基于SLNR的MU-MIMO系统预编码和用户调度算法研究

Research on precoding and user scheduling algorithm for MU-MIMO system based on SLNR

在MU-MIMO通信系统中,允许多个用户在相同的频率和时隙上进行通信,可以有效增大系统吞吐量、提高系统性能,如何设计高效的预编码方案和用户调度方案以减少用户间的干扰是MU-MIMO系统面临的主要问题之一。本文首先利用最小均方误差方法的改进信道矩阵来有效减少估计信道误差的影响,提出了一种基于信漏噪比(SLNR)的MU-MIMO系统预编码方案;在此基础上,针对传统的贪婪用户调度算法复杂度过高的特点,提出一种基于SLNR准则的低复杂度的用户调度方案。通过仿真分析,提出的预编码方案能够有效降低系统误码率,用户调度方案有效降低了算法计算复杂度。

In the MU-MIMO communication system,the throughput and the performance can be effectively improved by allowing multiple users to communicate on the same frequency and time slot.How to design efficient precoding scheme and user scheduling scheme to reduce interference between users is one of the main problems faced by MU-MIMO system.In this paper,an improved channel matrix based on the minimum mean square error method is used to effectively reduce the impact of estimation error,and then a precoding scheme for MU-MIMO system based on Signal to Leakage and Noise Ratio(SLNR)is proposed.On this basis,aiming at the high complexity of traditional greedy user scheduling algorithm,a user scheduling scheme based on SLNR criterion is proposed.Through simulation analysis,the proposed precoding scheme can effectively reduce the bit error rate of the system,and the user scheduling scheme can effectively reduce the computational complexity of the algorithm.