Waveform Design for Joint PAPR Reduction and Predistortion in OFDM Systems

Abstract

Peak-to-average-power ratio (PAPR) and power amplifier (PA) nonlinearity are significant challenges that limit the performance of orthogonal frequency division multiplexing (OFDM) systems. Various techniques have been proposed to address these two issues separately. In this letter, we propose a unified framework for PAPR reduction and digital predistortion (DPD) by optimizing the waveform of the OFDM signal. We develop two effective and low-complexity algorithms to address the joint PAPR and DPD optimization problem. Simulation results demonstrate that the proposed algorithms surpass existing approaches in terms of error vector magnitude (EVM), PAPR, and power spectral density (PSD).