Selective orthogonal predistortion for power amplifiers

Many factors could be considered to produce spectral regrowth in communications systems as well as the nonlinearity of power amplifiers. This paper proposes a novel reduced complexity dual band power amplifier (PA) digital predistortion. A new approach that is based on orthogonal polynomials is presented to overcome the limits of the nonlinear compensation using power series inverses. Its main properties and operational conditions have been detailed with the theory of orthogonal polynomial models. The proposed compensation technique provides an intuitive means of spectral regrowth analysis, and high accuracy tool.