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Joint User Association and Passive Beamforming in Heterogeneous Networks With Reconfigurable Intelligent Surfaces
IEEE Communications Letters ( IF 4.1 ) Pub Date : 2021-06-29 , DOI: 10.1109/lcomm.2021.3093362
Peibo Han , Zhengyi Zhou , Zhaocheng Wang

In this letter, the joint design of user association (UA) and passive beamforming (PBF) has been investigated for heterogeneous networks equipped with reconfigurable intelligent surfaces. Firstly, a closed-form lower bound of ergodic rate is derived using statistical channel state information and adopting the maximum ratio transmission precoding. After that, a joint UA and PBF problem is formulated to maximize the weighted sum-rate (WSR), which is then decomposed into UA and PBF subproblems and solved by our proposed priority-based swapping and fixed-point iteration algorithms. Simulation results demonstrate that our proposed scheme achieves significant WSR performance gain when compared to the state-of-the-art methods.

中文翻译:

具有可重构智能表面的异构网络中的联合用户关联和无源波束成形

在这封信中,针对配备可重构智能表面的异构网络,研究了用户关联 (UA) 和无源波束成形 (PBF) 的联合设计。首先,利用统计信道状态信息,采用最大比传输预编码,推导出一个封闭形式的遍历速率下界。之后,联合 UA 和 PBF 问题被制定以最大化加权和率 (WSR),然后将其分解为 UA 和 PBF 子问题,并通过我们提出的基于优先级的交换和定点迭代算法解决。仿真结果表明,与最先进的方法相比,我们提出的方案实现了显着的 WSR 性能提升。
更新日期:2021-06-29
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