Neighbourhood Detection-based ZF-V-BLAST Architecture for MIMO-FBMC-OQAM Systems

This paper investigates the zero forcing (ZF) based vertical Bell laboratories layered space-time (V-BLAST) detection in multiple input multiple output (MIMO) filter bank multicarrier (FBMC) systems based on the offset quadrature amplitude modulation (OQAM). Initially, a QR decomposition based convectional ZF-successive interference cancellation (C-ZF-SIC) technique is examined for the detection in MIMO-FBMC-OQAM systems. In order to tackle intense error propagation in the C-ZF-SIC scheme due to the intrinsic interference in FBMC systems, a neighbourhood detection based ZF-SIC (ND-ZF-SIC) technique is proposed that exploits the fact that each symbol in the FBMC-OQAM system interferes only with the symbols within a small neighbourhood. Further, the ND-ZF-SIC scheme based on the sorted QR decomposition (ND-ZF-SQRD) is also investigated for the detection in MIMO-FBMC-OQAM systems. Simulation results demonstrate that the proposed schemes significantly outperform the conventional scheme, and attain a performance similar to that of MIMO-OFDM systems.