Compensation for Nonlinear Distortion in OFDM Systems Using a Digital Predistorter Based on the SCPWL Model

Orthogonal frequency division multiplexing (OFDM) is an attractive technique for achieving high-bit-rate wireless data transmission. However, multicarrier systems such as OFDM show great sensitivity to nonlinear distortion. In this paper, we propose a simplicial canonical piecewise-linear (SCPWL) model based digital predistorter to compensate for nonlinear distortion introduced by a high power amplifier (HPA) in OFDM systems. The performance of the new predistortion scheme for OFDM systems is evaluated in terms of bit error rate (BER) and total degradation (TD). The simulation results demonstrated that the proposed predistorter achieves significant performance improvement by effectively compensating for the nonlinear distortion introduced by the HPA.