A reduced-complexity PTS scheme for peak-to-average power ratio reduction in OFDM systems

In this paper a reduced-complexity partial transmit sequences (PTS) approach is proposed for the reduction of peak-to-average power ratio (PAPR) in OFDM systems. In the PTS scheme, we need several IFFTs (inverse fast Fourier transforms) to compute the partial transmit sequences. There are two main contributions in the paper. Firstly, we propose to partition the input symbols into disjoint subblocks in an interleaving manner. In this way, we can significantly reduce the complexity by sharing the arithmetic in the IFFT computations. Secondly, we show that in the new partition scheme, the number of rotation factors can be reduced by one without affecting the PAPR reduction ability. As a result, the search time for the optimal rotation factor can be reduced by 75%. Simulation results show that the PAPR of the proposed method is only slightly worse than the original PTS scheme but it has a much lower complexity.