基于用户分类的混合预编码和功率分配联合算法  

Combined algorithm of hybrid precoding and power allocation based on user classification

作　　者：肖琨[1] 欧阳达 XIAO Kun;OUYANG Da(School of Electronic and Information Engineering,Guangxi Normal University,Guilin 541004,Guangxi China)

机构地区：[1]广西师范大学电子与信息工程学院,广西桂林541004

出　　处：《华中科技大学学报(自然科学版)》2025年第3期93-98,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61861006)。

摘　　要：针对下行多小区多输入多输出(MIMO)通信系统中小区中心区域和边缘区域的信道条件差异,将小区用户分为中心用户和边缘用户两类,提出了一种基于用户分类的混合预编码和功率分配联合算法.首先建立了包含多个小区、多个中心用户和多个边缘用户的下行多小区MIMO系统模型,在此基础上形成了以最大化系统能效为目标的预编码和功率分配联合优化问题,并进一步分解为中心用户预编码、边缘用户预编码和功率分配子问题.在预编码设计时,根据不同预编码的特点将中心用户采取最大化信漏噪比预编码,边缘用户采取最小均方差预编码,求解得到了各自的最优解.在功率分配设计时,通过拉格郎日乘子算法得到封闭形式下的最优功率分配矩阵.仿真结果表明:所提算法在误码率和能量效率方面均优于对比文献算法,有效提升了系统的整体性能.According to the channel condition difference between the center area and the edge area in downlink multi-cell multiple input multiple output(MIMO) communication system,the cell users were divided into the center users and the edge users,and a combined algorithm of hybrid precoding and power allocation based on user classification was proposed.Firstly,a downlink MIMO system model with multiple cells,multiple central users and multiple edge users was established.On this basis,a joint optimization problem of precoding and power distribution aiming at maximizing system energy efficiency was formed,and further decomposed into central user precoding,edge user precoding and power allocation sub-problems.In the precoding design,according to the characteristics of different precoding,the central user adopted the maximum signal to leakage and noise ratio precoding,and the edge user adopted the minimum mean square error precoding,and the optimal solutions were obtained.In the design of power allocation,the Lagrange multiplier algorithm was used to obtain the optimal power allocation matrix in closed form.Simulation results show that the proposed algorithm is superior to the comparison literature algorithm in terms of bit error rate and energy efficiency,and effectively improves the overall performance of the system.

关 键 词：多小区MIMO 小区边缘 用户分类 预编码 功率分配 

分 类 号：TN92[电子电信—通信与信息系统]