Improvement in the linearity of a LINC transmitter using genetic algorithms

This paper proposes an automatically-adjusted linearization method based on the well-known linearization technique LINC (Linear amplification using Nonlinear Components) applied to the base station transmitter. A correction method of the gain and phase imbalances between both amplifying branches in a LINC transmitter is proposed to reduce the adjacent channel interference. A simple architecture is designed to compensate the unmatching between both branches being the, adjusting coefficients calculated by means of a genetic algorithm. Several nonidealities; are included in the analysis to deal with a realistic model, such as quadrature modulator imbalances, reconstruction filters and quantization error.