An Application of Amplitude and Phase Predistortion to OFDM Systems

The linearization technique known as amplitude and phase (A&P) predistortion, recently proposed by the authors in [1], is applied to the OFDM transmission context with nonlinear RF high-power amplification. The above technique is shown to provide a major enhancement in power efficiency in comparison with the unprotected system, as well as a nonnegligible gain over an alternative linearization strategy, identified as minimum mean square error (MMSE) predistortion, recently presented in the literature for application to OFDM. The relative performance ofthe A&P and the MMSE PD schemes is assessed over the AWGN channel and also in a frequency-selective fading environment.