A Precoding-based PAPR Reduction Technique for UF-OFDM and Filtered-OFDM Modulations in 5G Systems

International audienceThe universal filtered-orthogonal frequency divisionmultiplexing (UF-OFDM) (also called universal filtered multicar-rier (UFMC)) and the filtered-OFDM (F-OFDM) are candidatesto be alternative to the OFDM modulation in the upcoming5G systems thanks to their improved spectral occupation andresistance to the carrier frequency offset. However, like themajority of the multicarrier modulations, UF-OFDM and F-OFDM have a high peak-to-average power ratio (PAPR). Thisinfluences the operation mode of radio frequency componentssuch as the power amplifier and the digital-to-analog converter.In this paper, a precoding-based PAPR reduction technique isproposed for both the UF-OFDM and the F-OFDM cases. Asimilar technique has been proposed in the literature for OFDM.The principle of this method is to transform the UF-OFDM signalto a lower order summation of single carrier signals and theF-OFDM signal to single carrier signal. The relevance of theproposed PAPR reduction technique is confirmed by simulationresults. The latter show a PAPR reduction of at least 2.5 dB.Moreover, the proposed technique does not impact the bit errorrate performance and lowers down the power spectral densitytails at the power amplifier output