PAPR reduction for real baseband OFDM signals

When applying the existing partial transmit sequences (PTS) schemes directly to real-valued systems, one may encounter a difficulty in constructing phase sequences sets with conjugate symmetry. To overcome this difficulty, two PTS schemes, the adjacent partition (AP-PTS) and the interleaved partition (IP-PTS), are proposed in this paper. For the AP-PTS, the difficulty is circumvented by rearranging the data sequence, while for the IP-PTS, constructing phase sequences sets is avoided by generating the real-valued OFDM candidate signals in the time domain directly. The performances of the two schemes are evaluated via simulations. The results show that both schemes can effectively reduce the PAPR of a real-valued OFDM system