基于能效的多用户Massive MIMO天线选择技术研究

Energy Efficiency-based Antenna Selection in Multi-user Massive MIMO System

在Massive MIMO通信系统中,合理地对基站天线进行选择,能在保持系统优点的同时降低实现复杂度和硬件成本,而传统的天线选择算法多适用于固定天线数的场景且复杂度较高。针对多用户Massive MIMO系统下行链路场景,以系统能效为优化目标,提出了一种基于交替搜索的相关性天线选择方案。该方案在相关性天线选择基础上,首先考虑最大增益天线与其他天线间的相关性,然后利用递增递减选择思想,分别建立空集和全集进行交替搜索,更新天线选择子集,从而达到所需的能效指标。仿真结果表明,在相同条件下,所提方案能够有效提高系统能效,在灵活应对不同天线数需求的同时具有较低的复杂度,为多用户Massive MIMO系统的天线选择提供了一种十分有效的解决方案。

Reasonable antenna selection can retain the advantages of Massive MIMO system and reduce the implementation complexity and hardware cost.However,the traditional antenna selection algorithms with higher computational complexity are typically suitable for a fixed number of antennas.With energy efficiency as optimization objective and for the down-link scene of multi-user massive MIMO system,the correlated antenna selection based on bidirectional search is proposed.Based on correlation antenna selection,the correlation of between maximum gain antenna and other antennas is considered firstly,and then the bidirectional search based on incremental and detrimental selection is constructed by using increasing-and-decreasing selection idea,thus to update antenna selection subsets and achieve the required energy efficiency indicators.Simulation results indicate that the proposed schemes could,under the same condition,effectively improve the system energy efficiency,flexibly meet the demand for the different antenna numbers and maintain a lower computational complexity.This algorithm could provide an effective solution to the antenna selection of multiuser Massive MIMO systems.