Compensation of nonlinear distortions for orthogonal multicarrier schemes using predistortion

In the Digital Terrestrial Television Broadcasting European project, the orthogonal frequency division multiplexing (OFDM) technique is seen as a good candidate. In this paper, characterization of the effects of a nonlinear channel over the OFDM signal is performed for 16-QAM and 64-QAM signal constellations. As expected, the attained performance is poor when compared to a single carrier scheme. To improve the performance low-complexity predistortion techniques are applied. It is shown that a predistorted OFDM system achieves almost the same performance as a single carrier scheme without predistortion