A low-complexity peak-to-average power ratio reduction technique for OFDM systems

One major drawback of orthogonal frequency division multiplexing is the high peak-to-average power ratio (PAPR). The selective mapping (SLM) approach provides good performance for PAPR reduction, but it may suffer from the high computational complexity of the bank of inverse fast Fourier transforms (IFFTs). We propose two low-complexity conversions to replace half of the IFFTs in the SLM method. Computer simulation results and complexity analyses show that, with the two proposed conversions, we can reduce about half of the computational complexity of the SLM approach and get better performance for PAPR reduction.