大规模MIMO系统的预编码算法综述

相比于传统多输入多输出（MIMO）系统，大规模MIMO的天线数量大幅增加，使得系统的容量提升、误比特率下降，但也造成预编码矩阵维度升高，算法复杂度、系统成本及实现难度增大。将大规模MIMO系统主要采用的预编码技术分为线性和非线性两个部分，对两者进行了归纳和对比，并着重介绍了几种经过简化的线性预编码算法和几种比较典型的非线性预编码算法，指出因为非线性算法的复杂度很高，故未来大规模MIMO系统的预编码应当以线性算法为主。

An overview of massive MIMO precoding algorithms

In comparison with traditional multiple-input multiple-output(MIMO) systems,the number of antennas of massive MIMO increases significantly,which improves the system capacity and reduces the bit error rate(BER) but causes high precoding matrix dimension,precoding algorithm complexity,system cost and implementation difficulty. This paper classifies precoding technologies used in massive MIMO systems to two types,linear algorithms and nonlinear algorithms,summarizes and compares them with focuses on several simplified linear precoding algorithms and several typical nonlinear precoding algorithms.Finally,it points out that because of the high complexity of nonlinear algorithm,the future massive MIMO system should be based on linear precoding algorithms.