MIMO系统中基于标量指标反馈的线性波束形成和用户调度  

Linear Beamforming and User Scheduling Based on Scalar Metric Feedback in MIMO Systems

作　　者：李健 陈少华[2] LI Jian;CHEN Shaohua(School of electrical information,Liaoning Railway Vocational and Technical College,Jinzhou Liaoning 121000,China;College of Automation and Electrical Engineering,Dalian Jiaotong University,Dalian Liaoning 116028,China)

机构地区：[1]辽宁铁道职业技术学院电气信息学院,辽宁锦州121000 [2]大连交通大学自动化与电气工程学院,辽宁大连116028

出　　处：《电子器件》2023年第4期943-950,共8页Chinese Journal of Electron Devices

基　　金：国家自然科学基金面上项目(61272527);辽宁省教育厅科学研究经费项目(LJKZ1299)。

摘　　要：为了实现多输入多输出(MIMO)系统中期望的和速率,提出了标量指标反馈的联合线性波束形成和用户调度方案。首先得到每个用户向发射机(基站)传递的反馈,它包括基于预先确定码本的信道方向信息和带有信道质量信息的标量指标,然后发射机利用这些反馈信息作为线性波束形成和执行用户调度;为了充分利用MIMO信道的多用户分集,对于反馈的标量指标,基于信号干扰加噪声比的通用形式设计了适用于不同情形的4种标量指标,并推导出了采用本设计方案的MIMO系统可以提供的遍历和速率的近似式;仿真实验结果表明,提出的方案不仅获得了期望的性能指标,而且相比于随机波束形成和时分多址技术,在大量用户数和低信噪比值下有更高的和速率。In order to achieve the desired sum rate in multiple input and multiple output(MIMO)systems,a joint linear beamforming and user scheduling scheme with scalar metric feedback is proposed.Firstly,the feedback transmitted by each user to the transmitter(base station)is obtained,which includes channel direction information based on pre-determined codebook and scalar metric with chan-nel quality information.Then,the transmitter uses the feedback information as linear beamforming and performs user scheduling.In or-der to make full use of the multi-user diversity in MIMO channel,for the feedback scalar metrics,four scalar metrics suitable for differ-ent situations are designed based on the general form of signal-to-interference-plus-noise ratio,and the approximate expression of ergodic sum rate that can be provided by the MIMO system using this design scheme is derived.Simulation results show that the proposed scheme not only achieves the desired performance metrics,but also has a higher sum rate under large number of users and low SNR compared with random beamforming and time division multiple access technique.

关 键 词：多输入多输出系统 多用户分集 波束形成 信道状态信息 信号干扰加噪声比 反馈 遍历和速率 

分 类 号：TN929.5[电子电信—通信与信息系统]