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Iterative signal processing for mitigation of wideband ADC nonidealities in cognitive radio receiver

Large input signal dynamics is an essential problem in modern wideband communication receivers such as cognitive radios. If the receiver front-end and analog-to-digital interface cannot respond to varying conditions, a high amount of nonlinear distortion is caused due to the clipping. This paper proposes a robust digital signal processing method to iteratively remove unintentional clipping distortion in OFDM receivers. Using computer simulations it is shown that the symbol error ratio of a heavily clipped signal in a fading channel situation can be reduced practically to the level of an equivalent non-clipped signal. In other words, the proposed method can remove all the essential clipping distortion.