A Novel GAMP-based Receiver for Nonlinearly Distorded Precoded OFDM Signals

We address the post-compensation of nonlinear distortion in precoded orthogonal frequency division multiplexing signals caused by power amplifier impairments. An iterative message-passing receiver is proposed, using generalized approximate message passing to perform OFDM demodulation and nonlinearity compensation, while deriving new messages towards the equalizer to establish a turbo-equalization scheme. Additionally, the complex integral required for GAMP is simplified, reducing it to a one-dimensional integral that can be computed numerically. The proposed receiver significantly outperforms previous GAMP-based distortion compensation techniques.

A Novel GAMP-based Receiver for Nonlinearly Distorded Precoded OFDM Signals

Hugo Parmentier, Centrale-Supelec; Frederic Lehmann, Telecom SudParis; BERTHET Antoine O., CentraleSupélec, Université Paris-Saclay