Analysis and Optimization of Inter-tier Interference Coordination in Downlink Multi-Antenna HetNets with Offloading
Yueping Wu, Ying Cui, Bruno Clerckx

TL;DR
This paper proposes an interference nulling scheme in multi-antenna HetNets to improve offloaded user performance by managing inter-tier interference, deriving optimal parameters and comparing with existing schemes.
Contribution
It introduces a stochastic geometry-based analysis of interference nulling in HetNets and identifies optimal degrees of freedom for interference management.
Findings
IN scheme outperforms simple offloading and ABS schemes
Performance gains are significant in large antenna regimes
Analytical expressions enable optimal interference management design
Abstract
Heterogeneous networks (HetNets) with offloading is considered as an effective way to meet the high data rate demand of future wireless service. However, the offloaded users suffer from strong inter-tier interference, which reduces the benefits of offloading and is one of the main limiting factors of the system performance. In this paper, we investigate an interference nulling (IN) scheme in improving the system performance by carefully managing the inter-tier interference to the offloaded users in downlink two-tier HetNets with multi-antenna base stations. Utilizing tools from stochastic geometry, we first derive a tractable expression for the rate coverage probability of the IN scheme. Then, by studying its order, we obtain the optimal design parameter, i.e., the degrees of freedom that can be used for IN, to maximize the rate coverage probability. Finally, we analyze the rate…
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Taxonomy
TopicsAdvanced MIMO Systems Optimization · Energy Harvesting in Wireless Networks · Antenna Design and Analysis
