The coupling between cell-free massive multiple-input multiple-output (MIMO) systems operating at millimeter-wave (mmWave) carrier frequencies and user mobility is considered in this paper. First of all, a mmWave channel is introduced taking into account the user mobility and the impact of the channel aging. Then, three beamforming techniques are proposed in the considered scenario, along with a dynamic user association technique (handover): starting from a user-centric association between each mobile device and a cluster of access points (APs), a rule for updating the APs cluster is formulated and analyzed. Numerical results reveal that the proposed beamforming and user association techniques are effective in the considered scenario.
翻译:本文考虑了在毫米波(mmWave)载体频率和用户流动性下运行的无细胞型大规模多投入多产出(MIIMO)系统之间的连接,首先,引入了考虑到用户流动性和频道老化影响的一个毫米Wave频道,然后,在考虑的假设情景中提出了三种波束成型技术,以及动态用户关联技术(交接):从每个移动设备之间以用户为中心的联系和一组接入点(APs)开始,制定并分析了更新APs集群的规则。数字结果显示,拟议的波形和用户关联技术在考虑的假设情景中是有效的。