A Hybrid Interference Cancellation Scheme for Massive MIMO Heterogeneous Networks

For co-channel deployed massive multiple input multiple output (mMIMO) heterogeneous networks (HetNet), serious performance degradation will be caused by various types of interferences, such as the inter-tier and intra-tier interferences. Tremendous efforts have focused on the interference management (IM) for HetNet. Nevertheless, for different network configurations' e.g., different deployments of small cell (SC) base stations (BSs) and users, different number of SC BSs and users, etc., the performances of different IM schemes may vary. The current fixed only one or two types of IM schemes can not guarantee the optimal performance for different scenarios of mMIMO HetNet. Therefore, a hybrid IM schemes is proposed here. We formulate the determination of IM schemes as an optimization problem for maximizing the overall data rate, which is solved by the D.C. (difference of two convex functions) program. Numerical results show the significant performance enhancement compared with the fixed IM schemes. Moreover, it is found that, for large coverage of SC case, nearly maximum system performance in practical scenario can be achieved with not so large number of antennas at macro-cell BS.