Interference mitigation via successive cancellation in heterogeneous networks

In this paper, we present practical interference management schemes in heterogeneous networks (HetNets) based on interference decoding and cancellation at the receivers. The underlying idea is based on Han-Kobayashi type message splitting (MS) technique [3]. We develop relatively low-complexity precoders that facilitate interference mitigation and maximize sum-throughput in the network. System-level simulation results for a general HetNet system are presented. It is shown that the proposed MS design along with interference coordination among the cells provides up to 57% cell average throughput gain compared with the rank-1 coordinated beamforming (CBF) scheme. The design also provides substantial throughput gain in particular for Macro cells compared with rank-adaptive CBF transmission.