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arXiv 2409.03560eess.SP
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面向ELAA近场通信的动态混合波束成形设计

Dynamic Hybrid Beamforming Designs for ELAA Near-Field Communications

Mengzhen Liu, Ming Li, Rang Liu, Qian Liu

AI总结:

针对超大规模天线阵列近场通信中传统混合波束成形的脆弱性,提出动态混合波束成形架构,通过实时与双时间尺度设计优化和速率,仿真验证其有效性。

摘要:

超大规模天线阵列(ELAA)是第六代(6G)移动网络的关键候选技术。然而,在ELAA系统中使用大量天线传输高频信号会显著加剧近场效应。不幸的是,传统的混合波束成形方案极易受到ELAA近场通信的影响。为了有效缓解严重的近场效应,我们提出了一种适用于ELAA系统的新型动态混合波束成形架构,其中每根天线要么自适应地连接到一条射频(RF)链以进行信号传输,要么被停用以节省功率。对于每个信道相干时间内可获得瞬时信道状态信息(CSI)的情况,我们开发了一种实时动态混合波束成形设计,在移相器(PS)恒模、非重叠动态连接网络和总发射功率的约束下最大化可实现的和速率。当瞬时CSI难以实时获取时,我们提出了一种双时间尺度动态混合波束成形设计,该设计在长时间尺度上优化模拟波束成形器,在短时间尺度上优化数字波束成形器,目标是在相同约束下最大化遍历和速率。仿真结果证明了所提出的动态混合波束成形架构的优势以及所开发算法在ELAA近场通信中的有效性。

英文摘要:

Extremely large-scale antenna array (ELAA) is a key candidate technology for the sixth generation (6G) mobile networks. Nevertheless, using substantial numbers of antennas to transmit high-frequency signals in ELAA systems significantly exacerbates the near-field effect. Unfortunately, traditional hybrid beamforming schemes are highly vulnerable to ELAA near-field communications. To effectively mitigate severe near-field effect, we propose a novel dynamic hybrid beamforming architecture for ELAA systems, in which each antenna is either adaptively connected to one radio frequency (RF) chain for signal transmission or deactivated for power saving. For the case that instantaneous channel state information (CSI) is available during each channel coherence time, a real-time dynamic hybrid beamforming design is developed to maximize the achievable sum rate under the constraints of the constant modulus of phase-shifters (PSs), non-overlapping dynamic connection network and total transmit power. When instantaneous CSI cannot be easily obtained in real-time, we propose a two-timescale dynamic hybrid beamforming design, which optimizes analog beamformer in long-timescale and digital beamformer in short-timescale, with the goal of maximizing ergodic sum-rate under the same constraints. Simulation results demonstrate the advantages of the proposed dynamic hybrid beamforming architecture and the effectiveness of the developed algorithms for ELAA near-field communications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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