Performance analysis of MIMO in two-tier LTE network

Femtocell technology becomes an important way of the supplementary coverage of the LTE cellular mobile communication network for its better hotspot coverage,the higher transmission rate and the larger network capacity.However,it also brought about the complicated CCI in the networks at the same time,and this seriously affected the performance of heterogeneous networks.In order to reduce the CCI and improve the capacity in the LTE hierarchical networks,used eigen beamforming,orthogonal space-time block code and antenna selection technology in the two-tier network,gave the accurate mathematical expression of the no-coverage Femtocell radius,Femtocell optimal density and macrocell coverage radius,and analyzed the improved effect of the interference suppression.The simulation shows that,compared to SISO,it is most beneficial for interference suppression about eigen beamforming,and it can greatly improve the network proformance,antance selection have a second effect,OSTBC bring the smallest performance gain.However,when taking into account the network gain and the complexity on the whole,the selection diversity is the better choice.