PAPR Reduction in FBMC systems using phase realignment based techniques

Recently, filter bank multicarrier (FBMC) has been given a huge interest as an alternative to orthogonal frequency division multiplexing (OFDM). FBMC scheme has increased frequency efficiency and low out-of-band (OOB) emission as compared with OFDM. However, FBMC still suffers from a high peak-to-average power ratio (PAPR) as in OFDM systems. Several OFDM based PAPR reduction techniques have been adopted for FBMC system. In this paper, novel techniques for PAPR reduction for FBMC systems are proposed based on the evolution of the phase realignment (PR) and modified PR (MPR) techniques used for OFDM systems. The proposed PAPR reduction techniques are designed to improve the PAPR performance at the cost of minimal degradation of the bit error rate (BER) performances, defined by a transmit error vector magnitude (EVM). Unlike other existing techniques, the proposed techniques reduce the average power of the FBMC symbols, which help to retain low BER per unit energy. Simulation results show the proposed techniques as the potential alternative for PAPR reduction in FBMC systems.