Performance analysis of 5G heterogeneous networks under the impact of aggregate interference over Nakagami-m fading channels

Heterogeneous networks (HetNets), which consist of ultra-dense femtocell networks underlaid by traditional homogenous macrocell networks, are a promising option for the exceedingly high data rate demands of upcoming 5G communications. The densely deployed femtocells in cochannel mode cause severe interference because of the short distances between cochannel cells, which is the main challenge for femtocell deployment in HetNets. The HetNets are modeled based on stochastic geometry, which is assumed to distribute the interfering nodes as a point process. Specifically, in this article, a homogeneous Poisson point process is used to model the random distribution of macrocell users and femtocell base stations. Based on the complementary cumulative distribution function of the received signal to interference ratio at the macrocell base stations and femtocells, closed-form expressions are derived for the outage probability. Further, closed-form expressions are derived for the network throughput and energy efficiency of femtocells. Finally, theoretical and simulation results are discussed for the derived expressions under different system parameters.