A low-complexity selected mapping scheme for peak-to-average power ratio reduction in OFDM systems

One major problem associated with orthogonal frequency division multiplexing is the high peak-to-average power ratio (PAPR) of the output signal. The selected mapping (SLM) approach provides good performance for PAPR reduction, but it may suffer from the high computational complexity of a bank of inverse fast Fourier transforms (IFFTs). We propose a kind of low-complexity conversion to replace the IFFTs in the SLM method. Using the proposed conversions, we develop a novel SLM scheme with much lower complexity than the conventional SLM approach. Computer simulation results show that both of the SLM schemes have almost the same PAPR reduction performance.