Compensating Power Amplifier Distortions on Radar Signals via Waveform Design

Abstract

This paper aims to study the distortion effect of Power Amplifiers (PAs) on radar waveforms in terms of Integrated Sidelobe Level in Single Input and Single Output (SISO) radar systems. To this end, we consider Memory Polynomial (MP) model as behavior of the PA which considers both non-linearity and memory distortions. Then, we consider minimizing the auto-correlation of the PA output in the baseband as a design metric for compensating the distortion effect of the PA. In this regard, we proposed an algorithm based on Coordinate Descent (CD) method to design an M-ary Phase Shift Keying (MPSK) waveform, which is a discrete phase waveform. Finally, in the numerical results, we evaluate the performance of the proposed method and compare it with Digital Predistortion (DPD) method as a conventional approach for compensating the distortion effect of PA.