Overlapped Smart Gradient Projection Tone Reservation PAPR reduction for FBMC/OQAM signals

The Filter Bank Multicarrier based on Offset Quadrature Amplitude Modulation (FBMC-OQAM) system is now a recognized alternative to the conventional OFDM system. However, the FBMC/OQAM system also suffers from the high peak-to-average power ratio (PAPR) problem that is inherent to the multicarrier modulations (MCM). In this paper, we propose overlapped Smart Gradient Projection Tone Reservation (OSGP-TR) method to reduce the PAPR of the FBMC/OQAM signals. Since adjacent data blocks in the time domain overlap with each other due to the introduction of the filter bank, the OSGP-TR method scales the filtered clipping noise to generate the peak-canceling signal, and all the influences of the associated overlaps are taken into account when computing the scaling factors. The proposed FBMC OSGP-TR method outperforms a conventional SW-TR (Sliding Window Tone Reservation) method by 2.6dB in PAPR reduction at a clip probability of 10-3 on the 1st iteration.