Efficient SLM Technique for PAPR Reduction in UFMC Systems

Universal filtered multicarrier (UFMC) is a promising candidate waveform for 5G systems. UFMC is an alternative candidate waveform to orthogonal frequency division multiplexing (OFDM), in which the filtering operation is performed for subband of subcarriers instead of the whole band. The subband filtering process reduces-of-band (OOB) emission and therefore minimizes the intercarrier interference (ICI) between adjacent users. However, UFMC system is limited by its high peak-to-average power ratio (PAPR). So in this paper, we first analyze the differences in PAPR between the UFMC and OFDM waveforms. Second, we propose an efficient selected mapping (SLM) technique for PAPR reduction in UFMC systems. The proposed technique achieves significant PAPR reduction as compared with the conventional SLM-OFDM system and single carrier frequency division multiple access (SC-FDMA) system. Also, the proposed technique performs very well in terms of bit error rate (BER) for the UFMC system.