无线电通信技术2024，Vol.50Issue(2)：245-252,8.DOI:10.3969/j.issn.1003-3114.2024.02.004
RIS辅助去蜂窝大规模MIMO系统低复杂度预编码算法设计
Low Complexity Precoding Algorithm Design for RIS-aided Cell-free Massive MIMO Systems
摘要
Abstract
In this paper,we consider a Reconfigurable Intelligent Surface(RIS)-aided Cell-free massive Multiple-Input Multiple-Output(CF mMIMO)communication system,and propose a low-complexity precoding and RIS reflection phase shifts Alternating Opti-mization(AO)algorithm.In order to solve the problem that traditional Regularized Zero Forming(RZF)precoding algorithm is too complex,we propose a low-complexity RZF-CG precoding algorithm using the Conjugate Gradients(CG)method,which converts the in-verse matrix of RZF precoding into a linear equation system minimization problem,derives the residuals of the algorithm to update the search direction,and iteratively solves the inverse matrix.With the goal of maximizing the total spectral efficiency of the system user,we derive the RIS phase closed-form expression and then propose a low-complexity Projected Gradient Ascent(PGA)algorithm based on statistical channel state information.Simulation results show that the proposed AO algorithm can not only effectively improve system per-formance,but also reduce the algorithm complexity by about 73.2%.关键词
智能超表面/去蜂窝大规模多输入多输出通信系统/预编码/低复杂度Key words
RIS/CF mMIMO systems/precoding/low-complexity分类
信息技术与安全科学引用本文复制引用
胡亚婷,史恩宇,许柏恺,郑家康,章嘉懿,艾渤..RIS辅助去蜂窝大规模MIMO系统低复杂度预编码算法设计[J].无线电通信技术,2024,50(2):245-252,8.基金项目
国家自然科学基金(61971027) National Natural Science Foundation of China(61971027) （61971027）
