Analysis and optimization of distributed antenna-aided heterogeneous networks relying on fractional frequency reuse

In distributed antenna-aided Heterogeneous Networks, macro cells (MCs) always suffer co-channel interference (CCI) from femtocells (FCs). Hence, in this paper, the downlink (DL) signal to interference ratio (SIR) of MCs and the interferential constituents are investigated. To decrease this adverse impact of FCs and achieve high spectral efficiency, a joint optimization of Particle Swarm Optimization (PSO) and optimal frequency allocation (OFA)among mobile stations (MSs) is proposed to improve both the cell planning and the frequency allocation. Simulation results show high feasibility of PSO algorithm and prove that compared with conventional static system and PSO scheme, the proposed PSO-OFA joint optimizing scheme has significant performance improvement and also achieve some degree of controllability.