A low-complexity symbol interleaving-based PAPR reduction scheme for OFDM systems

The symbol interleaving scheme is one of the peak-to-average power ratio (PAPR) reduction schemes for the orthogonal frequency division multiplexing (OFDM) system. Compared with the selected mapping (SLM) and the partial transmit sequence (PTS) schemes, it does not require any extra complex multiplications to generate candidate signals aside from the complex multiplications of inverse fast Fourier transform (IFFT) operations. However, the interleaving scheme still has high computational complexity since it also requires a bank of IFFT operations. In this paper, two time-domain properties of IFFT operations are used to construct the proposed low-complexity PAPR reduction scheme. Simulation results show that the complementary cumulative distribution function (CCDF) of the proposed scheme is close to that of the traditional interleaving scheme when the given threshold γ <; 7.2 dB and N = 256 subcarriers. The CCDF of the proposed scheme is lower than that of the traditional interleaving scheme when γ ≥ 7.2 dB and N = 256 subcarriers.