  The mitigation of nonlinear distortion caused by power amplifiers (PA) in
Orthogonal Frequency Division Multiplexing (OFDM) systems is an essential issue
to enable energy efficient operation. In this work we proposed a new algorithm
for receiver-based clipping estimation in OFDM systems that combines the
Iterative Hard Thresholding (IHT) method with a weighting corresponding to the
estimated probability of clipping. Thereby a more general amplifier
input-output characteristic is considered, which is assumed to be unknown at
the receiver side. Further, we avoid the use of dedicated subcarriers and
formulate the recovery problem solely on reliably detected sub-carriers.
Through simulations, we show that the proposed technique achieves a better
complexity-performance tradeoff compared to existing methods.
