Beam space multiple‐input multiple‐output (B‐MIMO) systems operating at mmWave frequency in downlink uses different beam selection techniques for reducing the required number of radio frequency chains without apparent performance loss. In this paper, a joint beam selection and user association scheme with the objective of sum rate maximization is proposed. The proposed work on beam selection is based on a norm and uncorrrelation based approach, which considers channel correlation among the users so as to avoid inter‐user interference. Two different methods for beam user association with one modelled as a balanced assignment problem based on average sum assignment method and the other method that associates an optimal beam to every user by considering their channel gain values are also proposed along with beam selection. The proposed beam assignment methods are less complex and efficient in finding a suitable beam to every user within the cell. Simulation results show that the proposed method accomplish comparable performance in terms of sum rate and energy efficiency with appreciably low computational complexity relative to the existing methods in a correlated environment.

中文翻译：

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波束空间毫米波下行链路系统的联合波束选择和用户关联策略

在下行链路中以毫米波频率运行的波束空间多输入多输出（B‐MIMO）系统使用不同的波束选择技术来减少所需的射频链数量，而不会造成明显的性能损失。本文提出了一种以求和率最大化为目标的联合波束选择和用户关联方案。提议的波束选择工作基于基于规范和不相关性的方法，该方法考虑了用户之间的信道相关性，从而避免了用户之间的干扰。还提出了两种不同的波束用户关联方法，一种是基于平均和分配方法，一种被建模为平衡分配问题，另一种方法是通过考虑每个用户的信道增益值将最佳波束与每个用户相关联，以及波束选择。所提出的波束分配方法在为小区内的每个用户寻找合适的波束方面不太复杂且效率较高。仿真结果表明，与相关环境中的现有方法相比，该方法在求和率和能效方面具有可比的性能，并且计算复杂度相对较低。