Nonlinear Amplifier Amplitude Modulation Distortion Mitigation Techniques

Abstract

High peak-to-average power ratio (PAPR) waveforms present a challenge to radar systems in which high power amplifiers operate in saturation to increase power efficiency. Previous works have demonstrated a marked reduction in PAPR by leveraging digital arrays, namely, utilizing the spatial complement of a set of steering vectors to not interfere with RF functions. The previous work was extended by first using waveform spectral orthogonal complements to reduce PAPR, then fur- ther generalizing to n dimensional orthogonal subspace utilization, including using all avaiable degrees of freedom (time, azimuth, elevation, etc.) simultaneously or sequentially to reduce the impact in any one dimension.