A generalized subcarrier-grouped MMSE based multi-stage interference cancellation scheme for OFDMA uplink systems with CFOs

In this paper, we propose a low-complexity interference cancellation (IC) scheme for OFDMA uplink systems with CFOs. The proposed scheme employs a multi-stage structure, in which a subcarrier-grouped MMSE scheme is used in each stage. To make the proposed scheme more flexible to the tradeoff between the performance and the complexity, we generalize the subcarrier-grouped MMSE scheme and employ a novel IC strategy. The simulation results show that the proposed IC scheme outperforms other existing schemes with considerable low complexity.