Article(id=1251535840388792837, tenantId=1146029695717560320, journalId=1251233871195320423, issueId=1251535833375912679, articleNumber=null, orderNo=null, doi=10.13190/j.jbupt.2024-129, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1718121600000, receivedDateStr=2024-06-12, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1776318996759, onlineDateStr=2026-04-16, pubDate=null, pubDateStr=null, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1776318996759, onlineIssueDateStr=2026-04-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1776318996759, creator=13701087609, updateTime=1776318996759, updator=13701087609, issue=Issue{id=1251535833375912679, tenantId=1146029695717560320, journalId=1251233871195320423, year='2025', volume='48', issue='5', pageStart='1', pageEnd='172', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1776318995087, creator=13701087609, updateTime=1776389324200, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1251830815148163525, tenantId=1146029695717560320, journalId=1251233871195320423, issueId=1251535833375912679, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1251830815148163526, tenantId=1146029695717560320, journalId=1251233871195320423, issueId=1251535833375912679, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=136, endPage=143, ext={EN=ArticleExt(id=1251535840657228300, articleId=1251535840388792837, tenantId=1146029695717560320, journalId=1251233871195320423, language=EN, title=Research on Cooperative User Selection and Beamforming Techniques in Distributed IRS Assisted MIMO Systems, columnId=1251535836207067917, journalTitle=Journal of Beijing University of Posts and Telecommunications, columnName=REPORTS, runingTitle=null, highlight=null, articleAbstract=
In the sixth generation (6G) mobile communication system, intelligent reflecting surfaces (IRS) enhance wireless transmission efficiency by dynamically adjusting the wireless propagation environment. In distributed IRS-assisted multiple-input multiple-output (MIMO) systems, when the number of users significantly exceeds the number of antennas at the base station (BS) , the joint optimization of user selection and beamforming is crucial for reducing BS transmission power and promoting green communication. To address this, a model is established with the objective of minimizing BS transmission power by jointly optimizing user selection, BS beamforming vectors, and phase shift matrices of distributed IRSs while ensuring user quality of service (QoS). To simplify the model, it is decoupled into two subproblems that are iteratively optimized to approximate the optimal solution of the original problem. First,the artificial bee colony(ABC)algorithm and second-order cone programming(SOCP)are employed to determine the optimal user selection strategy and BS beamforming vectors. Then,the phase shift matrices of the IRSs are optimized using the semidefinite relaxation(SDR)method. Simulation results demonstrate that the proposed algorithm not only achieves good convergence but also effectively reduces the transmission power of the BS.
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在第6代移动通信(6G)系统中,智能反射面(IRS)通过实时调整无线传输环境提高无线传输效率。在分布式IRS辅助多输入多输出(MIMO)系统中,当用户数量远大于基站(BS)的天线数量时,如何联合优化用户选择和波束赋形以降低BS的发送功率,对绿色通信发挥重要作用。为此,在满足用户服务质量的前提下,联合优化用户选择、BS波束赋形向量和分布式IRS的相移矩阵,以BS发送功率最小化为优化目标建立模型。为简化该模型,将其解耦成2个迭代的子问题,以逼近原问题的最优解。首先,利用人工蜂群(ABC)算法和2阶锥规划(SOCP)求解最优用户选择策略和BS波束赋形向量。然后,采用半正定松弛(SDR)方法优化IRSs的相移矩阵。仿真结果表明,所提算法不仅具有很好的收敛性,而且能有效降低BS的发射功率。
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