Nonlinear predistortion of OFDM signals over frequency-selective fading channels

The linearization technique known as amplitude and phase (AB;Pi predistorti on, recently proposed by D'Andrea and Lottici, is applied to the orthogonal frequency-division multiplexing (OFDM) transmission context with nonlinear radio-frequency high-power amplification, The above technique is shown to provide a major enhancement in power efficiency in comparison with the unpr otected system, as well as a nonnegligible gain over an alternative lineari zation strategy, identified as minimum mean-square-error (MMSE) predistorti on, recently presented in the literature for application to OFDM. The relat ive performance of the A&P and the MMSE predistorter schemes is assessed ov er the additive white Gaussian noise channel and also in a frequency-select ive fading environment, The impact of adjacent channel interference is also discussed.