Abstract: A novel side information transmission method for PAPR(peak-to-average power ratio) reduction in OFDM(orthogonal frequency division multiplexing) systems is presented, which can avoid the peak re-growth and the change of the structure of original OFDM signals which normally accompany the conventional methods. Simulation shows that the PAPR is reduced about 1.57dB with the new method for the CCDF(complementary cumulative density function) of 10^-3. At the same time, the accuracy of the side information can be ensured by repeating this certain OFDM symbol. Because the two same symbols have the maximal relativity, this characteristic can be used to achieve frame synchronization. Simulation result shows that the proposed scheme can prominently reduce the occurrence of peak re-growth brought by the conventional methods and help to achieve frame synchronization.

Key words: orthogonal frequency division multiplexing, peak-to-average power ratio, side information, maximum-likelihood