A Novel FBMC/QAM Scheme to Eliminate the Error Floor in Multipath Channels

To eliminate the error floor of filter bank multicarrier with quadrature amplitude modulation (FBMC/QAM) in multipath fading channels, a novel cyclic prefix–based FBMC/QAM (CP-FBMC/QAM) scheme is proposed in this paper. The proposed CP-FBMC/QAM scheme only requires simple single-tap channel equalization to compensate for the influence of multipath channels. Moreover, we formulate a prototype filter optimization problem by minimising the interference powers subject to the spectrum localization constraints and derive prototype filters with good spectrum confinement for CP-FBMC/QAM. The proposed prototype filters can eliminate the impact of CP insertion on the spectrum confinement. Simulation results confirm the effectiveness of CP-FBMC/QAM in terms of spectrum confinement and bit error rate performance.