Partitioned-SLM Scheme with Low Complexity for PAPR Reduction of OFDM Signals

In this paper, we propose P-SLM (partitioned-selective mapping) scheme with low complexity for PAPR (peak-to-average power ratio) reduction of OFDM (orthogonal frequency division multiplexing) signals. In the proposed scheme, a symbol sequence in frequency domain is partitioned into several sub-blocks, and each sub-block is multiplied by different phase sequences whose length and number are shorter and smaller than those used in the conventional SLM. Then, among statistically independent sequences in time domain generated after the IFFT (inverse fast Fourier transform) for the phase rotated sub-blocks, the sub-block combination with the lowest PAPR is selected and transmitted. Simulation results reveal that the proposed P-SLM scheme can remarkably reduce the number of IFFT calculation and multiplication than the conventional SLM without loss of PAPR reduction performance