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The mitigation of nonlinear distortion caused by power amplifiers (PA) inOrthogonal Frequency Division Multiplexing (OFDM) systems is an essential issueto enable energy efficient operation. In this work we proposed a new algorithmfor receiver-based clipping estimation in OFDM systems that combines theIterative Hard Thresholding (IHT) method with a weighting corresponding to theestimated probability of clipping. Thereby a more general amplifierinput-output characteristic is considered, which is assumed to be unknown atthe receiver side. Further, we avoid the use of dedicated subcarriers andformulate the recovery problem solely on reliably detected sub-carriers.Through simulations, we show that the proposed technique achieves a bettercomplexity-performance tradeoff compared to existing methods.

Compensation of Amplifier Distortion for OFDM signals based on Iterative Hard Thresholding