Establishing Lower Bounds on the Peak-to-Average-Power Ratio in Filter Bank Multicarrier Systems

Abstract:
Filter bank multicarrier (FBMC) modulation is a promising candidate as the primary physical layer waveform in next generation wireless networks. However, FBMC, like other multicarrier schemes, suffer from high peak-to-average power ratio (PAPR). Due to inherent overlapping of the time domain FBMC symbols, the methods designed for PAPR reduction in orthogonal frequency division multiplexing (OFDM) can not be applied in a straightforward manner. In this paper, an optimization method is proposed to obtain significant PAPR reduction for short FBMC frames. The formulation of the optimization problem enables the use of both tone reservation and active constellation extension, which are well-known methods for OFDM systems. The results establish a practical lower bound on achievable PAPR with these two approaches.