoted to the analysis of systems in that part of the bandwidth curve, which corresponds to low spectral efficiency or low signal-to-noise ratio. The reason for this factor is the fact that most of the applications using coding theory used in satellite systems are limited in terms of the used power, but with a wide bandwidth. Thus, to date, none of the coding schemes used can provide noise immunity and significant energy gain with high spectral efficiency. The research of ways to increase noise immunity at a fixed transmission rate through the development of special mathematical methods is an urgent task.