Combating Inter-cell Interference in 802.11ac-based Multi-user MIMO Networks
In an 802.11ac-based MU-MIMO network comprised of multiple cells, inter-cell interference allows only a single AP to serve its clients at the same time, significantly limiting the network capacity. In this paper, the authors overcome this limitation by letting the APs and clients in interfering cells coordinately cancel the inter-cell interference using their antennas for beam-forming. To achieve such coordinated interference cancellation in a practical way, they propose a novel two-step optimization. First, without requiring any channel knowledge, each AP and client optimizes the use of its antennas for either data communication or inter-cell interference cancellation, in order to maximize the total number of deliverable streams in the MU-MIMO network.