Improving the clipped OFDM performance by using 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, but using this scheme, the subcarriers´ orthogonality is destroyed. In order to weaken the effect of clipping scheme to systems´ performance, the conic function scheme is proposed to retrieve the clipped signal. Considering the continuity of signal and the finger of the peak, we obtain a certain conic function curve as the retrieved signal´s module within the clipped time. The results of simulation show that the proposed scheme can reduce the systems´ BER 10 times compared to the traditional scheme when signal-to-interference-and noise-ratio (SINR) equals to 12dB. And the performance of the proposed scheme is superior to already existent schemes, too.