面向多用户 MIMO 的模块化实用阵列供电 RIS 架构
摘要
我们提出一种具备良好电源和硬件效率、实用且模块化的多用户/多波束阵列供电 RIS 架构，特别适用于非常高频段（高毫米波和亚太赫兹），此类频段的信道在束空间中通常稀疏，且需保持准直线无阻塞 (LOS) 才能实现可接受的接收信号水平。关键模块为主动多天线供电器 (AMAF)，其在 RIS 远大量被动可控反射单元的近场区域布置少量主动天线。我们提出一种务实的方法，以获得高增益且副瓣极低的可导向束。通过叠加 K 个独立控制的 AMAF-RIS 模块，可实现 K 个相互独立的导束。我们的分析充分考虑：1) 模块之间的近端串扰 (NEXT)；2) 由于副瓣引起的远端串扰 (FEXT)；3) 就相同波束性能下的常规主动阵列而言，进行彻底的能源效率比较。总体而言，我们表明所提出的架构在频谱效率、实现便捷性（硬件复杂度）和能源效率方面均具备极佳吸引力。
引用
@article{arxiv.2405.00572,
title = {A Modular Pragmatic Architecture for Multiuser MIMO with Array-Fed RIS},
author = {Krishan Kumar Tiwari and Giuseppe Caire},
journal= {arXiv preprint arXiv:2405.00572},
year = {2024}
}
备注
5 pages, 8 figures, The 25th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) 2024, Lucca, Italy. This paper is a condensed version of our earlier work (arXiv:2311.18593), focusing specifically on the example of a 16x16 RIS fed by a 2x2 AMAF presented at SPAWC 2024. For a more comprehensive treatment, including log scale ground footprints, RIS phase heat maps, frequency selectivity analysis for broadband design, beam steering-based codebook design, zero forcing precoding, benchmark comparisons against optimum active arrays, multiple examples, and detailed power efficiency analysis, please refer to the full version in arXiv:2311.18593.