Peak-to-average Power Ratio Reduction for Pulse-Shaping OFDM Systems

High peak-to-average power ratio (PAPR) is a major drawback of the pulse-shaping orthogonal frequency division (PS-OFDM) system (mainly refers to Gabor systems in this paper). Due to the overlapped signal structure, it is considered that conventional PAPR reduction schemes intended for rectangular window based OFDM will not be very effective if directly employed in PS-OFDM system. However, in this paper, by making use of the finite length of prototype filters and dividing the PS-OFDM systems into IFFT and filter parts, we propose to employing conventional PAPR reduction schemes directly in PS-OFDM systems before filtering operations. Different with other PAPR reduction techniques, the proposed scheme preserves the localization and orthogonality of the prototype filters and achieves a desirable PAPR reduction of PS-OFDM system at the same time.