正则化信道求逆预编码下的MIMO功率分配设计

A Power Allocation Scheme in Multiuser MIMO Downlink with Regularized Channel Inversion Precoding

本文考虑的是多天线的基站与多个单天线用户通信的多用户多输入多输出(MIMO)系统下行链路,主要研究问题是在该系统中的极大化和速率的优化问题。当基站采用的是Peel等人提出的正则化信道求逆预编码(RCI)技术的情况下,本文致力于寻找一种新的有效的功率分配策略来求解极大化和速率的优化问题。尽管该优化问题是一个高度非线性的非凸问题,但是本文基于合理地分析,在此基础上提出了一种在多用户MIMO下行链路中简单有效的功率分配方法。数值仿真结果显示相比于传统功率平均分配的RCI技术和迫零技术,本文提出的的功率分配方案的和速率显示出了更好的效果。

In this paper, an optimization problem for the sum rate maximization in multiuser multiple-input multiple-output(MIMO) downlink systems where a single base station equipped with multiple antennas communicates with multiple users each with a single antenna is investigated. With the regularized channel inversion(RCI) technique as the precoding strategy at the base station, we focus on finding a new and efficient power allocation strategy to maximize the sum rate. Although this programming problem is non-convex and highly nonlinear, based on analyzing reasonably, a simple and efficient method is proposed for the power allocation of the multiuser MIMO downlink. Simulation results show that the proposed scheme achieves better performance compared with the classical regularized channel inversion and Zero-forcing beamforming.