Advanced digital predistortion algorithms linearizing power amplifiers under high peak-to-average power ratio (PAPR) multi-carrier waveforms.
Multi-carrier OFDM and OTFS signals feature PAPR exceeding 10 dB. Operating power amplifiers near saturation causes non-linear intermodulation distortion that degrades communication bit-error-rates and injects ghost targets into radar range profiles.
ISACRF implements deep neural and Volterra-series DPD models running on FPGA basebands. Predistortion compensates for dynamic thermal and memory effects, suppressing adjacent channel leakage ratios (ACLR) below -45 dBc.