Assessing Power Amplifier Impairments and Digital Predistortion on Radar Waveforms for Spectral Coexistence

Performance Analysis of Wireless Communications with Nonlinear Energy Harvesting under Hardware Impairment and κ-μ Shadowed Fading

“…Plugging F g (•) in ( 2) and f H (•) in ( 14) into (20) after elaborate manipulations, one simplifies Fw (v) as…”

“…In practice, hardware impairment (HWi), which may originate from an imperfect design process (viz. in-quadrature-phase imbalances and phase noises) or imperfect hardware elements (viz., amplifier nonlinearities), is present in transceivers [ 20 , 21 , 22 ]. HWi plays a role as an interference source and therefore, in degrading system performance significantly [ 23 ].…”

Compensating Power Amplifier Distortions on Radar Signals via Waveform Design

“…In general, the DPD can be seen as an "inverse" of the PA. The DPD algorithm needs to model the PA behavior accurately and efficiently for successful DPD deployment [7], [8].…”

“…To this end, in the first step a known input signal is given to the PA as input then the output is measured. Then with the known input and the measured output, the coefficients can be estimated by Least Square (LS) criterion [7], [8]. Let āq,m be the estimated MP coefficients of PA. We are interested in designing a waveform with good ISL of PA output (y).…”

“…In other words PAs should act as a wideband and linear system. However, the PAs contain non-idealities that can cause performance degradation of the systems they drive when deployed in the real world [7], [8]. Such distortions can significantly impair the system's expected performance, particularly in radar applications involving spectrum-sharing strategies to enable coexistence between radar and other telecommunication systems operating in the same frequency band.…”