Assessing Power Amplifier Impairments and Digital Predistortion on Radar Waveforms for Spectral Coexistence
Augusto Aubry, Vincenzo Carotenuto, Antonio De Maio, Alfonso Farina, Alessio Izzo, Rosario Schiano Lo Moriello
Abstract
This article deals with the effects of power amplifiers (PAs) on radar waveforms designed to ensure spectral compatibility with other radio frequency wireless systems cohabitating in the same frequency band. To this end, a specific hardware-in-the-loop testbed composed of a personal computer, an arbitrary waveform generator, a nonlinear PA, and a signal analyzer is designed. It allows to gather measurements of the amplified signal and to grasp unwanted modifications of its spectral features due to the PA nonlinear distortion. Besides, it permits a quantitative assessment of the discrepancies between the nominal and the actual interference power injected by the radar in the shared frequency bandwidths. To alleviate the spectral distortions induced by the PA and improve spectral coexistence, the use of a digital predistortion (DPD) stage upstream the PA is investigated. Modeling techniques together with parameter inference are discussed and applied to the measured waveforms. The obtained experimental results highlight that pairing a suitable waveform design strategy with DPD processing represents a viable means to mitigate the PA distortions and to realize spectral coexistence.