Prototype Filter Design in GFDM Systems in Presence of PA Nonlinearity

Generalized frequency division multiplexing (GFDM) is a flexible multicarrier waveform that features low out-of-band emission (OOBE) with a prototype transmit filter serving as design freedom. However, in the presence of power amplifier (PA) nonlinearity, the effect of spectral regrowth may deteriorate the expected low OOBE property, and possibly make the transmission violating the requirement of a spectrum emission mask (SEM). In this paper, a prototype transmit filter design method along with an idea of spectral regrowth prediction (SRP) is proposed for GFDM. The resulting OOBE can meet any given SEM with maximal spectral resource utilization in the GFDM system. Simulation results reveal the advantages of adopting the proposed scheme in spectral regrowth mitigation and resistance to PA nonlinear distortion.