A new CP-based non-overlapping FBMC-QAM system for future wireless communications

A new cyclic prefix (CP)-based non-overlapping FBMC-QAM (CP-NO-FBMC-QAM) system with two prototype filters is proposed in this paper, which satisfies complex orthogonality conditions and good frequency energy confinement at the same time. We analyze its inter-carrier interference/inter-symbol interference (ICI/ISI) over multipath channels. Owing to the additional CP, the ISI of received symbols over multipath channels is eliminated in the proposed system, and the resulting improvement in the signal-to-interference ratio (SIR) performance is evaluated by theoretical analysis. Moreover, for the ICI caused by multipath propagation in received symbols, we develop a method that eliminates the ICI by frequency-domain channel estimation and equalization before the receiver filtering process. The proposed CP-NO-FBMC-QAM system and ICI cancellation method (ICICM) are validated by comparisons of implementation complexity, power spectral density (PSD), bit error rate (BER) and channel estimation performance with conventional CP-based orthogonal frequency division multiplexing (CP-OFDM) and FBMC-QaM systems.