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大规模天线阵列的应用是5G技术中提高频谱效率的有效手段.在大规模天线阵列系统中,天线单元的数量显著增长.这些天线单元可以与不同数量的无线射频通道连接,从而映射到多个天线端口上.由于大量的天线单元可以组成不同形状的天线阵列,设计单一的反馈框架来支持不同形态的大规模天线阵列具有很大的挑战性.本文分析了在大规模天线阵列系统中实现多个维度预编码的方法,通过在水平维和垂直维分别进行预编码,充分利用了所有天线单元的天线增益和赋形增益,且所给方法只需要借助目前广泛应用于2D天线阵列的反馈机制.从我们的仿真中可以看出:基于CSI-RS赋形的CSI反馈和相应的预编码算法,相对于传统MIMO处理方式,能够获得显著的性能增益.而且,这种方法只需要一些基站侧的实现,对终端可以是完全透明的,因此对终端的影响很小.
The application of large-scale antenna arrays is an effective means to improve the spectral efficiency in 5G technology.In a large-scale antenna array system, the number of antenna units significantly increases.These antenna units can be connected with different numbers of radio frequency channels to map to multiple Antenna port.As a large number of antenna elements can form antenna arrays of different shapes, it is very challenging to design a single feedback frame to support different patterns of large-scale antenna arrays.This paper analyzes the implementation of large-scale antenna array system Dimensional precoding method, the antenna gain and the shaping gain of all the antenna elements are fully utilized by pre-encoding in the horizontal dimension and the vertical dimension, respectively, and the given method only needs the feedback mechanism widely used in the 2D antenna array. It can be seen from our simulation that the CSI feedback based on CSI-RS and the corresponding precoding algorithm can obtain significant performance gain compared with the traditional MIMO processing method. Moreover, this method only needs some base station side Implementation, the terminal can be completely transparent, so the impact on the terminal is small.