  Nonlinear distortion in power amplifiers (PA) can significantly degrade
performance of orthogonal frequency division multiplexed (OFDM) communication
systems. This paper presents a joint maximum-likelihood channel frequency
response and nonlinear PA model estimator for OFDM signals. Derivation of the
estimator is based on Taylor-series representation of power amplifier
nonlinearity and is suitable for wide range of memoryless PA models. A
sub-optimal decision-aided algorithm for adaptive compensation of nonlinear
distortion effects at the receiver-side is also presented. It is shown that the
proposed algorithms can be used in IEEE 802.11a/g/p/ac compliant wireless LAN
receivers without any modifications at the transmitter side. The performance of
the proposed algorithms is studied by means of computer simulation.
