Transceiver design for fast-convolution multicarrier systems in multipath fading channels

Abstract

One of the biggest challenges of 5G comes from sporadic traffic generated by millions of devices in highly fragmented spectrum, especially for uplink transmission. Current physical layer based on synchronism and orthogonality become low-efficient and inflexible because of the sophisticated algorithms it used to maintain synchronism. Asynchronous waveform with ultra-low side lobe seems promising, and Fast-Convolution Multicarrier (FCMC) is among the most competitive waveforms. In this paper, we investigate transceiver design for FCMC scheme in multipath fading channels. Firstly, we derive the signal model of FCMC transceiver. Based on the signal model, we develop the low-complexity one-tap minimum mean square error (MMSE) frequency-domain equalizer exploiting the asymptotic behavior of Toeplitz matrices and the nature of fast-convolution. The new proposed FCMC transceiver can be applied in single-carrier frequency-division multiple access transmission. The resulting scheme features low Peak-to-Average-Power-Ratio (PAPR), flexible user bandwidth, and allowing asynchronous transmission. Simulation results confirm the advantages of the proposed scheme.