Sliding Window Tone Reservation using smart gradient projection method for PAPR reduction of FBMC signals

The Filter Bank Multicarrier (FBMC) modulation scheme has recently seen renewed interest and is being considered as a viable alternative to orthogonal frequency division multiplexing (OFDM). FBMC however suffers from the same high peak-to-average power ratio (PAPR) drawback as OFDM systems. Conventional OFDM PAPR reduction techniques cannot be directly applied to FBMC due to the overlapping nature of FBMC symbols. A novel technique is proposed to limit the peak factor of a multicarrier signal based on Sliding Window Tone Reservation. The peak-reducing signal is forced to have the constraints of SW-TR, so that when added to the original signal, the peak factor is reduced without increasing the BER and the out-of-band radiation. The proposed method has low computational complexity requirements and is fastconverging. Simulation results show that, the proposed technique outperforms a conventional FBMC SW-TR method by 1.6 dB in PAPR reduction at a clip probability of 10⁻³ on the 2nd iteration.