arXiv 2603.120142026-03-12eess.SP

以阵列几何为中心的近场多用户MIMO轴向旁瓣干扰分析

Array Geometry-Centric Axial Sidelobe Interference Analysis for Near-Field Multi-User MIMO

King Abdullah University of Science and Technology (KAUST)（阿卜杜拉国王科技大学）；University of Southampton（南安普顿大学）

Ahmed Hussain, Asmaa Abdallah, Abdulkadir Celik, Ahmed M. Eltawil

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AI总结：

本文提出基于阵列几何优化的近场多用户MIMO系统轴向旁瓣抑制方法，通过理论分析和仿真验证，证明均匀正方形阵列在旁瓣抑制和总速率性能上优于其他常见阵列结构。

摘要：

随着高频带大天线阵列的部署，未来无线通信系统可能在辐射近场（NF）中运行。不同于远场波束成形，近场波束可以在具有有限深度的空间区域中聚焦，使用户在距离和角度上都能进行复用。在近场多用户多输入多输出（MU-MIMO）系统中，可实现的速率受到轴向（距离）和横向（角度）维度中旁瓣干扰的限制。本文研究了轴向旁瓣（ASL）如何随阵列几何变化而变化。推导出闭合形式的阵列增益表达式，以表征均匀平面阵列的ASL。分析结果表明，均匀正方形阵列（USA）具有最低的ASL，其次是均匀同心圆阵列（UCCA）、均匀线性阵列（ULA）和均匀圆阵列（UCA）。具体而言，USA的峰值旁瓣水平（PSLL）为-17.6 dB，比UCA的-7.9 dB低。数值模拟证实，USA提供了更优的旁瓣抑制和最高总速率性能。

英文摘要：

With the deployment of large antenna arrays at high-frequency bands, future wireless communication systems are likely to operate in the radiative near-field (NF). Unlike far-field beam steering, NF beams can be focused on a spatial region with finite depth, enabling user multiplexing in both range and angle. In NF multiuser multiple-input multiple-output (MU-MIMO) systems, achievable rates are limited by interference arising from sidelobes in both the axial (range) and lateral (angle) dimensions. This work investigates how axial sidelobes (ASLs) vary with array geometry. Closed-form array gain expressions are derived to characterize ASLs for uniform planar arrays. Analytical results show that the uniform square array (USA) yields the lowest ASLs, followed by the uniform concentric circular array (UCCA), uniform linear array (ULA), and uniform circular array (UCA). Specifically, the USA achieves a peak sidelobe level (PSLL) of -17.6 dB versus -7.9 dB for the UCA. Numerical simulations confirm that the USA provides superior sidelobe suppression and highest sumrate performance.

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