Real-domain SIC for MIMO with FBMC waveforms

Abstract

This paper proposes 2×2 MIMO OQAM/FBMC receiver strategy based on successive interference cancellation (SIC) as an extension of the SISO approach which uses entirely real-valued formulation of the transmission system model]. Both increase of throughput and SNR gain are observed through appropriate maximum ratio combining (MRC) of the soft symbols pertaining to the receiver-end diversity branches. The 2×1 multi-user detection (MUD) case has been also addressed to certain extent. Additional gains, essentially related to SISO case, coming from the cooperative use of in-phase (I) and quadrature (Q) branches, primarily based on the quadrature noise components' independence, as well as from the explicit noise cancellation within the SIC framework, have also been outlined.