Recovering the clipped OFDM signal based on the conic function

In orthogonal frequency division multiplexing (OFDM) systems, the peak to average power ratio (PAR) is much high. The clipping signal scheme is a useful method to reduce PAR. Clipping the OFDM signal, however, increases the overall noise level by introducing clipping noise. It is necessary to recover the figure of the original signal at receiver in order to reduce the clipping noise. Considering the continuity of the signal and the figure of the peak, we obtain a certain conic function curve to replace the clipped signal module within the clipping time. The results of simulation show that the proposed scheme can reduce the systems' BER (bit-error rate) 10 times when signal-to-interference-and noise-ratio (SINR) equals to 12 dB. And the BER performance of the proposed scheme is superior to that of Kim's scheme, too.