Throughput analysis based on antenna downtilt design in coordinated multi-cell 3D MIMO system

摘要

The explosive increase of mobile traffic due to the popularity of mobile devices demands higher throughput for future wireless communications. Three-dimension multiple-input multiple-output (3D MIMO) is one of the commonly accepted techniques to improve cell average throughput by designing an appropriate antenna downtilt benefiting from the freedom of vertical dimension. In this paper, we provide an analytical expression of cell average throughput in downlink coordinated 3D MIMO system for the first time, by incorporating coordination among multi-cell. Secondly, in order to maximize cell average throughput, we utilize genetic algorithm (GA), together with cell splitting to get both the inner and outer sector beam downtilts under the quality of service (QoS) constraint. Finally, simulation results show that the proposed method effectively improves cell average throughput compared with non-coordinated 3D MIMO system.