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arXiv 2602.24018eess.SP
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无小区大规模MIMO网络的主辅助信道估计

Master-Assisted Channel Estimation for Cell-Free Massive MIMO Networks

KU Leuven(荷语鲁汶大学)

Andreas Angelou, Marc Moonen

AI总结:

针对无小区大规模MIMO网络,提出一种主辅助信道估计(MACE)方案,通过部分集中处理利用接入点间信号相关性,提升信道估计性能。

摘要:

无小区大规模多输入多输出(CFmMIMO)是第六代(6G)无线通信网络的关键使能技术,其中分布式接入点(AP)联合服务用户设备(UE)。在CFmMIMO网络常用的信道模型中,假设不存在AP间信道相关性,从而消除了集中处理的潜在优势。然而,通过精心设计导频传输阶段,AP在导频传输期间接收的信号可能变得相关,因此,尽管缺乏AP间信道相关性,集中化仍能提高信道估计性能。本文提出一种信道估计方案,称为主辅助信道估计(MACE),旨在通过部分集中处理利用AP间信号相关性,从而提高信道估计性能。在MACE中,一部分AP将其接收的导频信号融合并转发给主AP,然后主AP利用融合信号及其本地接收信号进行信道估计。该方案通过利用AP间信号相关性,在本地处理和完全集中处理之间取得平衡,同时减少前传信令和计算复杂度。数值实验表明,MACE始终优于忽略AP间信号相关性的本地信道估计。

英文摘要:

Cell-free massive-multiple-input-multiple-output (CFmMIMO) is a key enabler for sixth-generation (6G) wireless communication networks, where distributed access points (APs) jointly serve user equipments (UEs). In commonly adopted channel models for CFmMIMO networks, inter-AP channel correlation is assumed to be absent, thereby eliminating the potential benefits of centralized processing. However, by carefully designing the pilot transmission phase, the AP received signals during pilot transmission can become correlated, and thus, centralization can improve channel estimation performance, despite the absence of inter-AP channel correlation. In this paper, we propose a channel estimation scheme, termed master-assisted channel estimation (MACE), that aims to leverage inter-AP signal correlation by means of partially centralized processing and hence improve channel estimation performance. In MACE, a subset of APs fuse and forward their received pilot signals to a master AP, which then performs channel estimation using the fused signals together with its locally received signals. This scheme strikes a balance between local and fully centralized processing by leveraging inter-AP signal correlation, while reducing fronthaul signaling and computational complexity. Numerical experiments demonstrate that MACE consistently outperforms local channel estimation, where inter-AP signal correlation is neglected.

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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