A Novel Piecewise Nonlinear Companding Transform for PAPR Reduction in GFDM

Similar to the widely used orthogonal frequency division multiplexing (OFDM) scheme, Generalized Frequency Division Multiplexing (GFDM) system suffers from the problem of the high peak-to-average power ratio (PAPR). In this paper, we propose an efficient piecewise nonlinear companding transform for PAPR reduction of GFDM signals and a novel iterative receiver of GFDM to improve the bit error rate (BER) performance. By carefully adjusting transform parameters and the number of iterations of the receiver, more flexibility in the companding form and a better trade-off between PAPR reduction and BER performance can be achieved to satisfy various system requirements. Compared with existing PAPR reduction schemes in GFDM, simulation results show that the proposed technique can substantially offer the better performance of GFDM system in terms of PAPR reduction and BER performance.