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The strong interference suffered by users can be a severe problem incache-enabled networks (CENs) due to the content-centric user associationmechanism. To tackle this issue, multi-antenna technology may be employed forinterference management. In this paper, we consider a user-centric interferencenulling (IN) scheme in two-tier multi-user multi-antenna CEN, with a hybridmost-popular and random caching policy at macro base stations (MBSs) and smallbase stations (SBSs) to provide file diversity. All the interfering SBSs withinthe IN range of a user are requested to suppress the interference at this userusing zero-forcing beamforming. Using stochastic geometry analysis techniques,we derive a tractable expression for the area spectral efficiency (ASE). Alower bound on the ASE is also obtained, with which we then consider ASEmaximization, by optimizing the caching policy and IN coefficient. To solve theresultant mixed integer programming problem, we design an alternatingoptimization algorithm to minimize the lower bound of the ASE. Our numericalresults demonstrate that the proposed caching policy yields performance that isclose to the optimum, and it outperforms several existing baselines.

Random Caching Design for Multi-User Multi-Antenna HetNets with Interference Nulling