Low complexity SLM technique with an interleaver-Butterfly ensemble for PAPR reduction of power limited OFDM system

Selected mapping (SLM) is considered as a practical probabilistic PAPR reduction method for OFDM systems. A problem of this technique is its high computational complexity due to multiple inverse Fourier transform. We suggest a decimation in frequency IFFT scheme together with an interleaver-butterfly ensemble to generate multiple candidates. Orthogonality in the frequency domain is kept and better PAPR reduction performance is achieved without additional complex multiplication. Moreover, we obtain a better error rate over both the AWGN channel and the frequency selective fading channel.