PAPR Reduction in F-OFDM systems combining SLM and ICF

Abstract

Filtered-orthogonal frequency division multiplexing (F -OFDM) is a competitive candidate waveform for the fifth generation (5G) wireless communication systems due to its huge flexibility and high spectrum efficiency. Yet, F-OFDM inevitably brings the problem of high peak-to-average-power ratio (PAPR), not only reducing the efficiency of power amplifiers (PA), but also increasing the possibility of signal distortion. In this paper, to solve the high PAPR problem in F-OFDM systems, we propose a new hybrid PAPR reduction approach combining the traditional selected mapping (SLM) and iterative clipping and filtering (ICF) methods appropriately. First, SLM is used to decrease the probability that high PAPR values occur for separate subband signals. Then, we exploit I CF to perform clipping and filtering operations to reduce PAPR of the composite signal from the three subbands. Finally, we carry out simulations and results show that the proposed approach achieves lower PAPR than individual SLM and ICF methods, while there is almost no increase in bit error rate (BER) and system complexity.